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133 | .\" ======================================================================== |
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134 | .\" |
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135 | .IX Title "GVPE.CONF 5" |
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136 | .TH GVPE.CONF 5 "2016-11-12" "3.0" "GNU Virtual Private Ethernet" |
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137 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
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138 | .\" way too many mistakes in technical documents. |
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139 | .if n .ad l |
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140 | .nh |
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141 | .SH "NAME" |
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142 | gvpe.conf \- configuration file for the GNU VPE daemon |
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143 | .SH "SYNOPSIS" |
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144 | .IX Header "SYNOPSIS" |
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145 | .Vb 4 |
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146 | \& # global options for all nodes |
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147 | \& udp\-port = 407 |
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148 | \& mtu = 1492 |
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149 | \& ifname = vpn0 |
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150 | \& |
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151 | \& # first node is named branch1 and is at 1.2.3.4 |
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152 | \& node = branch1 |
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153 | \& hostname = 1.2.3.4 |
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154 | \& |
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155 | \& # second node uses dns to resolve the address |
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156 | \& node = branch2 |
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157 | \& hostname = www.example.net |
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158 | \& udp\-port = 500 # this host uses a different udp\-port |
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159 | \& |
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160 | \& # third node has no fixed ip address |
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161 | \& node = branch3 |
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162 | \& connect = ondemand |
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163 | .Ve |
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164 | .SH "DESCRIPTION" |
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165 | .IX Header "DESCRIPTION" |
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166 | The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable |
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167 | = value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR and |
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168 | extend to the end of the line. They can be used on their own lines, or |
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169 | after any directives. Whitespace is allowed around the \f(CW\*(C`=\*(C'\fR sign or after |
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170 | values, but not within the variable names or values themselves. |
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171 | .PP |
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172 | All settings are applied \*(L"in order\*(R", that is, later settings of the same |
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173 | variable overwrite earlier ones. |
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174 | .PP |
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175 | The only exceptions to the above are the following directives: |
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176 | .IP "node nodename" 4 |
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177 | .IX Item "node nodename" |
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178 | Introduces a node section. The nodename is used to select the right |
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179 | configuration section and is the same string as is passed as an argument |
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180 | to the gvpe daemon. |
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181 | .Sp |
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182 | Multiple \f(CW\*(C`node\*(C'\fR statements with the same node name are supported and will |
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183 | be merged together. |
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184 | .IP "global" 4 |
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185 | .IX Item "global" |
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186 | This statement switches back to the global section, which is mainly |
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187 | useful if you want to include a second config file, e..g for local |
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188 | customisations. To do that, simply include this at the very end of your |
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189 | config file: |
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190 | .Sp |
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191 | .Vb 2 |
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192 | \& global |
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193 | \& include local.conf |
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194 | .Ve |
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195 | .IP "on nodename ..." 4 |
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196 | .IX Item "on nodename ..." |
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197 | .PD 0 |
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198 | .IP "on !nodename ..." 4 |
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199 | .IX Item "on !nodename ..." |
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200 | .PD |
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201 | You can prefix any configuration directive with \f(CW\*(C`on\*(C'\fR and a nodename. \s-1GVPE\s0 |
