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2 | |
2 | |
3 | gvpe.conf - configuration file for the GNU VPE daemon |
3 | gvpe.conf - configuration file for the GNU VPE daemon |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | enable-udp = yes |
7 | # global options for all nodes |
8 | udp-port = 407 |
8 | udp-port = 407 |
9 | mtu = 1492 |
9 | mtu = 1492 |
10 | ifname = vpn0 |
10 | ifname = vpn0 |
11 | |
11 | |
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12 | # first node is named branch1 and is at 1.2.3.4 |
12 | node = branch1 |
13 | node = branch1 |
13 | hostname = 1.2.3.4 |
14 | hostname = 1.2.3.4 |
14 | |
15 | |
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16 | # second node uses dns to resolve the address |
15 | node = branch2 |
17 | node = branch2 |
16 | hostname = www.example.net |
18 | hostname = www.example.net |
17 | udp-port = 500 # this host uses a different udp-port |
19 | udp-port = 500 # this host uses a different udp-port |
18 | |
20 | |
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21 | # third node has no fixed ip address |
19 | node = branch3 |
22 | node = branch3 |
20 | connect = ondemand |
23 | connect = ondemand |
21 | |
24 | |
22 | =head1 DESCRIPTION |
25 | =head1 DESCRIPTION |
23 | |
26 | |
24 | The gvpe config file consists of a series of lines that contain C<variable |
27 | The gvpe config file consists of a series of lines that contain C<variable |
25 | = value> pairs. Empty lines are ignored. Comments start with a C<#> and |
28 | = value> pairs. Empty lines are ignored. Comments start with a C<#> and |
26 | extend to the end of the line. They can be used on their own lines, or |
29 | extend to the end of the line. They can be used on their own lines, or |
27 | after any directives. Spaces are allowed before or after the C<=> sign or |
30 | after any directives. Whitespace is allowed around the C<=> sign or after |
28 | after values, but not within the variable names or values themselves. |
31 | values, but not within the variable names or values themselves. |
29 | |
32 | |
30 | The only exception to the above is the "on" directive that can prefix any |
33 | All settings are applied "in order", that is, later settings of the same |
31 | C<name = value> setting and will only "execute" it on the named node, or |
34 | variable overwrite earlier ones. |
32 | (if the nodename starts with "!") on all nodes except the named one. |
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33 | |
35 | |
34 | name = value |
36 | The only exceptions to the above are the "on" and "include" directives: |
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37 | |
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38 | =over 4 |
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39 | |
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40 | =item on nodename ... |
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41 | |
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42 | =item on !nodename ... |
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43 | |
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44 | You can prefix any configuration directive with C<on> and a nodename. GVPE |
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45 | will will only "execute" it on the named node, or (if the nodename starts |
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46 | with C<!>) on all nodes except the named one. |
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47 | |
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48 | Example: set the MTU to C<1450> everywhere, C<loglevel> to C<noise> on |
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49 | C<branch1>, and C<connect> to C<ondemand> everywhere but on branch2. |
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50 | |
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51 | mtu = 1450 |
35 | on branch1 loglevel = noise |
52 | on branch1 loglevel = noise |
36 | on !branch2 connect = ondemand |
53 | on !branch2 connect = ondemand |
37 | |
54 | |
38 | All settings are executed "in order", that is, later settings of the same |
55 | =item include relative-or-absolute-path |
39 | variable overwrite earlier ones. |
56 | |
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57 | Reads the specified file (the path must not contain whitespace or C<=> |
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58 | characters) and evaluate all config directives in it as if they were |
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59 | spelled out in place of the C<include> directive. |
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60 | |
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61 | The path is a printf format string, that is, you must escape any C<%> |
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62 | by doubling it, and you can have a single C<%s> inside, which will be |
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63 | replaced by the current nodename. |
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64 | |
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65 | Relative paths are interpreted relative to the GVPE config directory. |
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66 | |
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67 | Example: include the file F<local.conf> in the config directory on every |
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68 | node. |
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69 | |
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70 | include local.conf |
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71 | |
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72 | Example: include a file F<conf/>nodenameF<.conf> |
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73 | |
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74 | include conf/%s.conf |
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75 | |
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76 | =back |
40 | |
77 | |
41 | =head1 ANATOMY OF A CONFIG FILE |
78 | =head1 ANATOMY OF A CONFIG FILE |
42 | |
79 | |
43 | Usually, a config file starts with global settings (like the udp port to |
80 | Usually, a config file starts with a few global settings (like the UDP |
44 | listen on), followed by node-specific sections that begin with a C<node = |
81 | port to listen on), followed by node-specific sections that begin with a |
45 | nickname> line. |
82 | C<node = nickname> line. |
46 | |
83 | |
47 | Every node that is part of the network must have a section that starts |
84 | Every node that is part of the network must have a section that starts |
48 | with C<node = nickname>. The number and order of the nodes is important |
85 | with C<node = nickname>. The number and order of the nodes is important |
49 | and must be the same on all hosts. It is not uncommon for node sections to |
86 | and must be the same on all nodes. It is not uncommon for node sections to |
50 | be completely empty - if the default values are right. |
87 | be completely empty - if the default values are right. |
51 | |
88 | |
52 | Node-specific settings can be used at any time. If used before the first |
89 | Node-specific settings can be used at any time. If used before the first |
53 | node section they will set the default values for all following nodes. |
90 | node section they will set the default values for all following nodes. |
54 | |
91 | |
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61 | values on different nodes using C<on>), but will affect the behaviour of |
98 | values on different nodes using C<on>), but will affect the behaviour of |
62 | the gvpe daemon and all connections it creates. |
99 | the gvpe daemon and all connections it creates. |
63 | |
100 | |
64 | =over 4 |
101 | =over 4 |
65 | |
