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129.\" ======================================================================== 132.\" ========================================================================
130.\" 133.\"
131.IX Title "GVPE.CONF 5" 134.IX Title "GVPE.CONF 5"
132.TH GVPE.CONF 5 "2005-03-01" "1.7" "GNU Virtual Private Ethernet" 135.TH GVPE.CONF 5 "2008-08-07" "2.2" "GNU Virtual Private Ethernet"
136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
139.nh
133.SH "NAME" 140.SH "NAME"
134gvpe.conf \- configuration file for the GNU VPE daemon 141gvpe.conf \- configuration file for the GNU VPE daemon
135.SH "SYNOPSIS" 142.SH "SYNOPSIS"
136.IX Header "SYNOPSIS" 143.IX Header "SYNOPSIS"
137.Vb 3 144.Vb 3
138\& udp-port = 407 145\& udp\-port = 407
139\& mtu = 1492 146\& mtu = 1492
140\& ifname = vpn0 147\& ifname = vpn0
141.Ve 148\&
142.PP
143.Vb 2
144\& node = branch1 149\& node = branch1
145\& hostname = 1.2.3.4 150\& hostname = 1.2.3.4
146.Ve 151\&
147.PP
148.Vb 3
149\& node = branch2 152\& node = branch2
150\& hostname = www.example.net 153\& hostname = www.example.net
151\& udp-port = 500 # this host uses a different udp-port 154\& udp\-port = 500 # this host uses a different udp\-port
152.Ve 155\&
153.PP
154.Vb 2
155\& node = branch3 156\& node = branch3
156\& connect = ondemand 157\& connect = ondemand
157.Ve 158.Ve
158.SH "DESCRIPTION" 159.SH "DESCRIPTION"
159.IX Header "DESCRIPTION" 160.IX Header "DESCRIPTION"
160The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable 161The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable
161= value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR and 162= value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR and
162extend to the end of the line. They can be used on their own lines, or 163extend to the end of the line. They can be used on their own lines, or
163after any directives. Spaces are allowed before or after the \f(CW\*(C`=\*(C'\fR sign or 164after any directives. Whitespace is allowed around the \f(CW\*(C`=\*(C'\fR sign or after
164after values, but not within the variable names or values themselves. 165values, but not within the variable names or values themselves.
165.PP 166.PP
166The only exception to the above is the \*(L"on\*(R" directive that can prefix any 167The only exception to the above is the \*(L"on\*(R" directive that can prefix any
167\&\f(CW\*(C`name = value\*(C'\fR setting and will only \*(L"execute\*(R" it on the named node, or 168\&\f(CW\*(C`name = value\*(C'\fR setting and will only \*(L"execute\*(R" it on the named node, or
168(if the nodename starts with \*(L"!\*(R") on all nodes except the named one. 169(if the nodename starts with \*(L"!\*(R") on all nodes except the named one.
169.PP 170.PP
… …
194.IX Subsection "GLOBAL SETTINGS" 195.IX Subsection "GLOBAL SETTINGS"
195Global settings will affect the behaviour of the running gvpe daemon, that 196Global settings will affect the behaviour of the running gvpe daemon, that
196is, they are in some sense node-specific (config files can set different 197is, they are in some sense node-specific (config files can set different
197values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of 198values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of
198the gvpe daemon and all connections it creates. 199the gvpe daemon and all connections it creates.
199.IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4 200.IP "dns-forw-host = hostname/ip" 4
200.IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical" 201.IX Item "dns-forw-host = hostname/ip"
201Set the logging level. Connection established messages are logged at level 202The dns server to forward dns requests to for the \s-1DNS\s0 tunnel protocol
202\&\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. 203(default: \f(CW127.0.0.1\fR, changing it is highly recommended).
203.IP "node = nickname" 4 204.IP "dns-forw-port = port-number" 4
204.IX Item "node = nickname" 205.IX Item "dns-forw-port = port-number"
205Not really a config setting but introduces a node section. The nickname is 206The port where the \f(CW\*(C`dns\-forw\-host\*(C'\fR is to be contacted (default: \f(CW53\fR,
206used to select the right configuration section and must be passed as an 207which is fine in most cases).
207argument to the gvpe daemon. 208.IP "dns-max-outstanding = integer-number-of-requests" 4
208.IP "private-key = relative-path-to-key" 4 209.IX Item "dns-max-outstanding = integer-number-of-requests"
209.IX Item "private-key = relative-path-to-key" 210The maximum number of outstanding \s-1DNS\s0 transport requests
210Sets the path (relative to the config directory) to the private key 211(default: \f(CW100\fR). \s-1GVPE\s0 will never issue more requests then the given
211(default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must 212limit without receiving replies. In heavily overloaded situations it might
212be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could 213help to set this to a low number (e.g. \f(CW3\fR or even \f(CW1\fR) to limit the
213use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where 214number of parallel requests.