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202 | will will only \*(L"execute\*(R" it on the named node, or (if the nodename starts |
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203 | with \f(CW\*(C`!\*(C'\fR) on all nodes except the named one. |
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204 | .Sp |
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205 | Example: set the \s-1MTU\s0 to \f(CW1450\fR everywhere, \f(CW\*(C`loglevel\*(C'\fR to \f(CW\*(C`noise\*(C'\fR on |
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206 | \&\f(CW\*(C`branch1\*(C'\fR, and \f(CW\*(C`connect\*(C'\fR to \f(CW\*(C`ondemand\*(C'\fR everywhere but on branch2. |
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207 | .Sp |
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208 | .Vb 3 |
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209 | \& mtu = 1450 |
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210 | \& on branch1 loglevel = noise |
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211 | \& on !branch2 connect = ondemand |
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212 | .Ve |
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213 | .IP "include relative-or-absolute-path" 4 |
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214 | .IX Item "include relative-or-absolute-path" |
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215 | Reads the specified file (the path must not contain whitespace or \f(CW\*(C`=\*(C'\fR |
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216 | characters) and evaluate all config directives in it as if they were |
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217 | spelled out in place of the \f(CW\*(C`include\*(C'\fR directive. |
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218 | .Sp |
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219 | The path is a printf format string, that is, you must escape any \f(CW\*(C`%\*(C'\fR |
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220 | by doubling it, and you can have a single \f(CW%s\fR inside, which will be |
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221 | replaced by the current nodename. |
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222 | .Sp |
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223 | Relative paths are interpreted relative to the \s-1GVPE\s0 config directory. |
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224 | .Sp |
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225 | Example: include the file \fIlocal.conf\fR in the config directory on every |
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226 | node. |
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227 | .Sp |
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228 | .Vb 1 |
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229 | \& include local.conf |
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230 | .Ve |
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231 | .Sp |
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232 | Example: include a file \fIconf/\fRnodename\fI.conf\fR |
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233 | .Sp |
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234 | .Vb 1 |
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235 | \& include conf/%s.conf |
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236 | .Ve |
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237 | .SH "ANATOMY OF A CONFIG FILE" |
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238 | .IX Header "ANATOMY OF A CONFIG FILE" |
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239 | Usually, a config file starts with a few global settings (like the \s-1UDP\s0 |
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240 | port to listen on), followed by node-specific sections that begin with a |
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241 | \&\f(CW\*(C`node = nickname\*(C'\fR line. |
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242 | .PP |
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243 | Every node that is part of the network must have a section that starts |
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244 | with \f(CW\*(C`node = nickname\*(C'\fR. The number and order of the nodes is important |
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245 | and must be the same on all nodes. It is not uncommon for node sections to |
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246 | be completely empty \- if the default values are right. |
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247 | .PP |
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248 | Node-specific settings can be used at any time. If used before the first |
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249 | node section they will set the default values for all following nodes. |
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250 | .SH "CONFIG VARIABLES" |
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251 | .IX Header "CONFIG VARIABLES" |
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252 | .SS "\s-1GLOBAL SETTINGS\s0" |
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253 | .IX Subsection "GLOBAL SETTINGS" |
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254 | Global settings will affect the behaviour of the running gvpe daemon, that |
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255 | is, they are in some sense node-specific (config files can set different |
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256 | values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of |
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257 | the gvpe daemon and all connections it creates. |
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258 | .IP "chroot = path or /" 4 |
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259 | .IX Item "chroot = path or /" |
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260 | Tells \s-1GVPE\s0 to \fIchroot\fR\|(2) to the specified path after reading all necessary |
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261 | files, binding to sockets and running the \f(CW\*(C`if\-up\*(C'\fR script, but before |
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262 | running \f(CW\*(C`node\-up\*(C'\fR or any other scripts. |
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263 | .Sp |
