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| 132 | .\" ======================================================================== |
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| 133 | .\" |
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| 134 | .IX Title "GVPE.CONF 5" |
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| 135 | .TH GVPE.CONF 5 "2009-03-23" "2.22" "GNU Virtual Private Ethernet" |
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| 136 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
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| 137 | .\" way too many mistakes in technical documents. |
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| 138 | .if n .ad l |
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| 139 | .nh |
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| 140 | .SH "NAME" |
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| 141 | gvpe.conf \- configuration file for the GNU VPE daemon |
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| 142 | .SH "SYNOPSIS" |
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| 143 | .IX Header "SYNOPSIS" |
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| 144 | .Vb 4 |
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| 145 | \& # global options for all nodes |
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| 146 | \& udp\-port = 407 |
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| 147 | \& mtu = 1492 |
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| 148 | \& ifname = vpn0 |
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| 149 | \& |
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| 150 | \& # first node is named branch1 and is at 1.2.3.4 |
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| 151 | \& node = branch1 |
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| 152 | \& hostname = 1.2.3.4 |
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| 153 | \& |
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| 154 | \& # second node uses dns to resolve the address |
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| 155 | \& node = branch2 |
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| 156 | \& hostname = www.example.net |
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| 157 | \& udp\-port = 500 # this host uses a different udp\-port |
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| 158 | \& |
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| 159 | \& # third node has no fixed ip address |
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| 160 | \& node = branch3 |
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| 161 | \& connect = ondemand |
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| 162 | .Ve |
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| 163 | .SH "DESCRIPTION" |
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| 164 | .IX Header "DESCRIPTION" |
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| 165 | The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable |
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| 166 | = value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR and |
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| 167 | extend to the end of the line. They can be used on their own lines, or |
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| 168 | after any directives. Whitespace is allowed around the \f(CW\*(C`=\*(C'\fR sign or after |
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| 169 | values, but not within the variable names or values themselves. |
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| 170 | .PP |
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| 171 | The only exception to the above is the \*(L"on\*(R" directive that can prefix any |
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| 172 | \&\f(CW\*(C`name = value\*(C'\fR setting and will only \*(L"execute\*(R" it on the named node, or |
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| 173 | (if the nodename starts with \*(L"!\*(R") on all nodes except the named one. |
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| 174 | .PP |
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| 175 | For example, set the \s-1MTU\s0 to \f(CW1450\fR everywhere, loglevel to \f(CW\*(C`noise\*(C'\fR on |
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| 176 | branch1, and connect to \f(CW\*(C`ondemand\*(C'\fR everywhere but on branch2: |
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| 177 | .PP |
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| 178 | .Vb 3 |
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| 179 | \& mtu = 1450 |
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| 180 | \& on branch1 loglevel = noise |
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| 181 | \& on !branch2 connect = ondemand |
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| 182 | .Ve |
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| 183 | .PP |
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| 184 | All settings are applied \*(L"in order\*(R", that is, later settings of the same |
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| 185 | variable overwrite earlier ones. |
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| 186 | .SH "ANATOMY OF A CONFIG FILE" |
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| 187 | .IX Header "ANATOMY OF A CONFIG FILE" |
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| 188 | Usually, a config file starts with a few global settings (like the \s-1UDP\s0 |
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| 189 | port to listen on), followed by node-specific sections that begin with a |