214\&\f(CW\*(C`gvpectrl\*(C'\fR puts them.
215.Sp 215.Sp
216Since only the private key file of the current node is used and the 216The default should be working ok for most links.
217private key file should be kept secret per-host to avoid spoofings, it is 217.IP "dns-overlap-factor = float" 4
218not recommended to use this feature. 218.IX Item "dns-overlap-factor = float"
219The \s-1DNS\s0 transport uses the minimum request latency (\fBmin_latency\fR) seen
220during a connection as it's timing base. This factor (default: \f(CW0.5\fR,
221must be > 0) is multiplied by \fBmin_latency\fR to get the maximum sending
222rate (= minimum send interval), i.e. a factor of \f(CW1\fR means that a new
223request might be generated every \fBmin_latency\fR seconds, which means on
224average there should only ever be one outstanding request. A factor of
225\&\f(CW0.5\fR means that \s-1GVPE\s0 will send requests twice as often as the minimum
226latency measured.
227.Sp
228For congested or picky dns forwarders you could use a value nearer to or
229exceeding \f(CW1\fR.
230.Sp
231The default should be working ok for most links.
232.IP "dns-send-interval = send-interval-in-seconds" 4
233.IX Item "dns-send-interval = send-interval-in-seconds"
234The minimum send interval (= maximum rate) that the \s-1DNS\s0 transport will
235use to send new \s-1DNS\s0 requests. \s-1GVPE\s0 will not exceed this rate even when
236the latency is very low. The default is \f(CW0.01\fR, which means \s-1GVPE\s0 will
237not send more than 100 \s-1DNS\s0 requests per connection per second. For
238high-bandwidth links you could go lower, e.g. to \f(CW0.001\fR or so. For
239congested or rate-limited links, you might want to go higher, say \f(CW0.1\fR,
240\&\f(CW0.2\fR or even higher.
241.Sp
242The default should be working ok for most links.
243.IP "dns-timeout-factor = float" 4
244.IX Item "dns-timeout-factor = float"
245Factor to multiply the \f(CW\*(C`min_latency\*(C'\fR (see \f(CW\*(C`dns\-overlap\-factor\*(C'\fR) by to
246get request timeouts. The default of \f(CW8\fR means that the \s-1DNS\s0 transport
247will resend the request when no reply has been received for longer than
248eight times the minimum (= expected) latency, assuming the request or
249reply has been lost.
250.Sp
251For congested links a higher value might be necessary (e.g. \f(CW30\fR). If
252the link is very stable lower values (e.g. \f(CW2\fR) might work
253nicely. Values near or below \f(CW1\fR makes no sense whatsoever.
254.Sp
255The default should be working ok for most links but will result in low
256throughput if packet loss is high.
257.IP "if-up = relative-or-absolute-path" 4
258.IX Item "if-up = relative-or-absolute-path"
259Sets the path of a script that should be called immediately after the
260network interface is initialized (but not neccessarily up). The following
261environment variables are passed to it (the values are just examples).
262.Sp
263Variables that have the same value on all nodes:
264.RS 4
265.IP "CONFBASE=/etc/gvpe" 4
266.IX Item "CONFBASE=/etc/gvpe"
267The configuration base directory.
268.IP "IFNAME=vpn0" 4
269.IX Item "IFNAME=vpn0"
270The network interface to initialize.
271.IP "IFTYPE=native # or tincd" 4
272.IX Item "IFTYPE=native # or tincd"
273.PD 0
274.IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4
275.IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.."
276.PD
277The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the
278\&\s-1OS\s0 name in lowercase) that this \s-1GVPE\s0 was configured for. Can be used to
279select the correct syntax to use for network-related commands.
280.IP "MTU=1436" 4
281.IX Item "MTU=1436"
282The \s-1MTU\s0 to set the interface to. You can use lower values (if done
283consistently on all hosts), but this is usually ineffective.
284.IP "NODES=5" 4
285.IX Item "NODES=5"
286The number of nodes in this \s-1GVPE\s0 network.
287.RE
288.RS 4
289.Sp
290Variables that are node-specific and with values pertaining to the node
291running this \s-1GVPE:\s0
292.IP "IFUPDATA=string" 4
293.IX Item "IFUPDATA=string"
294The value of the configuration directive \f(CW\*(C`if\-up\-data\*(C'\fR.
295.IP "MAC=fe:fd:80:00:00:01" 4
296.IX Item "MAC=fe:fd:80:00:00:01"
297The \s-1MAC\s0 address the network interface has to use.
298.Sp
299Might be used to initialize interfaces on platforms where \s-1GVPE\s0 does not
300do this automatically. Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR manpage for
301platform-specific information.