102 | |
66 | =item loglevel = noise|trace|debug|info|notice|warn|error|critical |
103 | =item dns-forw-host = hostname/ip |
67 | |
104 | |
68 | Set the logging level. Connection established messages are logged at level |
105 | The DNS server to forward DNS requests to for the DNS tunnel protocol |
69 | C<info>, notable errors are logged with C<error>. Default is C<info>. |
106 | (default: C<127.0.0.1>, changing it is highly recommended). |
70 | |
107 | |
71 | =item node = nickname |
108 | =item dns-forw-port = port-number |
72 | |
109 | |
73 | Not really a config setting but introduces a node section. The nickname is |
110 | The port where the C<dns-forw-host> is to be contacted (default: C<53>, |
74 | used to select the right configuration section and must be passed as an |
111 | which is fine in most cases). |
75 | argument to the gvpe daemon. |
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76 | |
112 | |
77 | =item private-key = relative-path-to-key |
113 | =item dns-case-preserving = yes|true|on | no|false|off |
78 | |
114 | |
79 | Sets the path (relative to the config directory) to the private key |
115 | Sets whether the DNS transport forwarding server preserves case (DNS |
80 | (default: C<hostkey>). This is a printf format string so every C<%> must |
116 | servers have to, but some access systems are even more broken than others) |
81 | be doubled. A single C<%s> is replaced by the hostname, so you could |
117 | (default: true). |
82 | use paths like C<hostkeys/%s> to fetch the files at the location where |
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83 | C<gvpectrl> puts them. |
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84 | |
118 | |
85 | Since only the private key file of the current node is used and the |
119 | Normally, when the forwarding server changes the case of domain names then |
86 | private key file should be kept secret per-host to avoid spoofings, it is |
120 | GVPE will automatically set this to false. |
87 | not recommended to use this feature. |
121 | |
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122 | =item dns-max-outstanding = integer-number-of-requests |
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123 | |
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124 | The maximum number of outstanding DNS transport requests |
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125 | (default: C<100>). GVPE will never issue more requests then the given |
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126 | limit without receiving replies. In heavily overloaded situations it might |
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127 | help to set this to a low number (e.g. C<3> or even C<1>) to limit the |
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128 | number of parallel requests. |
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129 | |
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130 | The default should be working OK for most links. |
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131 | |
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132 | =item dns-overlap-factor = float |
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133 | |
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134 | The DNS transport uses the minimum request latency (B<min_latency>) seen |
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135 | during a connection as it's timing base. This factor (default: C<0.5>, |
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136 | must be > 0) is multiplied by B<min_latency> to get the maximum sending |
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137 | rate (= minimum send interval), i.e. a factor of C<1> means that a new |
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138 | request might be generated every B<min_latency> seconds, which means on |
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139 | average there should only ever be one outstanding request. A factor of |
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140 | C<0.5> means that GVPE will send requests twice as often as the minimum |
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141 | latency measured. |
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142 | |
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143 | For congested or picky DNS forwarders you could use a value nearer to or |
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144 | exceeding C<1>. |
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145 | |
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146 | The default should be working OK for most links. |
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147 | |
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148 | =item dns-send-interval = send-interval-in-seconds |
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149 | |
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150 | The minimum send interval (= maximum rate) that the DNS transport will |
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151 | use to send new DNS requests. GVPE will not exceed this rate even when |
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152 | the latency is very low. The default is C<0.01>, which means GVPE will |
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153 | not send more than 100 DNS requests per connection per second. For |
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154 | high-bandwidth links you could go lower, e.g. to C<0.001> or so. For |
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155 | congested or rate-limited links, you might want to go higher, say C<0.1>, |
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156 | C<0.2> or even higher. |
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157 | |
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158 | The default should be working OK for most links. |
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159 | |
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160 | =item dns-timeout-factor = float |
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161 | |
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162 | Factor to multiply the C<min_latency> (see C<dns-overlap-factor>) by to |
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163 | get request timeouts. The default of C<8> means that the DNS transport |
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164 | will resend the request when no reply has been received for longer than |
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165 | eight times the minimum (= expected) latency, assuming the request or |
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166 | reply has been lost. |
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167 | |
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168 | For congested links a higher value might be necessary (e.g. C<30>). If |
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169 | the link is very stable lower values (e.g. C<2>) might work |
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170 | nicely. Values near or below C<1> makes no sense whatsoever. |
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171 | |
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172 | The default should be working OK for most links but will result in low |
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173 | throughput if packet loss is high. |
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174 | |
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175 | =item if-up = relative-or-absolute-path |
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176 | |
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177 | Sets the path of a script that should be called immediately after the |
