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129 | .\" ======================================================================== |
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130 | .\" |
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131 | .IX Title "GVPE.CONF 5" |
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132 | .TH GVPE.CONF 5 "2004-12-04" "1.7" "GNU Virtual Private Ethernet" |
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133 | .SH "NAME" |
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134 | gvpe.conf \- configuration file for the GNU VPE daemon |
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135 | .SH "SYNOPSIS" |
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136 | .IX Header "SYNOPSIS" |
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137 | .Vb 4 |
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138 | \& enable-udp = yes |
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139 | \& udp-port = 407 |
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140 | \& mtu = 1492 |
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141 | \& ifname = vpn0 |
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142 | .Ve |
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143 | .PP |
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144 | .Vb 2 |
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145 | \& node = branch1 |
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146 | \& hostname = 1.2.3.4 |
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147 | .Ve |
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148 | .PP |
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149 | .Vb 3 |
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150 | \& node = branch2 |
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151 | \& hostname = www.example.net |
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152 | \& udp-port = 500 # this host uses a different udp-port |
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153 | .Ve |
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154 | .PP |
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155 | .Vb 2 |
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156 | \& node = branch3 |
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157 | \& connect = ondemand |
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158 | .Ve |
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159 | .SH "DESCRIPTION" |
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160 | .IX Header "DESCRIPTION" |
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161 | The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable |
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162 | = value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR and |
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163 | extend to the end of the line. They can be used on their own lines, or |
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164 | after any directives. Spaces are allowed before or after the \f(CW\*(C`=\*(C'\fR sign or |
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165 | after values, but not within the variable names or values themselves. |
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166 | .PP |
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167 | The only exception to the above is the \*(L"on\*(R" directive that can prefix any |
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168 | \&\f(CW\*(C`name = value\*(C'\fR setting and will only \*(L"execute\*(R" it on the named node, or |
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169 | (if the nodename starts with \*(L"!\*(R") on all nodes except the named one. |
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170 | .PP |
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171 | .Vb 3 |
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172 | \& name = value |
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173 | \& on branch1 loglevel = noise |
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174 | \& on !branch2 connect = ondemand |
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175 | .Ve |
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176 | .PP |
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177 | All settings are executed \*(L"in order\*(R", that is, later settings of the same |
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178 | variable overwrite earlier ones. |
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179 | .SH "ANATOMY OF A CONFIG FILE" |
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180 | .IX Header "ANATOMY OF A CONFIG FILE" |
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181 | Usually, a config file starts with global settings (like the udp port to |
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182 | listen on), followed by node-specific sections that begin with a \f(CW\*(C`node = |
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183 | nickname\*(C'\fR line. |
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184 | .PP |
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185 | Every node that is part of the network must have a section that starts |
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186 | with \f(CW\*(C`node = nickname\*(C'\fR. The number and order of the nodes is important |
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187 | and must be the same on all hosts. It is not uncommon for node sections to |
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188 | be completely empty \- if the default values are right. |
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189 | .PP |
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190 | Node-specific settings can be used at any time. If used before the first |
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191 | node section they will set the default values for all following nodes. |
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192 | .SH "CONFIG VARIABLES" |
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193 | .IX Header "CONFIG VARIABLES" |
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194 | .Sh "\s-1GLOBAL\s0 \s-1SETTINGS\s0" |
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195 | .IX Subsection "GLOBAL SETTINGS" |
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196 | Global settings will affect the behaviour of the running gvpe daemon, that |
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197 | is, they are in some sense node-specific (config files can set different |
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198 | values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of |
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199 | the gvpe daemon and all connections it creates. |
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200 | .IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4 |
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201 | .IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical" |
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202 | Set the logging level. Connection established messages are logged at level |
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203 | \&\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. |
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204 | .IP "node = nickname" 4 |
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205 | .IX Item "node = nickname" |
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206 | Not really a config setting but introduces a node section. The nickname is |
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207 | used to select the right configuration section and must be passed as an |
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208 | argument to the gvpe daemon. |