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264 | The special path \fI/\fR instructs \s-1GVPE\s0 to create (and remove) an empty |
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265 | temporary directory to use as new root. This is most secure, but makes it |
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266 | impossible to use any scripts other than the \f(CW\*(C`if\-up\*(C'\fR one. |
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267 | .IP "chuid = numerical-uid" 4 |
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268 | .IX Item "chuid = numerical-uid" |
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269 | .PD 0 |
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270 | .IP "chgid = numerical-gid" 4 |
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271 | .IX Item "chgid = numerical-gid" |
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272 | .PD |
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273 | These two options tell \s-1GVPE\s0 to change to the given user and/or group id |
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274 | after reading all necessary files, binding to sockets and running the |
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275 | \&\f(CW\*(C`if\-up\*(C'\fR script. |
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276 | .Sp |
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277 | Other scripts, such as \f(CW\*(C`node\-up\*(C'\fR, are run with the new user id or group id. |
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278 | .IP "chuser = username" 4 |
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279 | .IX Item "chuser = username" |
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280 | Alternative to \f(CW\*(C`chuid\*(C'\fR and \f(CW\*(C`chgid\*(C'\fR: Sets both \f(CW\*(C`chuid\*(C'\fR and \f(CW\*(C`chgid\*(C'\fR |
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281 | to the user and (primary) group ids of the specified user (for example, |
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282 | \&\f(CW\*(C`nobody\*(C'\fR). |
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283 | .IP "dns-forw-host = hostname/ip" 4 |
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284 | .IX Item "dns-forw-host = hostname/ip" |
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285 | The \s-1DNS\s0 server to forward \s-1DNS\s0 requests to for the \s-1DNS\s0 tunnel protocol |
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286 | (default: \f(CW127.0.0.1\fR, changing it is highly recommended). |
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287 | .IP "dns-forw-port = port-number" 4 |
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288 | .IX Item "dns-forw-port = port-number" |
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289 | The port where the \f(CW\*(C`dns\-forw\-host\*(C'\fR is to be contacted (default: \f(CW53\fR, |
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290 | which is fine in most cases). |
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291 | .IP "dns-case-preserving = yes|true|on | no|false|off" 4 |
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292 | .IX Item "dns-case-preserving = yes|true|on | no|false|off" |
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293 | Sets whether the \s-1DNS\s0 transport forwarding server preserves case (\s-1DNS\s0 |
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294 | servers have to, but some access systems are even more broken than others) |
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295 | (default: true). |
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296 | .Sp |
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297 | Normally, when the forwarding server changes the case of domain names then |
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298 | \&\s-1GVPE\s0 will automatically set this to false. |
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299 | .IP "dns-max-outstanding = integer-number-of-requests" 4 |
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300 | .IX Item "dns-max-outstanding = integer-number-of-requests" |
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301 | The maximum number of outstanding \s-1DNS\s0 transport requests |
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302 | (default: \f(CW100\fR). \s-1GVPE\s0 will never issue more requests then the given |
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303 | limit without receiving replies. In heavily overloaded situations it might |
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304 | 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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305 | number of parallel requests. |
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306 | .Sp |
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307 | The default should be working \s-1OK\s0 for most links. |
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308 | .IP "dns-overlap-factor = float" 4 |
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309 | .IX Item "dns-overlap-factor = float" |
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310 | The \s-1DNS\s0 transport uses the minimum request latency (\fBmin_latency\fR) seen |
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311 | during a connection as it's timing base. This factor (default: \f(CW0.5\fR, |
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312 | must be > 0) is multiplied by \fBmin_latency\fR to get the maximum sending |
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313 | rate (= minimum send interval), i.e. a factor of \f(CW1\fR means that a new |
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314 | request might be generated every \fBmin_latency\fR seconds, which means on |
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315 | average there should only ever be one outstanding request. A factor of |
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316 | \&\f(CW0.5\fR means that \s-1GVPE\s0 will send requests twice as often as the minimum |
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317 | latency measured. |
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318 | .Sp |
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319 | For congested or picky \s-1DNS\s0 forwarders you could use a value nearer to or |
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320 | exceeding \f(CW1\fR. |
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321 | .Sp |