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178 | network interface is initialized (but not necessarily up). The following |
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179 | environment variables are passed to it (the values are just examples). |
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180 | |
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181 | Variables that have the same value on all nodes: |
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182 | |
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183 | =over 4 |
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184 | |
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185 | =item CONFBASE=/etc/gvpe |
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186 | |
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187 | The configuration base directory. |
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188 | |
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189 | =item IFNAME=vpn0 |
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190 | |
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191 | The network interface to initialize. |
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192 | |
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193 | =item IFTYPE=native # or tincd |
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194 | |
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195 | =item IFSUBTYPE=linux # or freebsd, darwin etc.. |
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196 | |
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197 | The interface type (C<native> or C<tincd>) and the subtype (usually the |
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198 | OS name in lowercase) that this GVPE was configured for. Can be used to |
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199 | select the correct syntax to use for network-related commands. |
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200 | |
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201 | =item MTU=1436 |
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202 | |
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203 | The MTU to set the interface to. You can use lower values (if done |
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204 | consistently on all nodes), but this is usually either inefficient or |
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205 | simply ineffective. |
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206 | |
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207 | =item NODES=5 |
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208 | |
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209 | The number of nodes in this GVPE network. |
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210 | |
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211 | =back |
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212 | |
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213 | Variables that are node-specific and with values pertaining to the node |
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214 | running this GVPE: |
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215 | |
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216 | =over 4 |
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217 | |
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218 | =item IFUPDATA=string |
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219 | |
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220 | The value of the configuration directive C<if-up-data>. |
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221 | |
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222 | =item MAC=fe:fd:80:00:00:01 |
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223 | |
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224 | The MAC address the network interface has to use. |
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225 | |
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226 | Might be used to initialize interfaces on platforms where GVPE does not |
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227 | do this automatically. Please see the C<gvpe.osdep(5)> man page for |
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228 | platform-specific information. |
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229 | |
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230 | =item NODENAME=branch1 |
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231 | |
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232 | The nickname of the node. |
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233 | |
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234 | =item NODEID=1 |
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235 | |
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236 | The numerical node ID of the node running this instance of GVPE. The first |
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237 | node mentioned in the config file gets ID 1, the second ID 2 and so on. |
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238 | |
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239 | =back |
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240 | |
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241 | In addition, all node-specific variables (except C<NODEID>) will be |
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242 | available with a postfix of C<_nodeid>, which contains the value for that |
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243 | node, e.g. the C<MAC_1> variable contains the MAC address of node #1, while |
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244 | the C<NODENAME_22> variable contains the name of node #22. |
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245 | |
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246 | Here is a simple if-up script: |
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247 | |
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248 | #!/bin/sh |
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249 | ip link set $IFNAME up |
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250 | [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
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251 | [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
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252 | ip route add 10.0.0.0/8 dev $IFNAME |
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253 | |
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254 | More complicated examples (using routing to reduce ARP traffic) can be |
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255 | found in the F<etc/> subdirectory of the distribution. |
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256 | |
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257 | =item ifname = devname |
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258 | |
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259 | Sets the tun interface name to the given name. The default is OS-specific |
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260 | and most probably something like C<tun0>. |
88 | |
261 | |
89 | =item ifpersist = yes|true|on | no|false|off |
262 | =item ifpersist = yes|true|on | no|false|off |
90 | |
263 | |
91 | Should the tun/tap device be made persistent, that is, should the device |
264 | Should the tun/tap device be made persistent, that is, should the device |
92 | stay up even when gvpe exits? Some versions of the tunnel device have |
265 | stay up even when gvpe exits? Some versions of the tunnel device have |
93 | problems sending packets when gvpe is restarted in persistent mode, so |
266 | problems sending packets when gvpe is restarted in persistent mode, so |