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| 190 | \&\f(CW\*(C`node = nickname\*(C'\fR line. |
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| 191 | .PP |
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| 192 | Every node that is part of the network must have a section that starts |
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| 193 | with \f(CW\*(C`node = nickname\*(C'\fR. The number and order of the nodes is important |
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| 194 | and must be the same on all nodes. It is not uncommon for node sections to |
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| 195 | be completely empty \- if the default values are right. |
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| 196 | .PP |
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| 197 | Node-specific settings can be used at any time. If used before the first |
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| 198 | node section they will set the default values for all following nodes. |
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| 199 | .SH "CONFIG VARIABLES" |
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| 200 | .IX Header "CONFIG VARIABLES" |
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| 201 | .Sh "\s-1GLOBAL\s0 \s-1SETTINGS\s0" |
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| 202 | .IX Subsection "GLOBAL SETTINGS" |
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| 203 | Global settings will affect the behaviour of the running gvpe daemon, that |
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| 204 | is, they are in some sense node-specific (config files can set different |
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| 205 | values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of |
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| 206 | the gvpe daemon and all connections it creates. |
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| 207 | .IP "dns-forw-host = hostname/ip" 4 |
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| 208 | .IX Item "dns-forw-host = hostname/ip" |
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| 209 | The \s-1DNS\s0 server to forward \s-1DNS\s0 requests to for the \s-1DNS\s0 tunnel protocol |
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| 210 | (default: \f(CW127.0.0.1\fR, changing it is highly recommended). |
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| 211 | .IP "dns-forw-port = port-number" 4 |
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| 212 | .IX Item "dns-forw-port = port-number" |
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| 213 | The port where the \f(CW\*(C`dns\-forw\-host\*(C'\fR is to be contacted (default: \f(CW53\fR, |
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| 214 | which is fine in most cases). |
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| 215 | .IP "dns-max-outstanding = integer-number-of-requests" 4 |
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| 216 | .IX Item "dns-max-outstanding = integer-number-of-requests" |
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| 217 | The maximum number of outstanding \s-1DNS\s0 transport requests |
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| 218 | (default: \f(CW100\fR). \s-1GVPE\s0 will never issue more requests then the given |
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| 219 | limit without receiving replies. In heavily overloaded situations it might |
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| 220 | help to set this to a low number (e.g. \f(CW3\fR or even \f(CW1\fR) to limit the |
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| 221 | number of parallel requests. |
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| 222 | .Sp |
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| 223 | The default should be working \s-1OK\s0 for most links. |
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| 224 | .IP "dns-overlap-factor = float" 4 |
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| 225 | .IX Item "dns-overlap-factor = float" |
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| 226 | The \s-1DNS\s0 transport uses the minimum request latency (\fBmin_latency\fR) seen |
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| 227 | during a connection as it's timing base. This factor (default: \f(CW0.5\fR, |
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| 228 | must be > 0) is multiplied by \fBmin_latency\fR to get the maximum sending |
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| 229 | rate (= minimum send interval), i.e. a factor of \f(CW1\fR means that a new |
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| 230 | request might be generated every \fBmin_latency\fR seconds, which means on |
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| 231 | average there should only ever be one outstanding request. A factor of |
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| 232 | \&\f(CW0.5\fR means that \s-1GVPE\s0 will send requests twice as often as the minimum |
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| 233 | latency measured. |
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| 234 | .Sp |
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| 235 | For congested or picky \s-1DNS\s0 forwarders you could use a value nearer to or |
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| 236 | exceeding \f(CW1\fR. |
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| 237 | .Sp |
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| 238 | The default should be working \s-1OK\s0 for most links. |
