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