94 | if the connections can be established but you cannot send packets from |
267 | if the connections can be established but you cannot send packets from |
95 | the local node, try to set this to C<off> and do an ifconfig down on the |
268 | the local node, try to set this to C<off> and do an ifconfig down on the |
96 | device. |
269 | device. |
97 | |
270 | |
98 | =item ifname = devname |
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99 | |
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100 | Sets the tun interface name to the given name. The default is OS-specific |
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101 | and most probably something like C<tun0>. |
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102 | |
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103 | =item rekey = seconds |
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104 | |
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105 | Sets the rekeying interval in seconds (default: C<3600>). Connections are |
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106 | reestablished every C<rekey> seconds. |
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107 | |
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108 | =item keepalive = seconds |
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109 | |
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110 | Sets the keepalive probe interval in seconds (default: C<60>). After this |
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111 | many seconds of inactivity the daemon will start to send keepalive probe |
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112 | every 5 seconds until it receives a reply from the other end. If no reply |
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113 | is received within 30 seconds, the peer is considered unreachable and the |
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114 | connection is closed. |
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115 | |
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116 | =item mtu = bytes |
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117 | |
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118 | Sets the maximum MTU that should be used on outgoing packets (basically |
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119 | the MTU of the outgoing interface) The daemon will automatically calculate |
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120 | maximum overhead (e.g. udp header size, encryption blocksize...) and pass |
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121 | this information to the C<if-up> script. |
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122 | |
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123 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
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124 | |
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125 | This value must be the minimum of the mtu values of all hosts. |
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126 | |
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127 | =item ip-proto = numerical-ip-protocol |
271 | =item ip-proto = numerical-ip-protocol |
128 | |
272 | |
129 | Sets the protocol number to be used for the rawip protocol. This is a |
273 | Sets the protocol number to be used for the rawip protocol. This is a |
130 | global option because all hosts must use the same protocol, and since |
274 | global option because all nodes must use the same protocol, and since |
131 | there are no port numbers, you cannot easily run more than one gvpe |
275 | there are no port numbers, you cannot easily run more than one gvpe |
132 | instance using the same protocol, nor can you share the protocol with |
276 | instance using the same protocol, nor can you share the protocol with |
133 | other programs. |
277 | other programs. |
134 | |
278 | |
135 | The default is 47 (GRE), which has a good chance of tunneling through |
279 | The default is 47 (GRE), which has a good chance of tunneling |
136 | firewalls (but note that the rawip protocol is not GRE compatible). Other |
280 | through firewalls (but note that gvpe's rawip protocol is not GRE |
137 | common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 (IPIP tunnels) or 98 |
281 | compatible). Other common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 |
138 | (ENCAP, rfc1241) |
282 | (IPIP tunnels) or 98 (ENCAP, rfc1241). |
139 | |
283 | |
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284 | Many versions of Linux seem to have a bug that causes them to reorder |
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285 | packets for some ip protocols (GRE, ESP) but not for others (AH), so |
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286 | choose wisely (that is, use 51, AH). |
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287 | |
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288 | =item http-proxy-host = hostname/ip |
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289 | |
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290 | The C<http-proxy-*> family of options are only available if gvpe was |
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291 | compiled with the C<--enable-http-proxy> option and enable tunneling of |
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292 | tcp connections through a http proxy server. |
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293 | |
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294 | C<http-proxy-host> and C<http-proxy-port> should specify the hostname and |
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295 | port number of the proxy server. See C<http-proxy-loginpw> if your proxy |
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296 | requires authentication. |
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297 | |
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298 | Please note that gvpe will still try to resolve all hostnames in the |
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299 | configuration file, so if you are behind a proxy without access to a DNS |
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300 | server better use numerical IP addresses. |
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301 | |
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302 | To make best use of this option disable all protocols except TCP in your |
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303 | config file and make sure your routers (or all other nodes) are listening |
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304 | on a port that the proxy allows (443, https, is a common choice). |
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305 | |
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306 | If you have a router, connecting to it will suffice. Otherwise TCP must be |
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307 | enabled on all nodes. |
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308 | |
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309 | Example: |
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310 | |
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311 | http-proxy-host = proxy.example.com |
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312 | http-proxy-port = 3128 # 8080 is another common choice |
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313 | http-proxy-auth = schmorp:grumbeere |
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314 | |
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315 | =item http-proxy-port = proxy-tcp-port |
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316 | |
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317 | The port where your proxy server listens. |