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| 239 | .IP "dns-send-interval = send-interval-in-seconds" 4 |
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| 240 | .IX Item "dns-send-interval = send-interval-in-seconds" |
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| 241 | The minimum send interval (= maximum rate) that the \s-1DNS\s0 transport will |
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| 242 | use to send new \s-1DNS\s0 requests. \s-1GVPE\s0 will not exceed this rate even when |
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| 243 | the latency is very low. The default is \f(CW0.01\fR, which means \s-1GVPE\s0 will |
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| 244 | not send more than 100 \s-1DNS\s0 requests per connection per second. For |
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| 245 | high-bandwidth links you could go lower, e.g. to \f(CW0.001\fR or so. For |
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| 246 | congested or rate-limited links, you might want to go higher, say \f(CW0.1\fR, |
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| 247 | \&\f(CW0.2\fR or even higher. |
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| 248 | .Sp |
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| 249 | The default should be working \s-1OK\s0 for most links. |
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| 250 | .IP "dns-timeout-factor = float" 4 |
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| 251 | .IX Item "dns-timeout-factor = float" |
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| 252 | Factor to multiply the \f(CW\*(C`min_latency\*(C'\fR (see \f(CW\*(C`dns\-overlap\-factor\*(C'\fR) by to |
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| 253 | get request timeouts. The default of \f(CW8\fR means that the \s-1DNS\s0 transport |
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| 254 | will resend the request when no reply has been received for longer than |
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| 255 | eight times the minimum (= expected) latency, assuming the request or |
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| 256 | reply has been lost. |
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| 257 | .Sp |
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| 258 | For congested links a higher value might be necessary (e.g. \f(CW30\fR). If |
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| 259 | the link is very stable lower values (e.g. \f(CW2\fR) might work |
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| 260 | nicely. Values near or below \f(CW1\fR makes no sense whatsoever. |
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| 261 | .Sp |
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| 262 | The default should be working \s-1OK\s0 for most links but will result in low |
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| 263 | throughput if packet loss is high. |
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| 264 | .IP "if-up = relative-or-absolute-path" 4 |
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| 265 | .IX Item "if-up = relative-or-absolute-path" |
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| 266 | Sets the path of a script that should be called immediately after the |
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| 267 | network interface is initialized (but not necessarily up). The following |
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| 268 | environment variables are passed to it (the values are just examples). |
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| 269 | .Sp |
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| 270 | Variables that have the same value on all nodes: |
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| 271 | .RS 4 |
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| 272 | .IP "CONFBASE=/etc/gvpe" 4 |
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| 273 | .IX Item "CONFBASE=/etc/gvpe" |
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| 274 | The configuration base directory. |
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| 275 | .IP "IFNAME=vpn0" 4 |
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| 276 | .IX Item "IFNAME=vpn0" |
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| 277 | The network interface to initialize. |
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| 278 | .IP "IFTYPE=native # or tincd" 4 |
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| 279 | .IX Item "IFTYPE=native # or tincd" |
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| 280 | .PD 0 |
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| 281 | .IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4 |
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| 282 | .IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.." |
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| 283 | .PD |
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| 284 | The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the |
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| 285 | \&\s-1OS\s0 name in lowercase) that this \s-1GVPE\s0 was configured for. Can be used to |
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| 286 | select the correct syntax to use for network-related commands. |
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| 287 | .IP "MTU=1436" 4 |
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| 288 | .IX Item "MTU=1436" |
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| 289 | The \s-1MTU\s0 to set the interface to. You can use lower values (if done |