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322 | The default should be working \s-1OK\s0 for most links. |
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323 | .IP "dns-send-interval = send-interval-in-seconds" 4 |
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324 | .IX Item "dns-send-interval = send-interval-in-seconds" |
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325 | The minimum send interval (= maximum rate) that the \s-1DNS\s0 transport will |
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326 | use to send new \s-1DNS\s0 requests. \s-1GVPE\s0 will not exceed this rate even when |
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327 | the latency is very low. The default is \f(CW0.01\fR, which means \s-1GVPE\s0 will |
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328 | not send more than 100 \s-1DNS\s0 requests per connection per second. For |
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329 | high-bandwidth links you could go lower, e.g. to \f(CW0.001\fR or so. For |
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330 | congested or rate-limited links, you might want to go higher, say \f(CW0.1\fR, |
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331 | \&\f(CW0.2\fR or even higher. |
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332 | .Sp |
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333 | The default should be working \s-1OK\s0 for most links. |
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334 | .IP "dns-timeout-factor = float" 4 |
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335 | .IX Item "dns-timeout-factor = float" |
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336 | 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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337 | get request timeouts. The default of \f(CW8\fR means that the \s-1DNS\s0 transport |
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338 | will resend the request when no reply has been received for longer than |
|
|
339 | eight times the minimum (= expected) latency, assuming the request or |
|
|
340 | reply has been lost. |
|
|
341 | .Sp |
|
|
342 | For congested links a higher value might be necessary (e.g. \f(CW30\fR). If |
|
|
343 | the link is very stable lower values (e.g. \f(CW2\fR) might work |
|
|
344 | nicely. Values near or below \f(CW1\fR makes no sense whatsoever. |
|
|
345 | .Sp |
|
|
346 | The default should be working \s-1OK\s0 for most links but will result in low |
|
|
347 | throughput if packet loss is high. |
|
|
348 | .IP "if-up = relative-or-absolute-path" 4 |
|
|
349 | .IX Item "if-up = relative-or-absolute-path" |
|
|
350 | Sets the path of a script that should be called immediately after the |
|
|
351 | network interface is initialized (but not necessarily up). The following |
|
|
352 | environment variables are passed to it (the values are just examples). |
|
|
353 | .Sp |
|
|
354 | Variables that have the same value on all nodes: |
|
|
355 | .RS 4 |
|
|
356 | .IP "CONFBASE=/etc/gvpe" 4 |
|
|
357 | .IX Item "CONFBASE=/etc/gvpe" |
|
|
358 | The configuration base directory. |
|
|
359 | .IP "IFNAME=vpn0" 4 |
|
|
360 | .IX Item "IFNAME=vpn0" |
|
|
361 | The network interface to initialize. |
|
|
362 | .IP "IFTYPE=native # or tincd" 4 |
|
|
363 | .IX Item "IFTYPE=native # or tincd" |
|
|
364 | .PD 0 |
|
|
365 | .IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4 |
|
|
366 | .IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.." |
|
|
367 | .PD |
|
|
368 | The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the |
|
|
369 | \&\s-1OS\s0 name in lowercase) that this \s-1GVPE\s0 was configured for. Can be used to |
|
|
370 | select the correct syntax to use for network-related commands. |
|
|
371 | .IP "MTU=1436" 4 |
|
|
372 | .IX Item "MTU=1436" |
|
|
373 | The \s-1MTU\s0 to set the interface to. You can use lower values (if done |
|
|
374 | consistently on all nodes), but this is usually either inefficient or |
|
|
375 | simply ineffective. |
|
|
376 | .IP "NODES=5" 4 |
|
|
377 | .IX Item "NODES=5" |
|
|
378 | The number of nodes in this \s-1GVPE\s0 network. |
|
|
379 | .RE |
|
|
380 | .RS 4 |
|
|
381 | .Sp |
|
|
382 | Variables that are node-specific and with values pertaining to the node |
|
|
383 | running this \s-1GVPE:\s0 |
|
|
384 | .IP "IFUPDATA=string" 4 |
|
|
385 | .IX Item "IFUPDATA=string" |
|
|
386 | The value of the configuration directive \f(CW\*(C`if\-up\-data\*(C'\fR. |
|
|
387 | .IP "MAC=fe:fd:80:00:00:01" 4 |
|
|
388 | .IX Item "MAC=fe:fd:80:00:00:01" |
|
|
389 | The \s-1MAC\s0 address the network interface has to use. |
|
|
390 | .Sp |
|
|
391 | Might be used to initialize interfaces on platforms where \s-1GVPE\s0 does not |
|
|
392 | do this automatically. Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR man page for |
|
|
393 | platform-specific information. |
|
|
394 | .IP "NODENAME=branch1" 4 |
|
|
395 | .IX Item "NODENAME=branch1" |
|
|
396 | The nickname of the node. |
|
|
397 | .IP "NODEID=1" 4 |
|
|
398 | .IX Item "NODEID=1" |
|
|
399 | The numerical node \s-1ID\s0 of the node running this instance of \s-1GVPE.\s0 The first |
|
|
400 | node mentioned in the config file gets \s-1ID 1,\s0 the second \s-1ID 2\s0 and so on. |
|
|
401 | .RE |
|
|
402 | .RS 4 |
|
|
403 | .Sp |
|
|
404 | In addition, all node-specific variables (except \f(CW\*(C`NODEID\*(C'\fR) will be |
|
|
405 | available with a postfix of \f(CW\*(C`_nodeid\*(C'\fR, which contains the value for that |
|
|
406 | node, e.g. the \f(CW\*(C`MAC_1\*(C'\fR variable contains the \s-1MAC\s0 address of node #1, while |
|
|
407 | the \f(CW\*(C`NODENAME_22\*(C'\fR variable contains the name of node #22. |
|
|
408 | .Sp |
|
|
409 | Here is a simple if-up script: |
|
|
410 | .Sp |
|
|
411 | .Vb 5 |
|
|
412 | \& #!/bin/sh |
|
|
413 | \& ip link set $IFNAME up |
|
|
414 | \& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
|
|
415 | \& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
|
|
416 | \& ip route add 10.0.0.0/8 dev $IFNAME |
|
|
417 | .Ve |
|
|
418 | .Sp |
|
|
419 | More complicated examples (using routing to reduce \s-1ARP\s0 traffic) can be |
|
|
420 | found in the \fIetc/\fR subdirectory of the distribution. |
|
|
421 | .RE |
|
|
422 | .IP "ifname = devname" 4 |
|
|
423 | .IX Item "ifname = devname" |
|
|
424 | Sets the tun interface name to the given name. The default is OS-specific |
|
|