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318 | |
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319 | =item http-proxy-auth = login:password |
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320 | |
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321 | The optional login and password used to authenticate to the proxy server, |
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322 | separated by a literal colon (C<:>). Only basic authentication is |
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323 | currently supported. |
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324 | |
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325 | =item keepalive = seconds |
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326 | |
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327 | Sets the keepalive probe interval in seconds (default: C<60>). After this |
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328 | many seconds of inactivity the daemon will start to send keepalive probe |
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329 | every 3 seconds until it receives a reply from the other end. If no reply |
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330 | is received within 15 seconds, the peer is considered unreachable and the |
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331 | connection is closed. |
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332 | |
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333 | =item loglevel = noise|trace|debug|info|notice|warn|error|critical |
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334 | |
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335 | Set the logging level. Connection established messages are logged at level |
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336 | C<info>, notable errors are logged with C<error>. Default is C<info>. |
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337 | |
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338 | =item mtu = bytes |
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339 | |
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340 | Sets the maximum MTU that should be used on outgoing packets (basically |
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341 | the MTU of the outgoing interface) The daemon will automatically calculate |
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342 | maximum overhead (e.g. UDP header size, encryption blocksize...) and pass |
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343 | this information to the C<if-up> script. |
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344 | |
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345 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
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346 | |
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347 | This value must be the minimum of the MTU values of all nodes. |
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348 | |
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349 | =item node = nickname |
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350 | |
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351 | Not really a config setting but introduces a node section. The nickname is |
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352 | used to select the right configuration section and must be passed as an |
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353 | argument to the gvpe daemon. |
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354 | |
140 | =item if-up = relative-or-absolute-path |
355 | =item node-up = relative-or-absolute-path |
141 | |
356 | |
142 | Sets the path of a script that should be called immediately after the |
357 | Sets a command (default: none) that should be called whenever a connection |
143 | network interface is initialized (but not neccessarily up). The following |
358 | is established (even on rekeying operations). Note that node-up/down |
|
|
359 | scripts will be run asynchronously, but execution is serialised, so there |
|
|
360 | will only ever be one such script running. |
|
|
361 | |
|
|
362 | In addition to all the variables passed to C<if-up> scripts, the following |
144 | environment variables are passed to it (the values are just examples): |
363 | environment variables will be set (values are just examples): |
145 | |
364 | |
146 | =over 4 |
365 | =over 4 |
147 | |
366 | |
148 | =item CONFBASE=/etc/gvpe |
|
|
149 | |
|
|
150 | The configuration base directory. |
|
|
151 | |
|
|
152 | =item IFNAME=vpn0 |
|
|
153 | |
|
|
154 | The interface to initialize. |
|
|
155 | |
|
|
156 | =item MTU=1436 |
|
|
157 | |
|
|
158 | The MTU to set the interface to. You can use lower values (if done |
|
|
159 | consistently on all hosts), but this is usually ineffective. |
|
|
160 | |
|
|
161 | =item MAC=fe:fd:80:00:00:01 |
|
|
162 | |
|
|
163 | The MAC address to set the interface to. The script *must* set the |
|
|
164 | interface MAC to this value. You will most likely use one of these: |
|
|
165 | |
|
|
166 | ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux |
|
|
167 | ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD |
|
|
168 | |
|
|
169 | Please see the C<gvpe.osdep(5)> manpage for platform-specific information. |
|
|
170 | |
|
|
171 | =item IFTYPE=native # or tincd |
|
|
172 | |
|
|
173 | =item IFSUBTYPE=linux # or freebsd, darwin etc.. |
|
|
174 | |
|
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175 | The interface type (C<native> or C<tincd>) and the subtype (usually the os |
|
|
176 | name in lowercase) that this gvpe was configured for. Can be used to select |
|
|
177 | the correct syntax to use for network-related commands. |
|
|
178 | |
|
|
179 | =item NODENAME=branch1 |
367 | =item DESTNODE=branch2 |
180 | |
368 | |
181 | The nickname of the current node, as passed to the gvpe daemon. |
369 | The name of the remote node. |
182 | |
370 | |
183 | =item NODEID=1 |
371 | =item DESTID=2 |
184 | |
372 | |
185 | The numerical node id of the current node. The first node mentioned in the |
373 | The node id of the remote node. |
186 | config file gets ID 1, the second ID 2 and so on. |
374 | |
|
|
375 | =item DESTSI=rawip/88.99.77.55:0 |
|
|
376 | |
|
|
377 | The "socket info" of the target node, protocol dependent but usually in |
|
|
378 | the format protocol/ip:port. |
|
|
379 | |
|
|
380 | =item DESTIP=188.13.66.8 |
|
|
381 | |
|
|
382 | The numerical IP address of the remote node (gvpe accepts connections from |
|
|
383 | everywhere, as long as the other node can authenticate itself). |
|
|
384 | |
|
|
385 | =item DESTPORT=655 # deprecated |
|
|
386 | |
|
|
387 | The protocol port used by the other side, if applicable. |
|
|
388 | |
|
|
389 | =item STATE=up |
|
|
390 | |
|
|
391 | Node-up scripts get called with STATE=up, node-change scripts get called |
|
|
392 | with STATE=change and node-down scripts get called with STATE=down. |
187 | |
393 | |
188 | =back |
394 | =back |
189 | |
395 | |
190 | Here is a simple if-up script: |
|
|
191 | |
|
|
192 | #!/bin/sh |
|
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193 | ip link set $IFNAME address $MAC mtu $MTU up |
|
|
194 | [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
|
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195 | [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
|
|
196 | ip route add 10.0.0.0/8 dev $IFNAME |
|
|
197 | |
|
|
198 | More complicated examples (using routing to reduce arp traffic) can be |
|
|
199 | found in the etc/ subdirectory of the distribution. |
|
|
200 | |
|
|
201 | =item node-up = relative-or-absolute-path |
|
|
202 | |
|
|
203 | Sets a command (default: no script) that should be called whenever a |
|
|