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| 290 | consistently on all nodes), but this is usually either inefficient or |
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| 291 | simply ineffective. |
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| 292 | .IP "NODES=5" 4 |
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| 293 | .IX Item "NODES=5" |
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| 294 | The number of nodes in this \s-1GVPE\s0 network. |
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| 295 | .RE |
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| 296 | .RS 4 |
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| 297 | .Sp |
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| 298 | Variables that are node-specific and with values pertaining to the node |
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| 299 | running this \s-1GVPE:\s0 |
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| 300 | .IP "IFUPDATA=string" 4 |
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| 301 | .IX Item "IFUPDATA=string" |
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| 302 | The value of the configuration directive \f(CW\*(C`if\-up\-data\*(C'\fR. |
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| 303 | .IP "MAC=fe:fd:80:00:00:01" 4 |
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| 304 | .IX Item "MAC=fe:fd:80:00:00:01" |
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| 305 | The \s-1MAC\s0 address the network interface has to use. |
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| 306 | .Sp |
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| 307 | Might be used to initialize interfaces on platforms where \s-1GVPE\s0 does not |
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| 308 | do this automatically. Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR man page for |
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| 309 | platform-specific information. |
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| 310 | .IP "NODENAME=branch1" 4 |
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| 311 | .IX Item "NODENAME=branch1" |
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| 312 | The nickname of the node. |
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| 313 | .IP "NODEID=1" 4 |
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| 314 | .IX Item "NODEID=1" |
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| 315 | The numerical node \s-1ID\s0 of the node running this instance of \s-1GVPE\s0. The first |
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| 316 | node mentioned in the config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on. |
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| 317 | .RE |
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| 318 | .RS 4 |
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| 319 | .Sp |
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| 320 | In addition, all node-specific variables (except \f(CW\*(C`NODEID\*(C'\fR) will be |
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| 321 | available with a postfix of \f(CW\*(C`_nodeid\*(C'\fR, which contains the value for that |
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| 322 | node, e.g. the \f(CW\*(C`MAC_1\*(C'\fR variable contains the \s-1MAC\s0 address of node #1, while |
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| 323 | the \f(CW\*(C`NODENAME_22\*(C'\fR variable contains the name of node #22. |
|
|
| 324 | .Sp |
|
|
| 325 | Here is a simple if-up script: |
|
|
| 326 | .Sp |
|
|
| 327 | .Vb 5 |
|
|
| 328 | \& #!/bin/sh |
|
|
| 329 | \& ip link set $IFNAME up |
|
|
| 330 | \& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
|
|
| 331 | \& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
|
|
| 332 | \& ip route add 10.0.0.0/8 dev $IFNAME |
|
|
| 333 | .Ve |
|
|
| 334 | .Sp |
|
|
| 335 | More complicated examples (using routing to reduce \s-1ARP\s0 traffic) can be |
|
|
| 336 | found in the \fIetc/\fR subdirectory of the distribution. |
|
|
| 337 | .RE |
|
|
| 338 | .IP "ifname = devname" 4 |
|
|
| 339 | .IX Item "ifname = devname" |
|
|
| 340 | Sets the tun interface name to the given name. The default is OS-specific |
|
|
| 341 | and most probably something like \f(CW\*(C`tun0\*(C'\fR. |
|
|
| 342 | .IP "ifpersist = yes|true|on | no|false|off" 4 |
|
|
| 343 | .IX Item "ifpersist = yes|true|on | no|false|off" |
|
|
| 344 | Should the tun/tap device be made persistent, that is, should the device |
|
|
| 345 | stay up even when gvpe exits? Some versions of the tunnel device have |
|
|
| 346 | problems sending packets when gvpe is restarted in persistent mode, so |
|
|
| 347 | if the connections can be established but you cannot send packets from |
|
|
| 348 | the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the |
|
|
| 349 | device. |
|
|
| 350 | .IP "ip-proto = numerical-ip-protocol" 4 |
|
|
| 351 | .IX Item "ip-proto = numerical-ip-protocol" |
|
|
| 352 | Sets the protocol number to be used for the rawip protocol. This is a |
|
|
| 353 | global option because all nodes must use the same protocol, and since |
|
|
| 354 | there are no port numbers, you cannot easily run more than one gvpe |
|
|
| 355 | instance using the same protocol, nor can you share the protocol with |
|
|
| 356 | other programs. |
|
|
| 357 | .Sp |
|
|
| 358 | The default is 47 (\s-1GRE\s0), which has a good chance of tunneling |
|
|
| 359 | through firewalls (but note that gvpe's rawip protocol is not \s-1GRE\s0 |
|
|
| 360 | compatible). Other common choices are 50 (\s-1IPSEC\s0, \s-1ESP\s0), 51 (\s-1IPSEC\s0, \s-1AH\s0), 4 |
|
|