425 | and most probably something like \f(CW\*(C`tun0\*(C'\fR. |
|
|
426 | .IP "ifpersist = yes|true|on | no|false|off" 4 |
|
|
427 | .IX Item "ifpersist = yes|true|on | no|false|off" |
|
|
428 | Should the tun/tap device be made persistent, that is, should the device |
|
|
429 | stay up even when gvpe exits? Some versions of the tunnel device have |
|
|
430 | problems sending packets when gvpe is restarted in persistent mode, so |
|
|
431 | if the connections can be established but you cannot send packets from |
|
|
432 | the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the |
|
|
433 | device. |
|
|
434 | .IP "ip-proto = numerical-ip-protocol" 4 |
|
|
435 | .IX Item "ip-proto = numerical-ip-protocol" |
|
|
436 | Sets the protocol number to be used for the rawip protocol. This is a |
|
|
437 | global option because all nodes must use the same protocol, and since |
|
|
438 | there are no port numbers, you cannot easily run more than one gvpe |
|
|
439 | instance using the same protocol, nor can you share the protocol with |
|
|
440 | other programs. |
|
|
441 | .Sp |
|
|
442 | The default is 47 (\s-1GRE\s0), which has a good chance of tunneling |
|
|
443 | through firewalls (but note that gvpe's rawip protocol is not \s-1GRE\s0 |
|
|
444 | compatible). Other common choices are 50 (\s-1IPSEC, ESP\s0), 51 (\s-1IPSEC, AH\s0), 4 |
|
|
445 | (\s-1IPIP\s0 tunnels) or 98 (\s-1ENCAP,\s0 rfc1241). |
|
|
446 | .Sp |
|
|
447 | Many versions of Linux seem to have a bug that causes them to reorder |
|
|
448 | packets for some ip protocols (\s-1GRE, ESP\s0) but not for others (\s-1AH\s0), so |
|
|
449 | choose wisely (that is, use 51, \s-1AH\s0). |
|
|
450 | .IP "http-proxy-host = hostname/ip" 4 |
|
|
451 | .IX Item "http-proxy-host = hostname/ip" |
|
|
452 | The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was |
|
|
453 | compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of |
|
|
454 | tcp connections through a http proxy server. |
|
|
455 | .Sp |
|
|
456 | \&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and |
|
|
457 | port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy |
|
|
458 | requires authentication. |
|
|
459 | .Sp |
|
|
460 | Please note that gvpe will still try to resolve all hostnames in the |
|
|
461 | configuration file, so if you are behind a proxy without access to a \s-1DNS\s0 |
|
|
462 | server better use numerical \s-1IP\s0 addresses. |
|
|
463 | .Sp |
|
|
464 | To make best use of this option disable all protocols except \s-1TCP\s0 in your |
|
|
465 | config file and make sure your routers (or all other nodes) are listening |
|
|
466 | on a port that the proxy allows (443, https, is a common choice). |
|
|
467 | .Sp |
|
|
468 | If you have a router, connecting to it will suffice. Otherwise \s-1TCP\s0 must be |
|
|
469 | enabled on all nodes. |
|
|
470 | .Sp |
|
|
471 | Example: |
|
|
472 | .Sp |
|
|
473 | .Vb 3 |
|
|
474 | \& http\-proxy\-host = proxy.example.com |
|
|
475 | \& http\-proxy\-port = 3128 # 8080 is another common choice |
|
|
476 | \& http\-proxy\-auth = schmorp:grumbeere |
|
|
477 | .Ve |
|
|
478 | .IP "http-proxy-port = proxy-tcp-port" 4 |
|
|
479 | .IX Item "http-proxy-port = proxy-tcp-port" |
|
|
480 | The port where your proxy server listens. |
|
|
481 | .IP "http-proxy-auth = login:password" 4 |
|
|
482 | .IX Item "http-proxy-auth = login:password" |
|
|
483 | The optional login and password used to authenticate to the proxy server, |
|
|
484 | separated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is |
|
|
485 | currently supported. |
|
|
486 | .IP "keepalive = seconds" 4 |
|
|
487 | .IX Item "keepalive = seconds" |
|
|
488 | Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this |
|
|
489 | many seconds of inactivity the daemon will start to send keepalive probe |
|
|
490 | every 3 seconds until it receives a reply from the other end. If no reply |
|
|
491 | is received within 15 seconds, the peer is considered unreachable and the |
|
|
492 | connection is closed. |
|
|
493 | .IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4 |
|
|
494 | .IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical" |
|
|
495 | Set the logging level. Connection established messages are logged at level |
|
|
496 | \&\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. |
|
|
497 | .IP "mtu = bytes" 4 |
|
|
498 | .IX Item "mtu = bytes" |
|
|
499 | Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically |
|
|
500 | the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate |
|
|
501 | maximum overhead (e.g. \s-1UDP\s0 header size, encryption blocksize...) and pass |
|
|
502 | this information to the \f(CW\*(C`if\-up\*(C'\fR script. |
|
|
503 | .Sp |
|
|
504 | Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
|
|
505 | .Sp |
|
|
506 | This value must be the minimum of the \s-1MTU\s0 values of all nodes. |
|
|
507 | .IP "nfmark = integer" 4 |
|
|
508 | .IX Item "nfmark = integer" |
|
|
509 | This advanced option, when set to a nonzero value (default: \f(CW0\fR), tries |
|
|
510 | to set the netfilter mark (or fwmark) value on all sockets gvpe uses to |
|
|
511 | send packets. |
|
|
512 | .Sp |
|
|
513 | This can be used to make gvpe use a different set of routing rules. For |
|
|
514 | example, on GNU/Linux, the \f(CW\*(C`if\-up\*(C'\fR could set \f(CW\*(C`nfmark\*(C'\fR to 1000 and then |
|
|
515 | put all routing rules into table \f(CW99\fR and then use an ip rule to make |
|
|
516 | gvpe traffic avoid that routing table, in effect routing normal traffic |
|
|
517 | via gvpe and gvpe traffic via the normal system routing tables: |
|
|
518 | .Sp |
|
|
519 | .Vb 1 |
|
|
520 | \& ip rule add not fwmark 1000 lookup 99 |
|
|
521 | .Ve |
|
|
522 | .IP "node-up = relative-or-absolute-path" 4 |
|
|
523 | .IX Item "node-up = relative-or-absolute-path" |
|
|
524 | Sets a command (default: none) that should be called whenever a connection |
|
|
525 | is established (even on rekeying operations). Note that node\-up/down |
|
|
526 | scripts will be run asynchronously, but execution is serialised, so there |
|
|
527 | will only ever be one such script running. |
|
|
528 | .Sp |
|
|
529 | In addition to all the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following |
|
|
530 | environment variables will be set (values are just examples): |
|
|
531 | .RS 4 |
|
|
532 | .IP "DESTNODE=branch2" 4 |
|
|
533 | .IX Item "DESTNODE=branch2" |
|
|
534 | The name of the remote node. |
|
|