204 | connection is established (even on rekeying operations). In addition |
|
|
205 | to the variables passed to C<if-up> scripts, the following environment |
|
|
206 | variables will be set: |
|
|
207 | |
|
|
208 | =over 4 |
|
|
209 | |
|
|
210 | =item DESTNODE=branch2 |
|
|
211 | |
|
|
212 | The name of the remote node. |
|
|
213 | |
|
|
214 | =item DESTID=2 |
|
|
215 | |
|
|
216 | The node id of the remote node. |
|
|
217 | |
|
|
218 | =item DESTIP=188.13.66.8 |
|
|
219 | |
|
|
220 | The numerical IP address of the remote host (gvpe accepts connections from |
|
|
221 | everywhere, as long as the other host can authenticate itself). |
|
|
222 | |
|
|
223 | =item DESTPORT=655 # deprecated |
|
|
224 | |
|
|
225 | The UDP port used by the other side. |
|
|
226 | |
|
|
227 | =item STATE=UP |
|
|
228 | |
|
|
229 | Node-up scripts get called with STATE=UP, node-down scripts get called |
|
|
230 | with STATE=DOWN. |
|
|
231 | |
|
|
232 | =back |
|
|
233 | |
|
|
234 | Here is a nontrivial example that uses nsupdate to update the name => ip |
396 | Here is a nontrivial example that uses nsupdate to update the name => ip |
235 | mapping in some dns zone: |
397 | mapping in some DNS zone: |
236 | |
398 | |
237 | #!/bin/sh |
399 | #!/bin/sh |
238 | { |
400 | { |
239 | echo update delete $DESTNODE.lowttl.example.net. a |
401 | echo update delete $DESTNODE.lowttl.example.net. a |
240 | echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
402 | echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
241 | echo |
403 | echo |
242 | } | nsupdate -d -k $CONFBASE:key.example.net. |
404 | } | nsupdate -d -k $CONFBASE:key.example.net. |
243 | |
405 | |
|
|
406 | =item node-change = relative-or-absolute-path |
|
|
407 | |
|
|
408 | Same as C<node-change>, but gets called whenever something about a |
|
|
409 | connection changes (such as the source IP address). |
|
|
410 | |
244 | =item node-down = relative-or-absolute-path |
411 | =item node-down = relative-or-absolute-path |
245 | |
412 | |
246 | Same as C<node-up>, but gets called whenever a connection is lost. |
413 | Same as C<node-up>, but gets called whenever a connection is lost. |
247 | |
414 | |
248 | =item http-proxy-host = hostname/ip |
|
|
249 | |
|
|
250 | The C<http-proxy-*> family of options are only available if gvpe was |
|
|
251 | compiled with the C<--enable-http-proxy> option and enable tunneling of |
|
|
252 | tcp connections through a http proxy server. |
|
|
253 | |
|
|
254 | C<http-proxy-host> and C<http-proxy-port> should specify the hostname and |
|
|
255 | port number of the proxy server. See C<http-proxy-loginpw> if your proxy |
|
|
256 | requires authentication. |
|
|
257 | |
|
|
258 | Please note that gvpe will still try to resolve all hostnames in the |
|
|
259 | configuration file, so if you are behind a proxy without access to a dns |
|
|
260 | server better use numerical IP addresses. |
|
|
261 | |
|
|
262 | To make best use of this option disable all protocols except tcp in your |
|
|
263 | config file and make sure your routers (or all other hosts) are listening |
|
|
264 | on a port that the proxy allows (443, https, is a common choice). |
|
|
265 | |
|
|
266 | If you have a router, connecting to it will suffice. Otherwise tcp must be |
|
|
267 | enabled on all hosts. |
|
|
268 | |
|
|
269 | Example: |
|
|
270 | |
|
|
271 | http-proxy-host = proxy.example.com |
|
|
272 | http-proxy-port = 3128 # 8080 is another common choice |
|
|
273 | http-proxy-auth = schmorp:grumbeere |
|
|
274 | |
|
|
275 | =item http-proxy-port = proxy-tcp-port |
|
|
276 | |
|
|
277 | The port where your proxy server listens. |
|
|
278 | |
|
|
279 | =item http-proxy-auth = login:password |
|
|
280 | |
|
|
281 | The optional login and password used to authenticate to the proxy server, |
|
|
282 | seperated by a literal colon (C<:>). Only basic authentication is |
|
|
283 | currently supported. |
|
|
284 | |
|
|
285 | =item pid-file = path |
415 | =item pid-file = path |
286 | |
416 | |
287 | The path to the pid file to check and create (Default: |
417 | The path to the pid file to check and create |
|
|
418 | (default: C<LOCALSTATEDIR/run/gvpe.pid>). |
|
|
419 | |
|
|
420 | =item private-key = relative-path-to-key |
|
|
421 | |
|
|
422 | Sets the path (relative to the config directory) to the private key |
|
|
423 | (default: C<hostkey>). This is a printf format string so every C<%> must |
|
|
424 | be doubled. A single C<%s> is replaced by the hostname, so you could |
|
|
425 | use paths like C<hostkeys/%s> to fetch the files at the location where |
|
|
426 | C<gvpectrl> puts them. |
|
|
427 | |
|
|
428 | Since only the private key file of the current node is used and the |
|
|
429 | private key file should be kept secret per-node to avoid spoofing, it is |
|
|
430 | not recommended to use this feature. |
|
|
431 | |
|
|
432 | =item rekey = seconds |
|
|
433 | |
|
|
434 | Sets the rekeying interval in seconds (default: C<3600>). Connections are |
|
|
435 | reestablished every C<rekey> seconds, making them use a new encryption |
|
|
436 | key. |
|
|
437 | |
|
|
438 | =item nfmark = integer |
|
|
439 | |
|
|
440 | This advanced option, when set to a nonzero value (default: C<0>), tries |
|
|
441 | to set the netfilter mark (or fwmark) value on all sockets gvpe uses to |
|
|
442 | send packets. |
|
|
443 | |
|
|
444 | This can be used to make gvpe use a different set of routing rules. For |
|
|
445 | example, on GNU/Linux, the C<if-up> could set C<nfmark> to 1000 and then |
|
|
446 | put all routing rules into table C<99> and then use an ip rule to make |
|
|
447 | gvpe traffic avoid that routing table, in effect routing normal traffic |
|
|
448 | via gvpe and gvpe traffic via the normal system routing tables: |
|
|
449 | |
|
|
450 | ip rule add not fwmark 1000 lookup 99 |
288 | |
451 | |
289 | =back |
452 | =back |
290 | |
453 | |
291 | =head2 NODE SPECIFIC SETTINGS |
454 | =head2 NODE SPECIFIC SETTINGS |
292 | |
455 | |
293 | The following settings are node-specific, that is, every node can have |
456 | The following settings are node-specific, that is, every node can have |
294 | different settings, even within the same gvpe instance. Settings that are |
457 | different settings, even within the same gvpe instance. Settings that are |
295 | executed before the first node section set the defaults, settings that are |
458 | set before the first node section set the defaults, settings that are |
296 | executed within a node section only apply to the given node. |
459 | set within a node section only apply to the given node. |
297 | |
460 | |
298 | =over 4 |
461 | =over 4 |
299 | |
462 | |
|
|
463 | =item allow-direct = nodename |
|
|
464 | |
|
|
465 | Allow direct connections to this node. See C<deny-direct> for more info. |
|
|
466 | |
|
|
467 | =item compress = yes|true|on | no|false|off |
|
|
468 | |
|
|
469 | For the current node, this specified whether it will accept compressed |
|
|
470 | packets, and for all other nodes, this specifies whether to try to |
|
|
471 | compress data packets sent to this node (default: C<yes>). Compression is |
|
|
472 | really cheap even on slow computers, has no size overhead at all and will |
|
|
473 | only be used when the other side supports compression, so enabling this is |
|
|
474 | often a good idea. |
|
|
475 | |
|
|
476 | =item connect = ondemand | never | always | disabled |
|
|
477 | |
|
|
478 | Sets the connect mode (default: C<always>). It can be C<always> (always |
|
|
479 | try to establish and keep a connection to the given node), C<never> |
|
|
480 | (never initiate a connection to the given host, but accept connections), |
|
|
481 | C<ondemand> (try to establish a connection when there are outstanding |
|
|
482 | packets in the queue and take it down after the keepalive interval) or |
|
|