| 361 | (\s-1IPIP\s0 tunnels) or 98 (\s-1ENCAP\s0, rfc1241) |
|
|
| 362 | .IP "http-proxy-host = hostname/ip" 4 |
|
|
| 363 | .IX Item "http-proxy-host = hostname/ip" |
|
|
| 364 | The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was |
|
|
| 365 | compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of |
|
|
| 366 | tcp connections through a http proxy server. |
|
|
| 367 | .Sp |
|
|
| 368 | \&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and |
|
|
| 369 | port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy |
|
|
| 370 | requires authentication. |
|
|
| 371 | .Sp |
|
|
| 372 | Please note that gvpe will still try to resolve all hostnames in the |
|
|
| 373 | configuration file, so if you are behind a proxy without access to a \s-1DNS\s0 |
|
|
| 374 | server better use numerical \s-1IP\s0 addresses. |
|
|
| 375 | .Sp |
|
|
| 376 | To make best use of this option disable all protocols except \s-1TCP\s0 in your |
|
|
| 377 | config file and make sure your routers (or all other nodes) are listening |
|
|
| 378 | on a port that the proxy allows (443, https, is a common choice). |
|
|
| 379 | .Sp |
|
|
| 380 | If you have a router, connecting to it will suffice. Otherwise \s-1TCP\s0 must be |
|
|
| 381 | enabled on all nodes. |
|
|
| 382 | .Sp |
|
|
| 383 | Example: |
|
|
| 384 | .Sp |
|
|
| 385 | .Vb 3 |
|
|
| 386 | \& http\-proxy\-host = proxy.example.com |
|
|
| 387 | \& http\-proxy\-port = 3128 # 8080 is another common choice |
|
|
| 388 | \& http\-proxy\-auth = schmorp:grumbeere |
|
|
| 389 | .Ve |
|
|
| 390 | .IP "http-proxy-port = proxy-tcp-port" 4 |
|
|
| 391 | .IX Item "http-proxy-port = proxy-tcp-port" |
|
|
| 392 | The port where your proxy server listens. |
|
|
| 393 | .IP "http-proxy-auth = login:password" 4 |
|
|
| 394 | .IX Item "http-proxy-auth = login:password" |
|
|
| 395 | The optional login and password used to authenticate to the proxy server, |
|
|
| 396 | separated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is |
|
|
| 397 | currently supported. |
|
|
| 398 | .IP "keepalive = seconds" 4 |
|
|
| 399 | .IX Item "keepalive = seconds" |
|
|
| 400 | Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this |
|
|
| 401 | many seconds of inactivity the daemon will start to send keepalive probe |
|
|
| 402 | every 3 seconds until it receives a reply from the other end. If no reply |
|
|
| 403 | is received within 15 seconds, the peer is considered unreachable and the |
|
|
| 404 | connection is closed. |
|
|
| 405 | .IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4 |
|
|
| 406 | .IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical" |
|
|
| 407 | Set the logging level. Connection established messages are logged at level |
|
|
| 408 | \&\f(CW\*(C`info\*(C'\fR, notable errors are logged with \f(CW\*(C`error\*(C'\fR. Default is \f(CW\*(C`info\*(C'\fR. |
|
|
| 409 | .IP "mtu = bytes" 4 |
|
|
| 410 | .IX Item "mtu = bytes" |
|
|
| 411 | Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically |
|
|
| 412 | the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate |
|
|
| 413 | maximum overhead (e.g. \s-1UDP\s0 header size, encryption blocksize...) and pass |
|
|
| 414 | this information to the \f(CW\*(C`if\-up\*(C'\fR script. |
|
|
| 415 | .Sp |
|
|
| 416 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
|
|
| 417 | .Sp |
|
|
| 418 | This value must be the minimum of the \s-1MTU\s0 values of all nodes. |
|
|
| 419 | .IP "node = nickname" 4 |
|
|
| 420 | .IX Item "node = nickname" |
|
|
| 421 | Not really a config setting but introduces a node section. The nickname is |
|
|
| 422 | used to select the right configuration section and must be passed as an |
|
|
| 423 | argument to the gvpe daemon. |
|
|
| 424 | .IP "node-up = relative-or-absolute-path" 4 |
|
|
| 425 | .IX Item "node-up = relative-or-absolute-path" |
|
|
| 426 | Sets a command (default: none) that should be called whenever a connection |
|
|
| 427 | is established (even on rekeying operations). Note that node\-up/down |
|
|
| 428 | scripts will be run asynchronously, but execution is serialised, so there |
|
|
| 429 | will only ever be one such script running. |
|
|
| 430 | .Sp |
|
|
| 431 | In addition to all the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following |
|
|
| 432 | environment variables will be set: |
|
|
| 433 | .RS 4 |
|
|
| 434 | .IP "DESTNODE=branch2" 4 |
|
|
| 435 | .IX Item "DESTNODE=branch2" |
|
|
| 436 | The name of the remote node. |
|
|
| 437 | .IP "DESTID=2" 4 |
|
|
| 438 | .IX Item "DESTID=2" |
|
|
| 439 | The node id of the remote node. |
|
|
| 440 | .IP "DESTIP=188.13.66.8" 4 |
|
|
| 441 | .IX Item "DESTIP=188.13.66.8" |
|
|
| 442 | The numerical \s-1IP\s0 address of the remote node (gvpe accepts connections from |
|
|
| 443 | everywhere, as long as the other node can authenticate itself). |
|
|
| 444 | .IP "DESTPORT=655 # deprecated" 4 |
|
|
| 445 | .IX Item "DESTPORT=655 # deprecated" |
|
|
| 446 | The \s-1UDP\s0 port used by the other side. |
|
|
| 447 | .IP "STATE=UP" 4 |
|
|
| 448 | .IX Item "STATE=UP" |
|
|
| 449 | Node-up scripts get called with STATE=UP, node-down scripts get called |
|
|
| 450 | with STATE=DOWN. |
|
|
| 451 | .RE |
|
|
| 452 | .RS 4 |
|
|
| 453 | .Sp |
|
|
| 454 | Here is a nontrivial example that uses nsupdate to update the name => ip |
|
|
| 455 | mapping in some \s-1DNS\s0 zone: |
|
|
| 456 | .Sp |
|
|
| 457 | .Vb 6 |
|
|
| 458 | \& #!/bin/sh |
|
|
| 459 | \& { |
|
|
| 460 | \& echo update delete $DESTNODE.lowttl.example.net. a |
|
|
| 461 | \& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
|
|
| 462 | \& echo |
|
|
| 463 | \& } | nsupdate \-d \-k $CONFBASE:key.example.net. |
|
|
| 464 | .Ve |
|
|
| 465 | .RE |
|
|