535 | .IP "DESTID=2" 4 |
|
|
536 | .IX Item "DESTID=2" |
|
|
537 | The node id of the remote node. |
|
|
538 | .IP "DESTSI=rawip/88.99.77.55:0" 4 |
|
|
539 | .IX Item "DESTSI=rawip/88.99.77.55:0" |
|
|
540 | The \*(L"socket info\*(R" of the target node, protocol dependent but usually in |
|
|
541 | the format protocol/ip:port. |
|
|
542 | .IP "DESTIP=188.13.66.8" 4 |
|
|
543 | .IX Item "DESTIP=188.13.66.8" |
|
|
544 | The numerical \s-1IP\s0 address of the remote node (gvpe accepts connections from |
|
|
545 | everywhere, as long as the other node can authenticate itself). |
|
|
546 | .IP "DESTPORT=655 # deprecated" 4 |
|
|
547 | .IX Item "DESTPORT=655 # deprecated" |
|
|
548 | The protocol port used by the other side, if applicable. |
|
|
549 | .IP "STATE=up" 4 |
|
|
550 | .IX Item "STATE=up" |
|
|
551 | Node-up scripts get called with STATE=up, node-change scripts get called |
|
|
552 | with STATE=change and node-down scripts get called with STATE=down. |
|
|
553 | .RE |
|
|
554 | .RS 4 |
|
|
555 | .Sp |
|
|
556 | Here is a nontrivial example that uses nsupdate to update the name => ip |
|
|
557 | mapping in some \s-1DNS\s0 zone: |
|
|
558 | .Sp |
|
|
559 | .Vb 6 |
|
|
560 | \& #!/bin/sh |
|
|
561 | \& { |
|
|
562 | \& echo update delete $DESTNODE.lowttl.example.net. a |
|
|
563 | \& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
|
|
564 | \& echo |
|
|
565 | \& } | nsupdate \-d \-k $CONFBASE:key.example.net. |
|
|
566 | .Ve |
|
|
567 | .RE |
|
|
568 | .IP "node-change = relative-or-absolute-path" 4 |
|
|
569 | .IX Item "node-change = relative-or-absolute-path" |
|
|
570 | Same as \f(CW\*(C`node\-change\*(C'\fR, but gets called whenever something about a |
|
|
571 | connection changes (such as the source \s-1IP\s0 address). |
|
|
572 | .IP "node-down = relative-or-absolute-path" 4 |
|
|
573 | .IX Item "node-down = relative-or-absolute-path" |
|
|
574 | Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost. |
|
|
575 | .IP "pid-file = path" 4 |
|
|
576 | .IX Item "pid-file = path" |
|
|
577 | The path to the pid file to check and create |
|
|
578 | (default: \f(CW\*(C`LOCALSTATEDIR/run/gvpe.pid\*(C'\fR). The first \f(CW%s\fR is replaced by |
|
|
579 | the nodename \- any other use of \f(CW\*(C`%\*(C'\fR must be written as \f(CW\*(C`%%\*(C'\fR. |
|
|
580 | .IP "private-key = relative-path-to-key" 4 |
|
|
581 | .IX Item "private-key = relative-path-to-key" |
|
|
582 | Sets the path (relative to the config directory) to the private key |
|
|
583 | (default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must |
|
|
584 | be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could use |
|
|
585 | paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to be able to share the same config directory |
|
|
586 | between nodes. |
|
|
587 | .Sp |
|
|
588 | Since only the private key file of the current node is used and the |
|
|
589 | private key file should be kept secret per-node to avoid spoofing, it is |
|
|
590 | not recommended to use this feature this way though. |
|
|
591 | .IP "rekey = seconds" 4 |
|
|
592 | .IX Item "rekey = seconds" |
|
|
593 | Sets the rekeying interval in seconds (default: \f(CW3607\fR). Connections are |
|
|
594 | reestablished every \f(CW\*(C`rekey\*(C'\fR seconds, making them use a new encryption |
|
|
595 | key. |
|
|
596 | .IP "seed-device = path" 4 |
|
|
597 | .IX Item "seed-device = path" |
|
|
598 | The random device used to initially and regularly seed the random |
|
|
599 | number generator (default: \fI/dev/urandom\fR). Randomness is of paramount |
|
|
600 | importance to the security of the algorithms used in gvpe. |
|
|
601 | .Sp |
|
|
602 | On program start and every seed-interval, gvpe will read 64 octets. |
|
|
603 | .Sp |
|
|
604 | Setting this path to the empty string will disable this functionality |
|
|
605 | completely (the underlying crypto library will likely look for entropy |
|
|
606 | sources on it's own though, so not all is lost). |
|
|
607 | .IP "seed-interval = seconds" 4 |
|
|
608 | .IX Item "seed-interval = seconds" |
|
|
609 | The number of seconds between reseeds of the random number generator |
|
|
610 | (default: \f(CW3613\fR). A value of \f(CW0\fR disables this regular reseeding. |
|
|
611 | .IP "serial = string" 4 |
|
|
612 | .IX Item "serial = string" |
|
|
613 | The configuration serial number. This can be any string up to 16 bytes |
|
|
614 | length. Only when the serial matches on both sides of a connection will |
|
|
615 | the connection succeed. This is \fInot\fR a security mechanism and eay to |
|
|
616 | spoof, this mechanism exists to alert users that their config is outdated. |
|
|
617 | .Sp |
|
|
618 | It's recommended to specify this is a date string such as \f(CW\*(C`2013\-05\-05\*(C'\fR or |
|
|
619 | \&\f(CW20121205084417\fR. |
|
|
620 | .Sp |
|
|
621 | The exact algorithm is as this: if a connection request is received form a |
|
|
622 | node with an identical serial, then it succeeds normally. |
|
|
623 | .Sp |
|
|
624 | If the remote serial is lower than the local serial, it is ignored. |
|
|
625 | .Sp |
|
|
626 | If the remote serial is higher than the local serial, a warning message is |
|
|
627 | logged. |
|
|
628 | .SS "\s-1NODE SPECIFIC SETTINGS\s0" |
|
|
629 | .IX Subsection "NODE SPECIFIC SETTINGS" |
|
|
630 | The following settings are node-specific, that is, every node can have |
|
|
631 | different settings, even within the same gvpe instance. Settings that are |
|
|
632 | set before the first node section set the defaults, settings that are |
|
|
633 | set within a node section only apply to the given node. |
|
|
634 | .IP "allow-direct = nodename" 4 |
|
|
635 | .IX Item "allow-direct = nodename" |
|
|
636 | Allow direct connections to this node. See \f(CW\*(C`deny\-direct\*(C'\fR for more info. |
|
|
637 | .IP "compress = yes|true|on | no|false|off" 4 |
|
|
638 | .IX Item "compress = yes|true|on | no|false|off" |
|
|
639 | For the current node, this specified whether it will accept compressed |
|
|
640 | packets, and for all other nodes, this specifies whether to try to |
|
|
641 | compress data packets sent to this node (default: \f(CW\*(C`yes\*(C'\fR). Compression is |
|
|
642 | really cheap even on slow computers, has no size overhead at all and will |
|
|
643 | only be used when the other side supports compression, so enabling this is |
|
|
644 | often a good idea. |
|
|
645 | .IP "connect = ondemand | never | always | disabled" 4 |
|
|