483 | C<disabled> (node is bad, don't talk to it). |
|
|
484 | |
|
|
485 | Routers will automatically be forced to C<always> unless they are |
|
|
486 | C<disabled>, to ensure all nodes can talk to each other. |
|
|
487 | |
|
|
488 | =item deny-direct = nodename | * |
|
|
489 | |
|
|
490 | Deny direct connections to the specified node (or all nodes when C<*> |
|
|
491 | is given). Only one node can be specified, but you can use multiple |
|
|
492 | C<allow-direct> and C<deny-direct> statements. This only makes sense in |
|
|
493 | networks with routers, as routers are required for indirect connections. |
|
|
494 | |
|
|
495 | Sometimes, a node cannot reach some other nodes for reasons of network |
|
|
496 | connectivity. For example, a node behind a firewall that only allows |
|
|
497 | connections to/from a single other node in the network. In this case one |
|
|
498 | should specify C<deny-direct = *> and C<allow-direct = othernodename> (the other |
|
|
499 | node I<must> be a router for this to work). |
|
|
500 | |
|
|
501 | The algorithm to check whether a connection may be direct is as follows: |
|
|
502 | |
|
|
503 | 1. Other node mentioned in an C<allow-direct>? If yes, allow the connection. |
|
|
504 | |
|
|
505 | 2. Other node mentioned in a C<deny-direct>? If yes, deny direct connections. |
|
|
506 | |
|
|
507 | 3. Allow the connection. |
|
|
508 | |
|
|
509 | That is, C<allow-direct> takes precedence over C<deny-direct>. |
|
|
510 | |
|
|
511 | The check is done in both directions, i.e. both nodes must allow a direct |
|
|
512 | connection before one is attempted, so you only need to specify connect |
|
|
513 | limitations on one node. |
|
|
514 | |
|
|
515 | =item dns-domain = domain-suffix |
|
|
516 | |
|
|
517 | The DNS domain suffix that points to the DNS tunnel server for this node. |
|
|
518 | |
|
|
519 | The domain must point to a NS record that points to the I<dns-hostname>, |
|
|
520 | i.e. |
|
|
521 | |
|
|
522 | dns-domainname = tunnel.example.net |
|
|
523 | dns-hostname = tunnel-server.example.net |
|
|
524 | |
|
|
525 | Corresponds to the following DNS entries in the C<example.net> domain: |
|
|
526 | |
|
|
527 | tunnel.example.net. NS tunnel-server.example.net. |
|
|
528 | tunnel-server.example.net. A 13.13.13.13 |
|
|
529 | |
|
|
530 | =item dns-hostname = hostname/ip |
|
|
531 | |
|
|
532 | The address to bind the DNS tunnel socket to, similar to the C<hostname>, |
|
|
533 | but for the DNS tunnel protocol only. Default: C<0.0.0.0>, but that might |
|
|
534 | change. |
|
|
535 | |
300 | =item udp-port = port-number |
536 | =item dns-port = port-number |
301 | |
537 | |
302 | Sets the port number used by the UDP protocol (default: C<655>, not |
538 | The port to bind the DNS tunnel socket to. Must be C<53> on DNS tunnel servers. |
303 | officially assigned by IANA!). |
|
|
304 | |
539 | |
305 | =item tcp-port = port-number |
540 | =item enable-dns = yes|true|on | no|false|off |
306 | |
541 | |
307 | Similar to C<udp-port> (default: C<655>), but sets the TCP port number. |
542 | See gvpe.protocol(7) for a description of the DNS transport |
|
|
543 | protocol. Avoid this protocol if you can. |
|
|
544 | |
|
|
545 | Enable the DNS tunneling protocol on this node, either as server or as |
|
|
546 | client. Support for this transport protocol is only available when gvpe |
|
|
547 | was compiled using the C<--enable-dns> option. |
|
|
548 | |
|
|
549 | =item enable-icmp = yes|true|on | no|false|off |
|
|
550 | |
|
|
551 | See gvpe.protocol(7) for a description of the ICMP transport protocol. |
|
|
552 | |
|
|
553 | Enable the ICMP transport using ICMP packets of type C<icmp-type> on this |
|
|
554 | node. |
308 | |
555 | |
309 | =item enable-rawip = yes|true|on | no|false|off |
556 | =item enable-rawip = yes|true|on | no|false|off |
310 | |
557 | |
|
|
558 | See gvpe.protocol(7) for a description of the RAW IP transport protocol. |
|
|
559 | |
311 | Enable the RAW IPv4 transport using the C<ip-proto> protocol |
560 | Enable the RAW IPv4 transport using the C<ip-proto> protocol |
312 | (default: C<no>). This is the best choice, since the overhead per packet |
561 | (default: C<no>). |
313 | is only 38 bytes, as opposed to UDP's 58 (or TCP's 60+). |
562 | |
|
|
563 | =item enable-tcp = yes|true|on | no|false|off |
|
|
564 | |
|
|
565 | See gvpe.protocol(7) for a description of the TCP transport protocol. |
|
|
566 | |
|
|
567 | Enable the TCPv4 transport using the C<tcp-port> port |
|
|
568 | (default: C<no>). Support for this transport protocol is only available |
|
|
569 | when gvpe was compiled using the C<--enable-tcp> option. |
314 | |
570 | |
315 | =item enable-udp = yes|true|on | no|false|off |
571 | =item enable-udp = yes|true|on | no|false|off |
316 | |
572 | |
|
|
573 | See gvpe.protocol(7) for a description of the UDP transport protocol. |
|
|
574 | |
317 | Enable the UDPv4 transport using the C<udp-port> port (default: C<yes>, |
575 | Enable the UDPv4 transport using the C<udp-port> port (default: C<no>). |
318 | but this will change!). This is a good general choice since UDP tunnels |
|
|
319 | well through many firewalls. |
|
|
320 | |
576 | |
321 | NOTE: Please specify C<enable-udp = yes> even though it is the default, as |
577 | =item hostname = hostname | ip [can not be defaulted] |
322 | some future version will have all protocols disabled by default. |
|
|
323 | |
578 | |
324 | =item enable-tcp = yes|true|on | no|false|off |
579 | Forces the address of this node to be set to the given DNS hostname or IP |
|
|
580 | address. It will be resolved before each connect request, so dyndns should |
|
|
581 | work fine. If this setting is not specified and a router is available, |
|
|
582 | then the router will be queried for the address of this node. Otherwise, |
|
|
583 | the connection attempt will fail. |
325 | |
584 | |
326 | Enable the TCPv4 transport using the C<tcp-port> port |
585 | Note that DNS resolving is done synchronously, pausing the daemon. If that |
327 | (default: C<no>). Support for this horribly unsuitable protocol is only |
586 | is an issue you need to specify IP addresses. |
328 | available when gvpe was compiled using the C<--enable-tcp> option. Never |
|
|
329 | use this transport unless you really must, it is horribly ineffiecent and |
|
|
330 | resource-intensive compared to the other transports. |
|
|
331 | |
587 | |
332 | =item router-priority = positive-number |
588 | =item icmp-type = integer |
333 | |
589 | |
334 | Sets the router priority of the given host (default: C<0>, disabled). If |
590 | Sets the type value to be used for outgoing (and incoming) packets sent |
335 | some host tries to connect to another host without a hostname, it asks |
591 | via the ICMP transport. |
336 | the router host for it's IP address. The router host is the one with the |
|
|
337 | highest priority that is currently reachable. Make sure all clients always |
|
|
338 | connect to the router hosts, otherwise conencting to them is impossible. |
|
|
339 | |
592 | |
340 | =item connect = ondemand|never|always|disabled |
593 | The default is C<0> (which is C<echo-reply>, also known as |
|
|
594 | "ping-reply"). Other useful values include C<8> (C<echo-request>, a.k.a. |
|
|
595 | "ping") and C<11> (C<time-exceeded>), but any 8-bit value can be used. |
341 | |
596 | |
342 | Sets the connect mode (default: C<always>). It can be C<always> (always |
597 | =item if-up-data = value |
343 | try to establish and keep a conenction to the given host), C<never> |
598 | |
344 | (nevr initiate a connection to the given host, but accept connections), |
599 | The value specified using this directive will be passed to the C<if-up> |
345 | C<ondemand> (try to establish a connection on the first packet sent, and |
600 | script in the environment variable C<IFUPDATA>. |
346 | take it down after the keepalive interval) or C<disabled> (node is bad, |