| 466 | .IP "node-down = relative-or-absolute-path" 4 |
|
|
| 467 | .IX Item "node-down = relative-or-absolute-path" |
|
|
| 468 | Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost. |
|
|
| 469 | .IP "pid-file = path" 4 |
|
|
| 470 | .IX Item "pid-file = path" |
|
|
| 471 | The path to the pid file to check and create |
|
|
| 472 | (default: \f(CW\*(C`LOCALSTATEDIR/run/gvpe.pid\*(C'\fR). |
|
|
| 473 | .IP "private-key = relative-path-to-key" 4 |
|
|
| 474 | .IX Item "private-key = relative-path-to-key" |
|
|
| 475 | Sets the path (relative to the config directory) to the private key |
|
|
| 476 | (default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must |
|
|
| 477 | be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could |
|
|
| 478 | use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where |
|
|
| 479 | \&\f(CW\*(C`gvpectrl\*(C'\fR puts them. |
|
|
| 480 | .Sp |
|
|
| 481 | Since only the private key file of the current node is used and the |
|
|
| 482 | private key file should be kept secret per-node to avoid spoofing, it is |
|
|
| 483 | not recommended to use this feature. |
|
|
| 484 | .IP "rekey = seconds" 4 |
|
|
| 485 | .IX Item "rekey = seconds" |
|
|
| 486 | Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are |
|
|
| 487 | reestablished every \f(CW\*(C`rekey\*(C'\fR seconds, making them use a new encryption |
|
|
| 488 | key. |
|
|
| 489 | .IP "nfmark = integer" 4 |
|
|
| 490 | .IX Item "nfmark = integer" |
|
|
| 491 | This advanced option, when set to a nonzero value (default: \f(CW0\fR), tries |
|
|
| 492 | to set the netfilter mark (or fwmark) value on all sockets gvpe uses to |
|
|
| 493 | send packets. |
|
|
| 494 | .Sp |
|
|
| 495 | This can be used to make gvpe use a different set of routing rules. For |
|
|
| 496 | example, on GNU/Linux, the \f(CW\*(C`if\-up\*(C'\fR could set \f(CW\*(C`nfmark\*(C'\fR to 1000 and then |
|
|
| 497 | put all routing rules into table \f(CW99\fR and then use an ip rule to make |
|
|
| 498 | gvpe traffic avoid that routing table, in effect routing normal traffic |
|
|
| 499 | via gvpe and gvpe traffic via the normal system routing tables: |
|
|
| 500 | .Sp |
|
|
| 501 | .Vb 1 |
|
|
| 502 | \& ip rule add not fwmark 1000 lookup 99 |
|
|
| 503 | .Ve |
|
|
| 504 | .Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0" |
|
|
| 505 | .IX Subsection "NODE SPECIFIC SETTINGS" |
|
|
| 506 | The following settings are node-specific, that is, every node can have |
|
|
| 507 | different settings, even within the same gvpe instance. Settings that are |
|
|
| 508 | set before the first node section set the defaults, settings that are |
|
|
| 509 | set within a node section only apply to the given node. |
|
|
| 510 | .IP "allow-direct = nodename" 4 |
|
|
| 511 | .IX Item "allow-direct = nodename" |
|
|
| 512 | Allow direct connections to this node. See \f(CW\*(C`deny\-direct\*(C'\fR for more info. |
|
|
| 513 | .IP "compress = yes|true|on | no|false|off" 4 |
|
|
| 514 | .IX Item "compress = yes|true|on | no|false|off" |
|
|
| 515 | Wether to compress data packets sent to this node (default: \f(CW\*(C`yes\*(C'\fR). |
|
|
| 516 | Compression is really cheap even on slow computers and has no size |
|
|
| 517 | overhead at all, so enabling this is often a good idea. |
|
|
| 518 | .IP "connect = ondemand | never | always | disabled" 4 |
|
|
| 519 | .IX Item "connect = ondemand | never | always | disabled" |
|
|
| 520 | Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always |
|
|
| 521 | try to establish and keep a connection to the given node), \f(CW\*(C`never\*(C'\fR |
|
|
| 522 | (never initiate a connection to the given host, but accept connections), |
|
|
| 523 | \&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection when there are outstanding |
|
|
| 524 | packets in the queue and take it down after the keepalive interval) or |
|
|
| 525 | \&\f(CW\*(C`disabled\*(C'\fR (node is bad, don't talk to it). |
|
|
| 526 | .Sp |
|
|
| 527 | Routers will automatically be forced to \f(CW\*(C`always\*(C'\fR unless they are |
|
|
| 528 | \&\f(CW\*(C`disabled\*(C'\fR, to ensure all nodes can talk to each other. |
|
|
| 529 | .IP "deny-direct = nodename | *" 4 |
|
|
| 530 | .IX Item "deny-direct = nodename | *" |
|
|
| 531 | Deny direct connections to the specified node (or all nodes when \f(CW\*(C`*\*(C'\fR |
|
|
| 532 | is given). Only one node can be specified, but you can use multiple |
|
|
| 533 | \&\f(CW\*(C`allow\-direct\*(C'\fR and \f(CW\*(C`deny\-direct\*(C'\fR statements. This only makes sense in |
|
|
| 534 | networks with routers, as routers are required for indirect connections. |
|
|
| 535 | .Sp |
|
|
| 536 | Sometimes, a node cannot reach some other nodes for reasons of network |
|
|
| 537 | connectivity. For example, a node behind a firewall that only allows |
|
|
| 538 | connections to/from a single other node in the network. In this case one |
|
|
| 539 | should specify \f(CW\*(C`deny\-direct = *\*(C'\fR and \f(CW\*(C`allow\-direct = othernodename\*(C'\fR (the other |
|
|
| 540 | node \fImust\fR be a router for this to work). |
|
|
| 541 | .Sp |
|
|
| 542 | The algorithm to check whether a connection may be direct is as follows: |
|
|
| 543 | .Sp |
|
|
| 544 | 1. Other node mentioned in an \f(CW\*(C`allow\-direct\*(C'\fR? If yes, allow the connection. |
|
|
| 545 | .Sp |
|
|
| 546 | 2. Other node mentioned in a \f(CW\*(C`deny\-direct\*(C'\fR? If yes, deny direct connections. |
|
|
| 547 | .Sp |
|
|
| 548 | 3. Allow the connection. |
|
|
| 549 | .Sp |
|
|
| 550 | That is, \f(CW\*(C`allow\-direct\*(C'\fR takes precedence over \f(CW\*(C`deny\-direct\*(C'\fR. |
|
|
| 551 | .Sp |
|
|
| 552 | The check is done in both directions, i.e. both nodes must allow a direct |
