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Revision: 1.5
Committed: Tue Feb 22 23:00:57 2005 UTC (19 years, 3 months ago) by pcg
Branch: MAIN
CVS Tags: rel-1_7
Changes since 1.4: +1 -1 lines
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File Contents

# User Rev Content
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131     .IX Title "GVPE.CONF 5"
132 pcg 1.5 .TH GVPE.CONF 5 "2005-02-22" "1.7" "GNU Virtual Private Ethernet"
133 pcg 1.1 .SH "NAME"
134     gvpe.conf \- configuration file for the GNU VPE daemon
135     .SH "SYNOPSIS"
136     .IX Header "SYNOPSIS"
137     .Vb 4
138     \& enable-udp = yes
139     \& udp-port = 407
140     \& mtu = 1492
141     \& ifname = vpn0
142     .Ve
143     .PP
144     .Vb 2
145     \& node = branch1
146     \& hostname = 1.2.3.4
147     .Ve
148     .PP
149     .Vb 3
150     \& node = branch2
151     \& hostname = www.example.net
152     \& udp-port = 500 # this host uses a different udp-port
153     .Ve
154     .PP
155     .Vb 2
156     \& node = branch3
157     \& connect = ondemand
158     .Ve
159     .SH "DESCRIPTION"
160     .IX Header "DESCRIPTION"
161     The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable
162     = value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR and
163     extend to the end of the line. They can be used on their own lines, or
164     after any directives. Spaces are allowed before or after the \f(CW\*(C`=\*(C'\fR sign or
165     after values, but not within the variable names or values themselves.
166     .PP
167     The only exception to the above is the \*(L"on\*(R" directive that can prefix any
168     \&\f(CW\*(C`name = value\*(C'\fR setting and will only \*(L"execute\*(R" it on the named node, or
169     (if the nodename starts with \*(L"!\*(R") on all nodes except the named one.
170     .PP
171     .Vb 3
172     \& name = value
173     \& on branch1 loglevel = noise
174     \& on !branch2 connect = ondemand
175     .Ve
176     .PP
177     All settings are executed \*(L"in order\*(R", that is, later settings of the same
178     variable overwrite earlier ones.
179     .SH "ANATOMY OF A CONFIG FILE"
180     .IX Header "ANATOMY OF A CONFIG FILE"
181     Usually, a config file starts with global settings (like the udp port to
182     listen on), followed by node-specific sections that begin with a \f(CW\*(C`node =
183     nickname\*(C'\fR line.
184     .PP
185     Every node that is part of the network must have a section that starts
186     with \f(CW\*(C`node = nickname\*(C'\fR. The number and order of the nodes is important
187     and must be the same on all hosts. It is not uncommon for node sections to
188     be completely empty \- if the default values are right.
189     .PP
190     Node-specific settings can be used at any time. If used before the first
191     node section they will set the default values for all following nodes.
192     .SH "CONFIG VARIABLES"
193     .IX Header "CONFIG VARIABLES"
194     .Sh "\s-1GLOBAL\s0 \s-1SETTINGS\s0"
195     .IX Subsection "GLOBAL SETTINGS"
196     Global settings will affect the behaviour of the running gvpe daemon, that
197     is, they are in some sense node-specific (config files can set different
198     values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of
199     the gvpe daemon and all connections it creates.
200     .IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4
201     .IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical"
202     Set the logging level. Connection established messages are logged at level
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.
204     .IP "node = nickname" 4
205     .IX Item "node = nickname"
206     Not really a config setting but introduces a node section. The nickname is
207     used to select the right configuration section and must be passed as an
208     argument to the gvpe daemon.
209     .IP "private-key = relative-path-to-key" 4
210     .IX Item "private-key = relative-path-to-key"
211     Sets the path (relative to the config directory) to the private key
212     (default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must
213     be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could
214     use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where
215     \&\f(CW\*(C`gvpectrl\*(C'\fR puts them.
216     .Sp
217     Since only the private key file of the current node is used and the
218     private key file should be kept secret per-host to avoid spoofings, it is
219     not recommended to use this feature.
220     .IP "ifpersist = yes|true|on | no|false|off" 4
221     .IX Item "ifpersist = yes|true|on | no|false|off"
222     Should the tun/tap device be made persistent, that is, should the device
223     stay up even when gvpe exits? Some versions of the tunnel device have
224     problems sending packets when gvpe is restarted in persistent mode, so
225     if the connections can be established but you cannot send packets from
226     the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the
227     device.