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209 | .IP "private-key = relative-path-to-key" 4 |
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210 | .IX Item "private-key = relative-path-to-key" |
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211 | Sets the path (relative to the config directory) to the private key |
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212 | (default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must |
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213 | be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could |
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214 | use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where |
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215 | \&\f(CW\*(C`gvpectrl\*(C'\fR puts them. |
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216 | .Sp |
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217 | Since only the private key file of the current node is used and the |
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218 | private key file should be kept secret per-host to avoid spoofings, it is |
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219 | not recommended to use this feature. |
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220 | .IP "ifpersist = yes|true|on | no|false|off" 4 |
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221 | .IX Item "ifpersist = yes|true|on | no|false|off" |
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222 | Should the tun/tap device be made persistent, that is, should the device |
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223 | stay up even when gvpe exits? Some versions of the tunnel device have |
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224 | problems sending packets when gvpe is restarted in persistent mode, so |
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225 | if the connections can be established but you cannot send packets from |
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226 | the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the |
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227 | device. |
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228 | .IP "ifname = devname" 4 |
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229 | .IX Item "ifname = devname" |
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230 | Sets the tun interface name to the given name. The default is OS-specific |
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231 | and most probably something like \f(CW\*(C`tun0\*(C'\fR. |
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232 | .IP "rekey = seconds" 4 |
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233 | .IX Item "rekey = seconds" |
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234 | Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are |
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235 | reestablished every \f(CW\*(C`rekey\*(C'\fR seconds. |
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236 | .IP "keepalive = seconds" 4 |
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237 | .IX Item "keepalive = seconds" |
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238 | Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this |
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239 | many seconds of inactivity the daemon will start to send keepalive probe |
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240 | every 5 seconds until it receives a reply from the other end. If no reply |
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241 | is received within 30 seconds, the peer is considered unreachable and the |
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242 | connection is closed. |
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243 | .IP "mtu = bytes" 4 |
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244 | .IX Item "mtu = bytes" |
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245 | Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically |
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246 | the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate |
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247 | maximum overhead (e.g. udp header size, encryption blocksize...) and pass |
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248 | this information to the \f(CW\*(C`if\-up\*(C'\fR script. |
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249 | .Sp |
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250 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
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251 | .Sp |
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252 | This value must be the minimum of the mtu values of all hosts. |
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253 | .IP "ip-proto = numerical-ip-protocol" 4 |
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254 | .IX Item "ip-proto = numerical-ip-protocol" |
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255 | Sets the protocol number to be used for the rawip protocol. This is a |
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256 | global option because all hosts must use the same protocol, and since |
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257 | there are no port numbers, you cannot easily run more than one gvpe |
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258 | instance using the same protocol, nor can you share the protocol with |
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259 | other programs. |
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260 | .Sp |
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261 | The default is 47 (\s-1GRE\s0), which has a good chance of tunneling through |
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262 | firewalls (but note that the rawip protocol is not \s-1GRE\s0 compatible). Other |
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263 | common choices are 50 (\s-1IPSEC\s0, \s-1ESP\s0), 51 (\s-1IPSEC\s0, \s-1AH\s0), 4 (\s-1IPIP\s0 tunnels) or 98 |
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264 | (\s-1ENCAP\s0, rfc1241) |
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265 | .IP "if-up = relative-or-absolute-path" 4 |
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266 | .IX Item "if-up = relative-or-absolute-path" |
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267 | Sets the path of a script that should be called immediately after the |
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268 | network interface is initialized (but not neccessarily up). The following |
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269 | environment variables are passed to it (the values are just examples): |
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270 | .RS 4 |
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271 | .IP "CONFBASE=/etc/gvpe" 4 |
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272 | .IX Item "CONFBASE=/etc/gvpe" |
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273 | The configuration base directory. |
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274 | .IP "IFNAME=vpn0" 4 |
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275 | .IX Item "IFNAME=vpn0" |
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276 | The interface to initialize. |
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277 | .IP "MTU=1436" 4 |
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278 | .IX Item "MTU=1436" |
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279 | The \s-1MTU\s0 to set the interface to. You can use lower values (if done |
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280 | consistently on all hosts), but this is usually ineffective. |