|
|
| 553 | connection before one is attempted, so you only need to specify connect |
|
|
| 554 | limitations on one node. |
|
|
| 555 | .IP "dns-domain = domain-suffix" 4 |
|
|
| 556 | .IX Item "dns-domain = domain-suffix" |
|
|
| 557 | The \s-1DNS\s0 domain suffix that points to the \s-1DNS\s0 tunnel server for this node. |
|
|
| 558 | .Sp |
|
|
| 559 | The domain must point to a \s-1NS\s0 record that points to the \fIdns-hostname\fR, |
|
|
| 560 | i.e. |
|
|
| 561 | .Sp |
|
|
| 562 | .Vb 2 |
|
|
| 563 | \& dns\-domainname = tunnel.example.net |
|
|
| 564 | \& dns\-hostname = tunnel\-server.example.net |
|
|
| 565 | .Ve |
|
|
| 566 | .Sp |
|
|
| 567 | Corresponds to the following \s-1DNS\s0 entries in the \f(CW\*(C`example.net\*(C'\fR domain: |
|
|
| 568 | .Sp |
|
|
| 569 | .Vb 2 |
|
|
| 570 | \& tunnel.example.net. NS tunnel\-server.example.net. |
|
|
| 571 | \& tunnel\-server.example.net. A 13.13.13.13 |
|
|
| 572 | .Ve |
|
|
| 573 | .IP "dns-hostname = hostname/ip" 4 |
|
|
| 574 | .IX Item "dns-hostname = hostname/ip" |
|
|
| 575 | The address to bind the \s-1DNS\s0 tunnel socket to, similar to the \f(CW\*(C`hostname\*(C'\fR, |
|
|
| 576 | but for the \s-1DNS\s0 tunnel protocol only. Default: \f(CW0.0.0.0\fR, but that might |
|
|
| 577 | change. |
|
|
| 578 | .IP "dns-port = port-number" 4 |
|
|
| 579 | .IX Item "dns-port = port-number" |
|
|
| 580 | The port to bind the \s-1DNS\s0 tunnel socket to. Must be \f(CW53\fR on \s-1DNS\s0 tunnel servers. |
|
|
| 581 | .IP "enable-dns = yes|true|on | no|false|off" 4 |
|
|
| 582 | .IX Item "enable-dns = yes|true|on | no|false|off" |
|
|
| 583 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1DNS\s0 transport |
|
|
| 584 | protocol. Avoid this protocol if you can. |
|
|
| 585 | .Sp |
|
|
| 586 | Enable the \s-1DNS\s0 tunneling protocol on this node, either as server or as |
|
|
| 587 | client. Support for this transport protocol is only available when gvpe |
|
|
| 588 | was compiled using the \f(CW\*(C`\-\-enable\-dns\*(C'\fR option. |
|
|
| 589 | .IP "enable-icmp = yes|true|on | no|false|off" 4 |
|
|
| 590 | .IX Item "enable-icmp = yes|true|on | no|false|off" |
|
|
| 591 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1ICMP\s0 transport protocol. |
|
|
| 592 | .Sp |
|
|
| 593 | Enable the \s-1ICMP\s0 transport using \s-1ICMP\s0 packets of type \f(CW\*(C`icmp\-type\*(C'\fR on this |
|
|
| 594 | node. |
|
|
| 595 | .IP "enable-rawip = yes|true|on | no|false|off" 4 |
|
|
| 596 | .IX Item "enable-rawip = yes|true|on | no|false|off" |
|
|
| 597 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1RAW\s0 \s-1IP\s0 transport protocol. |
|
|
| 598 | .Sp |
|
|
| 599 | Enable the \s-1RAW\s0 IPv4 transport using the \f(CW\*(C`ip\-proto\*(C'\fR protocol |
|
|
| 600 | (default: \f(CW\*(C`no\*(C'\fR). |
|
|
| 601 | .IP "enable-tcp = yes|true|on | no|false|off" 4 |
|
|
| 602 | .IX Item "enable-tcp = yes|true|on | no|false|off" |
|
|
| 603 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1TCP\s0 transport protocol. |
|
|
| 604 | .Sp |
|
|
| 605 | Enable the TCPv4 transport using the \f(CW\*(C`tcp\-port\*(C'\fR port |
|
|
| 606 | (default: \f(CW\*(C`no\*(C'\fR). Support for this transport protocol is only available |
|
|
| 607 | when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option. |
|
|
| 608 | .IP "enable-udp = yes|true|on | no|false|off" 4 |
|
|
| 609 | .IX Item "enable-udp = yes|true|on | no|false|off" |
|
|
| 610 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1UDP\s0 transport protocol. |
|
|
| 611 | .Sp |
|
|
| 612 | Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`no\*(C'\fR, |
|
|
| 613 | unless no other protocol is enabled for a node, in which case this |
|
|
| 614 | protocol is enabled automatically). |
|
|
| 615 | .Sp |
|
|
| 616 | \&\s-1NOTE:\s0 Please specify \f(CW\*(C`enable\-udp = yes\*(C'\fR if you want to use it even though |
|
|
| 617 | it might get switched on automatically, as some future version might |
|
|
| 618 | default to another default protocol. |
|
|
| 619 | .IP "hostname = hostname | ip [can not be defaulted]" 4 |
|
|
| 620 | .IX Item "hostname = hostname | ip [can not be defaulted]" |
|
|
| 621 | Forces the address of this node to be set to the given \s-1DNS\s0 hostname or \s-1IP\s0 |
|
|
| 622 | address. It will be resolved before each connect request, so dyndns should |
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|
| 623 | work fine. If this setting is not specified and a router is available, |
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|
| 624 | then the router will be queried for the address of this node. Otherwise, |
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|
| 625 | the connection attempt will fail. |
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|
| 626 | .Sp |
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|
| 627 | Note that \s-1DNS\s0 resolving is done synchronously, pausing the daemon. If that |
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|
| 628 | is an issue you need to specify \s-1IP\s0 addresses. |
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|
| 629 | .IP "icmp-type = integer" 4 |
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|
| 630 | .IX Item "icmp-type = integer" |
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| 631 | Sets the type value to be used for outgoing (and incoming) packets sent |
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|
| 632 | via the \s-1ICMP\s0 transport. |
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| 633 | .Sp |
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|
| 634 | The default is \f(CW0\fR (which is \f(CW\*(C`echo\-reply\*(C'\fR, also known as |