228     .IP "ifname = devname" 4
229     .IX Item "ifname = devname"
230     Sets the tun interface name to the given name. The default is OS-specific
231     and most probably something like \f(CW\*(C`tun0\*(C'\fR.
232     .IP "rekey = seconds" 4
233     .IX Item "rekey = seconds"
234     Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are
235     reestablished every \f(CW\*(C`rekey\*(C'\fR seconds.
236     .IP "keepalive = seconds" 4
237     .IX Item "keepalive = seconds"
238     Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this
239     many seconds of inactivity the daemon will start to send keepalive probe
240     every 5 seconds until it receives a reply from the other end. If no reply
241     is received within 30 seconds, the peer is considered unreachable and the
242     connection is closed.
243     .IP "mtu = bytes" 4
244     .IX Item "mtu = bytes"
245     Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically
246     the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate
247     maximum overhead (e.g. udp header size, encryption blocksize...) and pass
248     this information to the \f(CW\*(C`if\-up\*(C'\fR script.
249     .Sp
250     Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).
251     .Sp
252     This value must be the minimum of the mtu values of all hosts.
253     .IP "ip-proto = numerical-ip-protocol" 4
254     .IX Item "ip-proto = numerical-ip-protocol"
255     Sets the protocol number to be used for the rawip protocol. This is a
256     global option because all hosts must use the same protocol, and since
257     there are no port numbers, you cannot easily run more than one gvpe
258     instance using the same protocol, nor can you share the protocol with
259     other programs.
260     .Sp
261     The default is 47 (\s-1GRE\s0), which has a good chance of tunneling through
262     firewalls (but note that the rawip protocol is not \s-1GRE\s0 compatible). Other
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
264     (\s-1ENCAP\s0, rfc1241)
265     .IP "if-up = relative-or-absolute-path" 4
266     .IX Item "if-up = relative-or-absolute-path"
267     Sets the path of a script that should be called immediately after the
268     network interface is initialized (but not neccessarily up). The following
269     environment variables are passed to it (the values are just examples):
270     .RS 4
271     .IP "CONFBASE=/etc/gvpe" 4
272     .IX Item "CONFBASE=/etc/gvpe"
273     The configuration base directory.
274     .IP "IFNAME=vpn0" 4
275     .IX Item "IFNAME=vpn0"
276     The interface to initialize.
277     .IP "MTU=1436" 4
278     .IX Item "MTU=1436"
279     The \s-1MTU\s0 to set the interface to. You can use lower values (if done
280     consistently on all hosts), but this is usually ineffective.
281     .IP "MAC=fe:fd:80:00:00:01" 4
282     .IX Item "MAC=fe:fd:80:00:00:01"
283     The \s-1MAC\s0 address to set the interface to. The script *must* set the
284     interface \s-1MAC\s0 to this value. You will most likely use one of these:
285     .Sp
286     .Vb 2
287     \& ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux
288     \& ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD
289     .Ve
290     .Sp
291     Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR manpage for platform-specific information.
292     .IP "IFTYPE=native # or tincd" 4
293     .IX Item "IFTYPE=native # or tincd"
294     .PD 0
295     .IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4
296     .IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.."
297     .PD
298     The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the os
299     name in lowercase) that this gvpe was configured for. Can be used to select
300     the correct syntax to use for network-related commands.
301     .IP "NODENAME=branch1" 4
302     .IX Item "NODENAME=branch1"
303     The nickname of the current node, as passed to the gvpe daemon.
304     .IP "NODEID=1" 4
305     .IX Item "NODEID=1"
306     The numerical node id of the current node. The first node mentioned in the
307     config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on.
308     .RE
309     .RS 4
310     .Sp
311     Here is a simple if-up script:
312     .Sp
313     .Vb 5
314     \& #!/bin/sh
315     \& ip link set $IFNAME address $MAC mtu $MTU up
316     \& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
317     \& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
318     \& ip route add 10.0.0.0/8 dev $IFNAME
319     .Ve
320     .Sp
321     More complicated examples (using routing to reduce arp traffic) can be
322     found in the etc/ subdirectory of the distribution.