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281 | .IP "MAC=fe:fd:80:00:00:01" 4 |
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282 | .IX Item "MAC=fe:fd:80:00:00:01" |
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283 | The \s-1MAC\s0 address to set the interface to. The script *must* set the |
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284 | interface \s-1MAC\s0 to this value. You will most likely use one of these: |
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285 | .Sp |
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286 | .Vb 2 |
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287 | \& ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux |
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288 | \& ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD |
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289 | .Ve |
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290 | .Sp |
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291 | Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR manpage for platform-specific information. |
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292 | .IP "IFTYPE=native # or tincd" 4 |
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293 | .IX Item "IFTYPE=native # or tincd" |
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294 | .PD 0 |
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295 | .IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4 |
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296 | .IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.." |
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297 | .PD |
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298 | The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the os |
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299 | name in lowercase) that this gvpe was configured for. Can be used to select |
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300 | the correct syntax to use for network-related commands. |
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301 | .IP "NODENAME=branch1" 4 |
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302 | .IX Item "NODENAME=branch1" |
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303 | The nickname of the current node, as passed to the gvpe daemon. |
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304 | .IP "NODEID=1" 4 |
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305 | .IX Item "NODEID=1" |
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306 | The numerical node id of the current node. The first node mentioned in the |
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307 | config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on. |
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308 | .RE |
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309 | .RS 4 |
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310 | .Sp |
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311 | Here is a simple if-up script: |
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312 | .Sp |
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313 | .Vb 5 |
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314 | \& #!/bin/sh |
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315 | \& ip link set $IFNAME address $MAC mtu $MTU up |
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316 | \& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
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317 | \& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
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318 | \& ip route add 10.0.0.0/8 dev $IFNAME |
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319 | .Ve |
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320 | .Sp |
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321 | More complicated examples (using routing to reduce arp traffic) can be |
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322 | found in the etc/ subdirectory of the distribution. |
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323 | .RE |
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324 | .IP "node-up = relative-or-absolute-path" 4 |
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325 | .IX Item "node-up = relative-or-absolute-path" |
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326 | Sets a command (default: no script) that should be called whenever a |
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327 | connection is established (even on rekeying operations). In addition |
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328 | to the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following environment |
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329 | variables will be set: |
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330 | .RS 4 |
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331 | .IP "DESTNODE=branch2" 4 |
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332 | .IX Item "DESTNODE=branch2" |
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333 | The name of the remote node. |
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334 | .IP "DESTID=2" 4 |
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335 | .IX Item "DESTID=2" |
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336 | The node id of the remote node. |
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337 | .IP "DESTIP=188.13.66.8" 4 |
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338 | .IX Item "DESTIP=188.13.66.8" |
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339 | The numerical \s-1IP\s0 address of the remote host (gvpe accepts connections from |
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340 | everywhere, as long as the other host can authenticate itself). |
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341 | .IP "DESTPORT=655 # deprecated" 4 |
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342 | .IX Item "DESTPORT=655 # deprecated" |
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343 | The \s-1UDP\s0 port used by the other side. |
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344 | .IP "STATE=UP" 4 |
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345 | .IX Item "STATE=UP" |
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346 | Node-up scripts get called with STATE=UP, node-down scripts get called |
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347 | with STATE=DOWN. |
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348 | .RE |
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349 | .RS 4 |
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350 | .Sp |
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351 | Here is a nontrivial example that uses nsupdate to update the name => ip |
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352 | mapping in some dns zone: |
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353 | .Sp |
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354 | .Vb 6 |
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355 | \& #!/bin/sh |
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356 | \& { |
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357 | \& echo update delete $DESTNODE.lowttl.example.net. a |
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358 | \& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
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359 | \& echo |
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360 | \& } | nsupdate -d -k $CONFBASE:key.example.net. |
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361 | .Ve |
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362 | .RE |