646 | .IX Item "connect = ondemand | never | always | disabled" |
|
|
647 | Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always |
|
|
648 | try to establish and keep a connection to the given node), \f(CW\*(C`never\*(C'\fR |
|
|
649 | (never initiate a connection to the given host, but accept connections), |
|
|
650 | \&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection when there are outstanding |
|
|
651 | packets in the queue and take it down after the keepalive interval) or |
|
|
652 | \&\f(CW\*(C`disabled\*(C'\fR (node is bad, don't talk to it). |
|
|
653 | .Sp |
|
|
654 | Routers will automatically be forced to \f(CW\*(C`always\*(C'\fR unless they are |
|
|
655 | \&\f(CW\*(C`disabled\*(C'\fR, to ensure all nodes can talk to each other. |
|
|
656 | .IP "deny-direct = nodename | *" 4 |
|
|
657 | .IX Item "deny-direct = nodename | *" |
|
|
658 | Deny direct connections to the specified node (or all nodes when \f(CW\*(C`*\*(C'\fR |
|
|
659 | is given). Only one node can be specified, but you can use multiple |
|
|
660 | \&\f(CW\*(C`allow\-direct\*(C'\fR and \f(CW\*(C`deny\-direct\*(C'\fR statements. This only makes sense in |
|
|
661 | networks with routers, as routers are required for indirect connections. |
|
|
662 | .Sp |
|
|
663 | Sometimes, a node cannot reach some other nodes for reasons of network |
|
|
664 | connectivity. For example, a node behind a firewall that only allows |
|
|
665 | connections to/from a single other node in the network. In this case one |
|
|
666 | should specify \f(CW\*(C`deny\-direct = *\*(C'\fR and \f(CW\*(C`allow\-direct = othernodename\*(C'\fR (the other |
|
|
667 | node \fImust\fR be a router for this to work). |
|
|
668 | .Sp |
|
|
669 | The algorithm to check whether a connection may be direct is as follows: |
|
|
670 | .Sp |
|
|
671 | 1. Other node mentioned in an \f(CW\*(C`allow\-direct\*(C'\fR? If yes, allow the connection. |
|
|
672 | .Sp |
|
|
673 | 2. Other node mentioned in a \f(CW\*(C`deny\-direct\*(C'\fR? If yes, deny direct connections. |
|
|
674 | .Sp |
|
|
675 | 3. Allow the connection. |
|
|
676 | .Sp |
|
|
677 | That is, \f(CW\*(C`allow\-direct\*(C'\fR takes precedence over \f(CW\*(C`deny\-direct\*(C'\fR. |
|
|
678 | .Sp |
|
|
679 | The check is done in both directions, i.e. both nodes must allow a direct |
|
|
680 | connection before one is attempted, so you only need to specify connect |
|
|
681 | limitations on one node. |
|
|
682 | .IP "dns-domain = domain-suffix" 4 |
|
|
683 | .IX Item "dns-domain = domain-suffix" |
|
|
684 | The \s-1DNS\s0 domain suffix that points to the \s-1DNS\s0 tunnel server for this node. |
|
|
685 | .Sp |
|
|
686 | The domain must point to a \s-1NS\s0 record that points to the \fIdns-hostname\fR, |
|
|
687 | i.e. |
|
|
688 | .Sp |
|
|
689 | .Vb 2 |
|
|
690 | \& dns\-domainname = tunnel.example.net |
|
|
691 | \& dns\-hostname = tunnel\-server.example.net |
|
|
692 | .Ve |
|
|
693 | .Sp |
|
|
694 | Corresponds to the following \s-1DNS\s0 entries in the \f(CW\*(C`example.net\*(C'\fR domain: |
|
|
695 | .Sp |
|
|
696 | .Vb 2 |
|
|
697 | \& tunnel.example.net. NS tunnel\-server.example.net. |
|
|
698 | \& tunnel\-server.example.net. A 13.13.13.13 |
|
|
699 | .Ve |
|
|
700 | .IP "dns-hostname = hostname/ip" 4 |
|
|
701 | .IX Item "dns-hostname = hostname/ip" |
|
|
702 | The address to bind the \s-1DNS\s0 tunnel socket to, similar to the \f(CW\*(C`hostname\*(C'\fR, |
|
|
703 | but for the \s-1DNS\s0 tunnel protocol only. Default: \f(CW0.0.0.0\fR, but that might |
|
|
704 | change. |
|
|
705 | .IP "dns-port = port-number" 4 |
|
|
706 | .IX Item "dns-port = port-number" |
|
|
707 | The port to bind the \s-1DNS\s0 tunnel socket to. Must be \f(CW53\fR on \s-1DNS\s0 tunnel servers. |
|
|
708 | .IP "enable-dns = yes|true|on | no|false|off" 4 |
|
|
709 | .IX Item "enable-dns = yes|true|on | no|false|off" |
|
|
710 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1DNS\s0 transport |
|
|
711 | protocol. Avoid this protocol if you can. |
|
|
712 | .Sp |
|
|
713 | Enable the \s-1DNS\s0 tunneling protocol on this node, either as server or as |
|
|
714 | client. Support for this transport protocol is only available when gvpe |
|
|
715 | was compiled using the \f(CW\*(C`\-\-enable\-dns\*(C'\fR option. |
|
|
716 | .IP "enable-icmp = yes|true|on | no|false|off" 4 |
|
|
717 | .IX Item "enable-icmp = yes|true|on | no|false|off" |
|
|
718 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1ICMP\s0 transport protocol. |
|
|
719 | .Sp |
|
|
720 | Enable the \s-1ICMP\s0 transport using \s-1ICMP\s0 packets of type \f(CW\*(C`icmp\-type\*(C'\fR on this |
|
|
721 | node. |
|
|
722 | .IP "enable-rawip = yes|true|on | no|false|off" 4 |
|
|
723 | .IX Item "enable-rawip = yes|true|on | no|false|off" |
|
|
724 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1RAW IP\s0 transport protocol. |
|
|
725 | .Sp |
|
|
726 | Enable the \s-1RAW\s0 IPv4 transport using the \f(CW\*(C`ip\-proto\*(C'\fR protocol |
|
|
727 | (default: \f(CW\*(C`no\*(C'\fR). |
|
|
728 | .IP "enable-tcp = yes|true|on | no|false|off" 4 |
|
|
729 | .IX Item "enable-tcp = yes|true|on | no|false|off" |
|
|
730 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1TCP\s0 transport protocol. |
|
|
731 | .Sp |
|
|
732 | Enable the TCPv4 transport using the \f(CW\*(C`tcp\-port\*(C'\fR port |
|
|
733 | (default: \f(CW\*(C`no\*(C'\fR). Support for this transport protocol is only available |
|
|
734 | when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option. |
|
|
735 | .IP "enable-udp = yes|true|on | no|false|off" 4 |
|
|
736 | .IX Item "enable-udp = yes|true|on | no|false|off" |
|
|
737 | See \fIgvpe.protocol\fR\|(7) for a description of the \s-1UDP\s0 transport protocol. |
|
|
738 | .Sp |
|
|
739 | Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`no\*(C'\fR). |
|
|
740 | .IP "hostname = hostname | ip [can not be defaulted]" 4 |
|
|
741 | .IX Item "hostname = hostname | ip [can not be defaulted]" |
|
|
742 | Forces the address of this node to be set to the given \s-1DNS\s0 hostname or \s-1IP\s0 |
|
|
743 | address. It will be resolved before each connect request, so dyndns should |
|
|
744 | work fine. If this setting is not specified and a router is available, |
|
|
745 | then the router will be queried for the address of this node. Otherwise, |
|
|
746 | the connection attempt will fail. |
|
|
747 | .Sp |
|
|
748 | Note that \s-1DNS\s0 resolving is done synchronously, pausing the daemon. If that |
|
|