|
|
| 635 | \&\*(L"ping-reply\*(R"). Other useful values include \f(CW8\fR (\f(CW\*(C`echo\-request\*(C'\fR, a.k.a. |
|
|
| 636 | \&\*(L"ping\*(R") and \f(CW11\fR (\f(CW\*(C`time\-exceeded\*(C'\fR), but any 8\-bit value can be used. |
|
|
| 637 | .IP "if-up-data = value" 4 |
|
|
| 638 | .IX Item "if-up-data = value" |
|
|
| 639 | The value specified using this directive will be passed to the \f(CW\*(C`if\-up\*(C'\fR |
|
|
| 640 | script in the environment variable \f(CW\*(C`IFUPDATA\*(C'\fR. |
|
|
| 641 | .IP "inherit-tos = yes|true|on | no|false|off" 4 |
|
|
| 642 | .IX Item "inherit-tos = yes|true|on | no|false|off" |
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|
| 643 | Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when |
|
|
| 644 | sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then |
|
|
| 645 | outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent |
|
|
| 646 | to the tunnel device, which is usually what you want. |
|
|
| 647 | .IP "max-retry = positive-number" 4 |
|
|
| 648 | .IX Item "max-retry = positive-number" |
|
|
| 649 | The maximum interval in seconds (default: \f(CW3600\fR, one hour) between |
|
|
| 650 | retries to establish a connection to this node. When a connection cannot |
|
|
| 651 | be established, gvpe uses exponential back-off capped at this value. It's |
|
|
| 652 | sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on |
|
|
| 653 | connections to routers that usually are stable but sometimes are down, to |
|
|
| 654 | assure quick reconnections even after longer downtimes. |
|
|
| 655 | .IP "max-ttl = seconds" 4 |
|
|
| 656 | .IX Item "max-ttl = seconds" |
|
|
| 657 | Expire packets that couldn't be sent after this many seconds |
|
|
| 658 | (default: \f(CW60\fR). Gvpe will normally queue packets for a node without an |
|
|
| 659 | active connection, in the hope of establishing a connection soon. This |
|
|
| 660 | value specifies the maximum lifetime a packet will stay in the queue, if a |
|
|
| 661 | packet gets older, it will be thrown away. |
|
|
| 662 | .IP "max-queue = positive\-number>=1" 4 |
|
|
| 663 | .IX Item "max-queue = positive-number>=1" |
|
|
| 664 | The maximum number of packets that will be queued (default: \f(CW512\fR) |
|
|
| 665 | for this node. If more packets are sent then earlier packets will be |
|
|
| 666 | expired. See \f(CW\*(C`max\-ttl\*(C'\fR, above. |
|
|
| 667 | .IP "router-priority = 0 | 1 | positive\-number>=2" 4 |
|
|
| 668 | .IX Item "router-priority = 0 | 1 | positive-number>=2" |
|
|
| 669 | Sets the router priority of the given node (default: \f(CW0\fR, disabled). |
|
|
| 670 | .Sp |
|
|
| 671 | If some node tries to connect to another node but it doesn't have a |
|
|
| 672 | hostname, it asks a router node for it's \s-1IP\s0 address. The router node |
|
|
| 673 | chosen is the one with the highest priority larger than \f(CW1\fR that is |
|
|
| 674 | currently reachable. This is called a \fImediated\fR connection, as the |
|
|
| 675 | connection itself will still be direct, but it uses another node to |
|
|
| 676 | mediate between the two nodes. |
|
|
| 677 | .Sp |
|
|
| 678 | The value \f(CW0\fR disables routing, that means if the node receives a packet |
|
|
| 679 | not for itself it will not forward it but instead drop it. |
|
|
| 680 | .Sp |
|
|
| 681 | The special value \f(CW1\fR allows other hosts to route through the router |
|
|
| 682 | host, but they will never route through it by default (i.e. the config |
|
|
| 683 | file of another node needs to specify a router priority higher than one |
|
|
| 684 | to choose such a node for routing). |
|
|
| 685 | .Sp |
|
|
| 686 | The idea behind this is that some hosts can, if required, bump the |
|
|
| 687 | \&\f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their local config to |
|
|
| 688 | route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is \f(CW0\fR, then routing |
|
|
| 689 | will be refused, so \f(CW1\fR serves as a \*(L"enable, but do not use by default\*(R" |
|
|
| 690 | switch. |
|
|
| 691 | .Sp |
|
|
| 692 | Nodes with \f(CW\*(C`router\-priority\*(C'\fR set to \f(CW2\fR or higher will always be forced |
|
|
| 693 | to \f(CW\*(C`connect\*(C'\fR = \f(CW\*(C`always\*(C'\fR (unless they are \f(CW\*(C`disabled\*(C'\fR). |
|
|
| 694 | .IP "tcp-port = port-number" 4 |
|
|
| 695 | .IX Item "tcp-port = port-number" |
|
|
| 696 | Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number. |
|
|
| 697 | .IP "udp-port = port-number" 4 |
|
|
| 698 | .IX Item "udp-port = port-number" |
|
|
| 699 | Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not |
|
|
| 700 | officially assigned by \s-1IANA\s0!). |
|
|
| 701 | .SH "CONFIG DIRECTORY LAYOUT" |
|
|
| 702 | .IX Header "CONFIG DIRECTORY LAYOUT" |
|
|
| 703 | The default (or recommended) directory layout for the config directory is: |
|
|
| 704 | .IP "gvpe.conf" 4 |
|
|
| 705 | .IX Item "gvpe.conf" |
|
|
| 706 | The config file. |
|
|
| 707 | .IP "if-up" 4 |
|
|
| 708 | .IX Item "if-up" |
|
|
| 709 | The if-up script |
|
|
| 710 | .IP "node-up, node-down" 4 |
|
|
| 711 | .IX Item "node-up, node-down" |
|
|
| 712 | If used the node up or node-down scripts. |
|
|
| 713 | .IP "hostkey" 4 |
|
|
| 714 | .IX Item "hostkey" |
|
|
| 715 | The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host. |
|
|
| 716 | .IP "pubkey/nodename" 4 |
|
|
| 717 | .IX Item "pubkey/nodename" |
|
|
| 718 | The public keys of the other nodes, one file per node. |
|
|
| 719 | .SH "SEE ALSO" |
|
|
| 720 | .IX Header "SEE ALSO" |
|
|
| 721 | \&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8). |
|
|
| 722 | .SH "AUTHOR" |
|
|
| 723 | .IX Header "AUTHOR" |
|
|
| 724 | Marc Lehmann <gvpe@schmorp.de> |
|
|