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363 | .IP "node-down = relative-or-absolute-path" 4 |
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364 | .IX Item "node-down = relative-or-absolute-path" |
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365 | Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost. |
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366 | .IP "http-proxy-host = hostname/ip" 4 |
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367 | .IX Item "http-proxy-host = hostname/ip" |
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368 | The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was |
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369 | compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of |
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370 | tcp connections through a http proxy server. |
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371 | .Sp |
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372 | \&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and |
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373 | port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy |
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374 | requires authentication. |
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375 | .Sp |
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376 | Please note that gvpe will still try to resolve all hostnames in the |
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377 | configuration file, so if you are behind a proxy without access to a dns |
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378 | server better use numerical \s-1IP\s0 addresses. |
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379 | .Sp |
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380 | To make best use of this option disable all protocols except tcp in your |
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381 | config file and make sure your routers (or all other hosts) are listening |
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382 | on a port that the proxy allows (443, https, is a common choice). |
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383 | .Sp |
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384 | If you have a router, connecting to it will suffice. Otherwise tcp must be |
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385 | enabled on all hosts. |
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386 | .Sp |
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387 | Example: |
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388 | .Sp |
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389 | .Vb 3 |
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390 | \& http-proxy-host = proxy.example.com |
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391 | \& http-proxy-port = 3128 # 8080 is another common choice |
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392 | \& http-proxy-auth = schmorp:grumbeere |
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393 | .Ve |
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394 | .IP "http-proxy-port = proxy-tcp-port" 4 |
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395 | .IX Item "http-proxy-port = proxy-tcp-port" |
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396 | The port where your proxy server listens. |
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397 | .IP "http-proxy-auth = login:password" 4 |
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398 | .IX Item "http-proxy-auth = login:password" |
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399 | The optional login and password used to authenticate to the proxy server, |
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400 | seperated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is |
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401 | currently supported. |
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402 | .IP "pid-file = path" 4 |
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403 | .IX Item "pid-file = path" |
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404 | The path to the pid file to check and create (Default: |
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405 | .Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0" |
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406 | .IX Subsection "NODE SPECIFIC SETTINGS" |
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407 | The following settings are node\-specific, that is, every node can have |
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408 | different settings, even within the same gvpe instance. Settings that are |
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409 | executed before the first node section set the defaults, settings that are |
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410 | executed within a node section only apply to the given node. |
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411 | .IP "udp-port = port-number" 4 |
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412 | .IX Item "udp-port = port-number" |
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413 | Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not |
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414 | officially assigned by \s-1IANA\s0!). |
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415 | .IP "tcp-port = port-number" 4 |
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416 | .IX Item "tcp-port = port-number" |
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417 | Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number. |
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418 | .IP "enable-rawip = yes|true|on | no|false|off" 4 |
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419 | .IX Item "enable-rawip = yes|true|on | no|false|off" |
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420 | Enable the \s-1RAW\s0 IPv4 transport using the \f(CW\*(C`ip\-proto\*(C'\fR protocol |
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421 | (default: \f(CW\*(C`no\*(C'\fR). This is the best choice, since the overhead per packet |
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422 | is only 38 bytes, as opposed to \s-1UDP\s0's 58 (or \s-1TCP\s0's 60+). |
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423 | .IP "enable-udp = yes|true|on | no|false|off" 4 |
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424 | .IX Item "enable-udp = yes|true|on | no|false|off" |
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425 | Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`yes\*(C'\fR, |
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426 | but this will change!). This is a good general choice since \s-1UDP\s0 tunnels |
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427 | well through many firewalls. |
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428 | .Sp |
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429 | \&\s-1NOTE:\s0 Please specify \f(CW\*(C`enable\-udp = yes\*(C'\fR even though it is the default, as |
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430 | some future version will have all protocols disabled by default. |
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431 | .IP "enable-tcp = yes|true|on | no|false|off" 4 |
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432 | .IX Item "enable-tcp = yes|true|on | no|false|off" |
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433 | Enable the TCPv4 transport using the \f(CW\*(C`tcp\-port\*(C'\fR port |
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434 | (default: \f(CW\*(C`no\*(C'\fR). Support for this horribly unsuitable protocol is only |
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435 | available when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option. Never |