|
|
347 | don't talk to it). |
|
|
348 | |
601 | |
349 | =item inherit-tos = yes|true|on | no|false|off |
602 | =item inherit-tos = yes|true|on | no|false|off |
350 | |
603 | |
351 | Wether to inherit the TOS settings of packets sent to the tunnel when |
604 | Whether to inherit the TOS settings of packets sent to the tunnel when |
352 | sending packets to this node (default: C<yes>). If set to C<yes> then |
605 | sending packets to this node (default: C<yes>). If set to C<yes> then |
353 | outgoing tunnel packets will have the same TOS setting as the packets sent |
606 | outgoing tunnel packets will have the same TOS setting as the packets sent |
354 | to the tunnel device, which is usually what you want. |
607 | to the tunnel device, which is usually what you want. |
355 | |
608 | |
356 | =item compress = yes|true|on | no|false|off |
|
|
357 | |
|
|
358 | Wether to compress data packets sent to this host (default: C<yes>). |
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359 | Compression is really cheap even on slow computers and has no size |
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360 | overhead at all, so enabling this is a good idea. |
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361 | |
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362 | =item max-retry = positive-number |
609 | =item max-retry = positive-number |
363 | |
610 | |
364 | The maximum interval in seconds (default: C<28800>, 8 hours) between |
611 | The maximum interval in seconds (default: C<3600>, one hour) between |
365 | retries to establish a connection to this node. When a connection cannot |
612 | retries to establish a connection to this node. When a connection cannot |
366 | be established, gvpe uses exponential backoff capped at this value. It's |
613 | be established, gvpe uses exponential back-off capped at this value. It's |
367 | sometimes useful to set this to a much lower value (e.g. C<120>) on |
614 | sometimes useful to set this to a much lower value (e.g. C<120>) on |
368 | connections to routers that usually are stable but sometimes are down, to |
615 | connections to routers that usually are stable but sometimes are down, to |
369 | assure quick reconnections. |
616 | assure quick reconnections even after longer downtimes. |
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617 | |
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618 | =item max-ttl = seconds |
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619 | |
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620 | Expire packets that couldn't be sent after this many seconds |
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621 | (default: C<60>). Gvpe will normally queue packets for a node without an |
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622 | active connection, in the hope of establishing a connection soon. This |
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623 | value specifies the maximum lifetime a packet will stay in the queue, if a |
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624 | packet gets older, it will be thrown away. |
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625 | |
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626 | =item max-queue = positive-number>=1 |
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627 | |
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628 | The maximum number of packets that will be queued (default: C<512>) |
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629 | for this node. If more packets are sent then earlier packets will be |
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630 | expired. See C<max-ttl>, above. |
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631 | |
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632 | =item router-priority = 0 | 1 | positive-number>=2 |
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633 | |
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634 | Sets the router priority of the given node (default: C<0>, disabled). |
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635 | |
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636 | If some node tries to connect to another node but it doesn't have a |
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637 | hostname, it asks a router node for it's IP address. The router node |
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638 | chosen is the one with the highest priority larger than C<1> that is |
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639 | currently reachable. This is called a I<mediated> connection, as the |
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640 | connection itself will still be direct, but it uses another node to |
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641 | mediate between the two nodes. |
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642 | |
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643 | The value C<0> disables routing, that means if the node receives a packet |
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644 | not for itself it will not forward it but instead drop it. |
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645 | |
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646 | The special value C<1> allows other hosts to route through the router |
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647 | host, but they will never route through it by default (i.e. the config |
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648 | file of another node needs to specify a router priority higher than one |
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649 | to choose such a node for routing). |
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650 | |
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651 | The idea behind this is that some hosts can, if required, bump the |
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652 | C<router-priority> setting to higher than C<1> in their local config to |
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653 | route through specific hosts. If C<router-priority> is C<0>, then routing |
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654 | will be refused, so C<1> serves as a "enable, but do not use by default" |
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655 | switch. |
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656 | |
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657 | Nodes with C<router-priority> set to C<2> or higher will always be forced |
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658 | to C<connect> = C<always> (unless they are C<disabled>). |
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659 | |
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|
660 | =item tcp-port = port-number |
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661 | |
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662 | Similar to C<udp-port> (default: C<655>), but sets the TCP port number. |
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663 | |
|
|
664 | =item udp-port = port-number |
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665 | |
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666 | Sets the port number used by the UDP protocol (default: C<655>, not |
|
|
667 | officially assigned by IANA!). |
370 | |
668 | |
371 | =back |
669 | =back |
372 | |
670 | |
373 | =head1 CONFIG DIRECTORY LAYOUT |
671 | =head1 CONFIG DIRECTORY LAYOUT |
374 | |
672 | |
… | |
… | |
402 | |
700 | |
403 | gvpe(5), gvpe(8), gvpectrl(8). |
701 | gvpe(5), gvpe(8), gvpectrl(8). |
404 | |
702 | |
405 | =head1 AUTHOR |
703 | =head1 AUTHOR |
406 | |
704 | |
407 | Marc Lehmann <gvpe@plan9.de> |
705 | Marc Lehmann <gvpe@schmorp.de> |
408 | |
706 | |