323     .RE
324     .IP "node-up = relative-or-absolute-path" 4
325     .IX Item "node-up = relative-or-absolute-path"
326     Sets a command (default: no script) that should be called whenever a
327     connection is established (even on rekeying operations). In addition
328     to the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following environment
329     variables will be set:
330     .RS 4
331     .IP "DESTNODE=branch2" 4
332     .IX Item "DESTNODE=branch2"
333     The name of the remote node.
334     .IP "DESTID=2" 4
335     .IX Item "DESTID=2"
336     The node id of the remote node.
337     .IP "DESTIP=188.13.66.8" 4
338     .IX Item "DESTIP=188.13.66.8"
339     The numerical \s-1IP\s0 address of the remote host (gvpe accepts connections from
340     everywhere, as long as the other host can authenticate itself).
341     .IP "DESTPORT=655 # deprecated" 4
342     .IX Item "DESTPORT=655 # deprecated"
343     The \s-1UDP\s0 port used by the other side.
344     .IP "STATE=UP" 4
345     .IX Item "STATE=UP"
346     Node-up scripts get called with STATE=UP, node-down scripts get called
347     with STATE=DOWN.
348     .RE
349     .RS 4
350     .Sp
351     Here is a nontrivial example that uses nsupdate to update the name => ip
352     mapping in some dns zone:
353     .Sp
354     .Vb 6
355     \& #!/bin/sh
356     \& {
357     \& echo update delete $DESTNODE.lowttl.example.net. a
358     \& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP
359     \& echo
360     \& } | nsupdate -d -k $CONFBASE:key.example.net.
361     .Ve
362     .RE
363     .IP "node-down = relative-or-absolute-path" 4
364     .IX Item "node-down = relative-or-absolute-path"
365     Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost.
366     .IP "http-proxy-host = hostname/ip" 4
367     .IX Item "http-proxy-host = hostname/ip"
368     The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was
369     compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of
370     tcp connections through a http proxy server.
371     .Sp
372     \&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and
373     port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy
374     requires authentication.
375     .Sp
376     Please note that gvpe will still try to resolve all hostnames in the
377     configuration file, so if you are behind a proxy without access to a dns
378     server better use numerical \s-1IP\s0 addresses.
379     .Sp
380     To make best use of this option disable all protocols except tcp in your
381     config file and make sure your routers (or all other hosts) are listening
382     on a port that the proxy allows (443, https, is a common choice).
383     .Sp
384     If you have a router, connecting to it will suffice. Otherwise tcp must be
385     enabled on all hosts.
386     .Sp
387     Example:
388     .Sp
389     .Vb 3
390     \& http-proxy-host = proxy.example.com
391     \& http-proxy-port = 3128 # 8080 is another common choice
392     \& http-proxy-auth = schmorp:grumbeere
393     .Ve
394     .IP "http-proxy-port = proxy-tcp-port" 4
395     .IX Item "http-proxy-port = proxy-tcp-port"
396     The port where your proxy server listens.
397     .IP "http-proxy-auth = login:password" 4
398     .IX Item "http-proxy-auth = login:password"
399     The optional login and password used to authenticate to the proxy server,
400     seperated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is
401     currently supported.
402     .IP "pid-file = path" 4
403     .IX Item "pid-file = path"
404     The path to the pid file to check and create (Default:
405     .Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0"
406     .IX Subsection "NODE SPECIFIC SETTINGS"
407     The following settings are node\-specific, that is, every node can have
408     different settings, even within the same gvpe instance. Settings that are
409     executed before the first node section set the defaults, settings that are
410     executed within a node section only apply to the given node.
411     .IP "udp-port = port-number" 4
412     .IX Item "udp-port = port-number"
413     Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not
414     officially assigned by \s-1IANA\s0!).
415     .IP "tcp-port = port-number" 4
416     .IX Item "tcp-port = port-number"
417     Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number.
418     .IP "enable-rawip = yes|true|on | no|false|off" 4
419     .IX Item "enable-rawip = yes|true|on | no|false|off"
420     Enable the \s-1RAW\s0 IPv4 transport using the \f(CW\*(C`ip\-proto\*(C'\fR protocol
421     (default: \f(CW\*(C`no\*(C'\fR). This is the best choice, since the overhead per packet
422     is only 38 bytes, as opposed to \s-1UDP\s0's 58 (or \s-1TCP\s0's 60+).
423     .IP "enable-udp = yes|true|on | no|false|off" 4
424     .IX Item "enable-udp = yes|true|on | no|false|off"
425     Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`yes\*(C'\fR,
426     but this will change!). This is a good general choice since \s-1UDP\s0 tunnels
427     well through many firewalls.