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436 | use this transport unless you really must, it is horribly ineffiecent and |
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437 | resource-intensive compared to the other transports. |
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438 | .IP "router-priority = 0 | 1 | positive\-number>2" 4 |
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439 | .IX Item "router-priority = 0 | 1 | positive-number>2" |
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440 | Sets the router priority of the given host (default: \f(CW0\fR, disabled). If |
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441 | some host tries to connect to another host without a hostname, it asks |
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442 | the router host for it's \s-1IP\s0 address. The router host is the one with the |
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443 | highest priority larger than \f(CW1\fR that is currently reachable. |
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444 | .Sp |
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445 | Make sure all hosts always connect (\f(CW\*(C`connect = always\*(C'\fR) to the router |
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446 | hosts, otherwise connecting to them might be impossible. |
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447 | .Sp |
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448 | The special value \f(CW1\fR allows other hosts to route through the router |
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449 | host, but they will never route through it by default. The value \f(CW0\fR |
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450 | disables routing. The idea behind this is that some hosts can, if |
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451 | required, bump the \f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their |
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452 | local config to route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is |
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453 | \&\f(CW0\fR, then routing will be refused, so \f(CW1\fR serves as a \*(L"enable, but do |
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454 | not use by default\*(R" switch. |
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455 | .IP "connect = ondemand | never | always | disabled" 4 |
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456 | .IX Item "connect = ondemand | never | always | disabled" |
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457 | Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always |
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458 | try to establish and keep a connection to the given host), \f(CW\*(C`never\*(C'\fR |
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459 | (never initiate a connection to the given host, but accept connections), |
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460 | \&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection on the first packet sent, and |
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461 | take it down after the keepalive interval) or \f(CW\*(C`disabled\*(C'\fR (node is bad, |
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462 | don't talk to it). |
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463 | .IP "inherit-tos = yes|true|on | no|false|off" 4 |
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464 | .IX Item "inherit-tos = yes|true|on | no|false|off" |
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465 | Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when |
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466 | sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then |
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467 | outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent |
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468 | to the tunnel device, which is usually what you want. |
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469 | .IP "compress = yes|true|on | no|false|off" 4 |
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470 | .IX Item "compress = yes|true|on | no|false|off" |
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471 | Wether to compress data packets sent to this host (default: \f(CW\*(C`yes\*(C'\fR). |
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472 | Compression is really cheap even on slow computers and has no size |
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473 | overhead at all, so enabling this is a good idea. |
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474 | .IP "max-retry = positive-number" 4 |
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475 | .IX Item "max-retry = positive-number" |
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476 | The maximum interval in seconds (default: \f(CW28800\fR, 8 hours) between |
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477 | retries to establish a connection to this node. When a connection cannot |
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478 | be established, gvpe uses exponential backoff capped at this value. It's |
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479 | sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on |
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480 | connections to routers that usually are stable but sometimes are down, to |
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481 | assure quick reconnections. |
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482 | .SH "CONFIG DIRECTORY LAYOUT" |
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483 | .IX Header "CONFIG DIRECTORY LAYOUT" |
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484 | The default (or recommended) directory layout for the config directory is: |
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485 | .IP "gvpe.conf" 4 |
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486 | .IX Item "gvpe.conf" |
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487 | The config file. |
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488 | .IP "if-up" 4 |
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489 | .IX Item "if-up" |
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490 | The if-up script |
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491 | .IP "node\-up, node-down" 4 |
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492 | .IX Item "node-up, node-down" |
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493 | If used the node up or node-down scripts. |
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494 | .IP "hostkey" 4 |
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495 | .IX Item "hostkey" |
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496 | The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host. |
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497 | .IP "pubkey/nodename" 4 |
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498 | .IX Item "pubkey/nodename" |
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499 | The public keys of the other nodes, one file per node. |
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500 | .SH "SEE ALSO" |
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501 | .IX Header "SEE ALSO" |
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502 | \&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8). |
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503 | .SH "AUTHOR" |
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504 | .IX Header "AUTHOR" |
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505 | Marc Lehmann <gvpe@plan9.de> |
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