749 | is an issue you need to specify \s-1IP\s0 addresses. |
|
|
750 | .IP "icmp-type = integer" 4 |
|
|
751 | .IX Item "icmp-type = integer" |
|
|
752 | Sets the type value to be used for outgoing (and incoming) packets sent |
|
|
753 | via the \s-1ICMP\s0 transport. |
|
|
754 | .Sp |
|
|
755 | The default is \f(CW0\fR (which is \f(CW\*(C`echo\-reply\*(C'\fR, also known as |
|
|
756 | \&\*(L"ping-reply\*(R"). Other useful values include \f(CW8\fR (\f(CW\*(C`echo\-request\*(C'\fR, a.k.a. |
|
|
757 | \&\*(L"ping\*(R") and \f(CW11\fR (\f(CW\*(C`time\-exceeded\*(C'\fR), but any 8\-bit value can be used. |
|
|
758 | .IP "if-up-data = value" 4 |
|
|
759 | .IX Item "if-up-data = value" |
|
|
760 | The value specified using this directive will be passed to the \f(CW\*(C`if\-up\*(C'\fR |
|
|
761 | script in the environment variable \f(CW\*(C`IFUPDATA\*(C'\fR. |
|
|
762 | .IP "inherit-tos = yes|true|on | no|false|off" 4 |
|
|
763 | .IX Item "inherit-tos = yes|true|on | no|false|off" |
|
|
764 | Whether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when |
|
|
765 | sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then |
|
|
766 | outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent |
|
|
767 | to the tunnel device, which is usually what you want. |
|
|
768 | .IP "low-power = yes|true|on | no|false|off" 4 |
|
|
769 | .IX Item "low-power = yes|true|on | no|false|off" |
|
|
770 | If true, designates a node as a low-power node. Low-power nodes use |
|
|
771 | larger timeouts and try to reduce cpu time. Other nodes talking to a |
|
|
772 | low-power node will also use larger timeouts, and will use less aggressive |
|
|
773 | optimisations, in the hope of reducing load. Security is not compromised. |
|
|
774 | .Sp |
|
|
775 | The typical low-power node would be a mobile phone, where wakeups and |
|
|
776 | encryption can significantly increase power drain. |
|
|
777 | .IP "max-retry = positive-number" 4 |
|
|
778 | .IX Item "max-retry = positive-number" |
|
|
779 | The maximum interval in seconds (default: \f(CW3600\fR, one hour) between |
|
|
780 | retries to establish a connection to this node. When a connection cannot |
|
|
781 | be established, gvpe uses exponential back-off capped at this value. It's |
|
|
782 | sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on |
|
|
783 | connections to routers that usually are stable but sometimes are down, to |
|
|
784 | assure quick reconnections even after longer downtimes. |
|
|
785 | .IP "max-ttl = seconds" 4 |
|
|
786 | .IX Item "max-ttl = seconds" |
|
|
787 | Expire packets that couldn't be sent after this many seconds |
|
|
788 | (default: \f(CW60\fR). Gvpe will normally queue packets for a node without an |
|
|
789 | active connection, in the hope of establishing a connection soon. This |
|
|
790 | value specifies the maximum lifetime a packet will stay in the queue, if a |
|
|
791 | packet gets older, it will be thrown away. |
|
|
792 | .IP "max-queue = positive\-number>=1" 4 |
|
|
793 | .IX Item "max-queue = positive-number>=1" |
|
|
794 | The maximum number of packets that will be queued (default: \f(CW512\fR) |
|
|
795 | for this node. If more packets are sent then earlier packets will be |
|
|
796 | expired. See \f(CW\*(C`max\-ttl\*(C'\fR, above. |
|
|
797 | .IP "router-priority = 0 | 1 | positive\-number>=2" 4 |
|
|
798 | .IX Item "router-priority = 0 | 1 | positive-number>=2" |
|
|
799 | Sets the router priority of the given node (default: \f(CW0\fR, disabled). |
|
|
800 | .Sp |
|
|
801 | If some node tries to connect to another node but it doesn't have a |
|
|
802 | hostname, it asks a router node for it's \s-1IP\s0 address. The router node |
|
|
803 | chosen is the one with the highest priority larger than \f(CW1\fR that is |
|
|
804 | currently reachable. This is called a \fImediated\fR connection, as the |
|
|
805 | connection itself will still be direct, but it uses another node to |
|
|
806 | mediate between the two nodes. |
|
|
807 | .Sp |
|
|
808 | The value \f(CW0\fR disables routing, that means if the node receives a packet |
|
|
809 | not for itself it will not forward it but instead drop it. |
|
|
810 | .Sp |
|
|
811 | The special value \f(CW1\fR allows other hosts to route through the router |
|
|
812 | host, but they will never route through it by default (i.e. the config |
|
|
813 | file of another node needs to specify a router priority higher than one |
|
|
814 | to choose such a node for routing). |
|
|
815 | .Sp |
|
|
816 | The idea behind this is that some hosts can, if required, bump the |
|
|
817 | \&\f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their local config to |
|
|
818 | route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is \f(CW0\fR, then routing |
|
|
819 | will be refused, so \f(CW1\fR serves as a \*(L"enable, but do not use by default\*(R" |
|
|
820 | switch. |
|
|
821 | .Sp |
|
|
822 | Nodes with \f(CW\*(C`router\-priority\*(C'\fR set to \f(CW2\fR or higher will always be forced |
|
|
823 | to \f(CW\*(C`connect\*(C'\fR = \f(CW\*(C`always\*(C'\fR (unless they are \f(CW\*(C`disabled\*(C'\fR). |
|
|
824 | .IP "tcp-port = port-number" 4 |
|
|
825 | .IX Item "tcp-port = port-number" |
|
|
826 | Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number. |
|
|
827 | .IP "udp-port = port-number" 4 |
|
|
828 | .IX Item "udp-port = port-number" |
|
|
829 | Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not |
|
|
830 | officially assigned by \s-1IANA\s0!). |
|
|
831 | .SH "CONFIG DIRECTORY LAYOUT" |
|
|
832 | .IX Header "CONFIG DIRECTORY LAYOUT" |
|
|
833 | The default (or recommended) directory layout for the config directory is: |
|
|
834 | .IP "gvpe.conf" 4 |
|
|
835 | .IX Item "gvpe.conf" |
|
|
836 | The config file. |
|
|
837 | .IP "if-up" 4 |
|
|
838 | .IX Item "if-up" |
|
|
839 | The if-up script |
|
|
840 | .IP "node-up, node-down" 4 |
|
|
841 | .IX Item "node-up, node-down" |
|
|
842 | If used the node up or node-down scripts. |
|
|
843 | .IP "hostkey" 4 |
|
|
844 | .IX Item "hostkey" |
|
|
845 | The (default path of the) private key of the current host. |
|
|
846 | .IP "pubkey/nodename" 4 |
|
|
847 | .IX Item "pubkey/nodename" |
|
|
848 | The public keys of the other nodes, one file per node. |
|
|
849 | .SH "SEE ALSO" |
|
|
850 | .IX Header "SEE ALSO" |
|
|
851 | \&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8). |
|
|
852 | .SH "AUTHOR" |
|
|
853 | .IX Header "AUTHOR" |
|
|
854 | Marc Lehmann <gvpe@schmorp.de> |