428     .Sp
429     \&\s-1NOTE:\s0 Please specify \f(CW\*(C`enable\-udp = yes\*(C'\fR even though it is the default, as
430     some future version will have all protocols disabled by default.
431     .IP "enable-tcp = yes|true|on | no|false|off" 4
432     .IX Item "enable-tcp = yes|true|on | no|false|off"
433     Enable the TCPv4 transport using the \f(CW\*(C`tcp\-port\*(C'\fR port
434     (default: \f(CW\*(C`no\*(C'\fR). Support for this horribly unsuitable protocol is only
435     available when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option. Never
436     use this transport unless you really must, it is horribly ineffiecent and
437     resource-intensive compared to the other transports.
438 pcg 1.2 .IP "router-priority = 0 | 1 | positive\-number>2" 4
439     .IX Item "router-priority = 0 | 1 | positive-number>2"
440 pcg 1.1 Sets the router priority of the given host (default: \f(CW0\fR, disabled). If
441     some host tries to connect to another host without a hostname, it asks
442     the router host for it's \s-1IP\s0 address. The router host is the one with the
443 pcg 1.2 highest priority larger than \f(CW1\fR that is currently reachable.
444     .Sp
445     Make sure all hosts always connect (\f(CW\*(C`connect = always\*(C'\fR) to the router
446     hosts, otherwise connecting to them might be impossible.
447     .Sp
448     The special value \f(CW1\fR allows other hosts to route through the router
449     host, but they will never route through it by default. The value \f(CW0\fR
450     disables routing. The idea behind this is that some hosts can, if
451     required, bump the \f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their
452     local config to route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is
453     \&\f(CW0\fR, then routing will be refused, so \f(CW1\fR serves as a \*(L"enable, but do
454     not use by default\*(R" switch.
455     .IP "connect = ondemand | never | always | disabled" 4
456     .IX Item "connect = ondemand | never | always | disabled"
457 pcg 1.1 Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always
458 pcg 1.2 try to establish and keep a connection to the given host), \f(CW\*(C`never\*(C'\fR
459 pcg 1.3 (never initiate a connection to the given host, but accept connections),
460 pcg 1.1 \&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection on the first packet sent, and
461     take it down after the keepalive interval) or \f(CW\*(C`disabled\*(C'\fR (node is bad,
462     don't talk to it).
463     .IP "inherit-tos = yes|true|on | no|false|off" 4
464     .IX Item "inherit-tos = yes|true|on | no|false|off"
465     Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when
466     sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then
467     outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent
468     to the tunnel device, which is usually what you want.
469     .IP "compress = yes|true|on | no|false|off" 4
470     .IX Item "compress = yes|true|on | no|false|off"
471     Wether to compress data packets sent to this host (default: \f(CW\*(C`yes\*(C'\fR).
472     Compression is really cheap even on slow computers and has no size
473     overhead at all, so enabling this is a good idea.
474     .IP "max-retry = positive-number" 4
475     .IX Item "max-retry = positive-number"
476     The maximum interval in seconds (default: \f(CW28800\fR, 8 hours) between
477     retries to establish a connection to this node. When a connection cannot
478     be established, gvpe uses exponential backoff capped at this value. It's
479     sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on
480     connections to routers that usually are stable but sometimes are down, to
481     assure quick reconnections.
482     .SH "CONFIG DIRECTORY LAYOUT"
483     .IX Header "CONFIG DIRECTORY LAYOUT"
484     The default (or recommended) directory layout for the config directory is:
485 pcg 1.4 .IP "\(bu" 4
486     .IX Xref "gvpe.conf"
487 pcg 1.1 The config file.
488 pcg 1.4 .IP "\(bu" 4
489     .IX Xref "if-up"
490 pcg 1.1 The if-up script
491 pcg 1.4 .IP "," 4
492     .IX Xref "node-up node-down"
493 pcg 1.1 If used the node up or node-down scripts.
494 pcg 1.4 .IP "\(bu" 4
495     .IX Xref "hostkey"
496 pcg 1.1 The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host.
497 pcg 1.4 .IP "\(bu" 4
498     .IX Xref "pubkey nodename"
499 pcg 1.1 The public keys of the other nodes, one file per node.
500     .SH "SEE ALSO"
501     .IX Header "SEE ALSO"
502     \&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8).
503     .SH "AUTHOR"
504     .IX Header "AUTHOR"
505     Marc Lehmann <gvpe@plan9.de>