302.IP "NODENAME=branch1" 4
303.IX Item "NODENAME=branch1"
304The nickname of the node.
305.IP "NODEID=1" 4
306.IX Item "NODEID=1"
307The numerical node \s-1ID\s0 of the node running this instance of \s-1GVPE\s0. The first
308node mentioned in the config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on.
309.RE
310.RS 4
311.Sp
312In addition, all node-specific variables (except \f(CW\*(C`NODEID\*(C'\fR) will be
313available with a postfix of \f(CW\*(C`_nodeid\*(C'\fR, which contains the value for that
314node, e.g. the \f(CW\*(C`MAC_1\*(C'\fR variable contains the \s-1MAC\s0 address of node #1, while
315the \f(CW\*(C`NODENAME_22\*(C'\fR variable contains the name of node #22.
316.Sp
317Here is a simple if-up script:
318.Sp
319.Vb 5
320\& #!/bin/sh
321\& ip link set $IFNAME up
322\& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
323\& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
324\& ip route add 10.0.0.0/8 dev $IFNAME
325.Ve
326.Sp
327More complicated examples (using routing to reduce arp traffic) can be
328found in the etc/ subdirectory of the distribution.
329.RE
330.IP "ifname = devname" 4
331.IX Item "ifname = devname"
332Sets the tun interface name to the given name. The default is OS-specific
333and most probably something like \f(CW\*(C`tun0\*(C'\fR.
219.IP "ifpersist = yes|true|on | no|false|off" 4 334.IP "ifpersist = yes|true|on | no|false|off" 4
220.IX Item "ifpersist = yes|true|on | no|false|off" 335.IX Item "ifpersist = yes|true|on | no|false|off"
221Should the tun/tap device be made persistent, that is, should the device 336Should the tun/tap device be made persistent, that is, should the device
222stay up even when gvpe exits? Some versions of the tunnel device have 337stay up even when gvpe exits? Some versions of the tunnel device have
223problems sending packets when gvpe is restarted in persistent mode, so 338problems sending packets when gvpe is restarted in persistent mode, so
224if the connections can be established but you cannot send packets from 339if the connections can be established but you cannot send packets from
225the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the 340the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the
226device. 341device.
227.IP "ifname = devname" 4 342.IP "ip-proto = numerical-ip-protocol" 4
228.IX Item "ifname = devname" 343.IX Item "ip-proto = numerical-ip-protocol"
229Sets the tun interface name to the given name. The default is OS-specific 344Sets the protocol number to be used for the rawip protocol. This is a
230and most probably something like \f(CW\*(C`tun0\*(C'\fR. 345global option because all hosts must use the same protocol, and since
231.IP "rekey = seconds" 4 346there are no port numbers, you cannot easily run more than one gvpe
232.IX Item "rekey = seconds" 347instance using the same protocol, nor can you share the protocol with
233Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are 348other programs.
234reestablished every \f(CW\*(C`rekey\*(C'\fR seconds. 349.Sp
350The default is 47 (\s-1GRE\s0), which has a good chance of tunneling through
351firewalls (but note that the rawip protocol is not \s-1GRE\s0 compatible). Other
352common choices are 50 (\s-1IPSEC\s0, \s-1ESP\s0), 51 (\s-1IPSEC\s0, \s-1AH\s0), 4 (\s-1IPIP\s0 tunnels) or 98
353(\s-1ENCAP\s0, rfc1241)
354.IP "http-proxy-host = hostname/ip" 4
355.IX Item "http-proxy-host = hostname/ip"
356The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was
357compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of
358tcp connections through a http proxy server.
359.Sp
360\&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and
361port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy
362requires authentication.
363.Sp
364Please note that gvpe will still try to resolve all hostnames in the
365configuration file, so if you are behind a proxy without access to a dns
366server better use numerical \s-1IP\s0 addresses.
367.Sp
368To make best use of this option disable all protocols except tcp in your
369config file and make sure your routers (or all other hosts) are listening
370on a port that the proxy allows (443, https, is a common choice).
371.Sp
372If you have a router, connecting to it will suffice. Otherwise tcp must be
373enabled on all hosts.
374.Sp
375Example:
376.Sp
377.Vb 3
378\& http\-proxy\-host = proxy.example.com
379\& http\-proxy\-port = 3128 # 8080 is another common choice
380\& http\-proxy\-auth = schmorp:grumbeere
381.Ve
382.IP "http-proxy-port = proxy-tcp-port" 4
383.IX Item "http-proxy-port = proxy-tcp-port"
384The port where your proxy server listens.
385.IP "http-proxy-auth = login:password" 4
386.IX Item "http-proxy-auth = login:password"
387The optional login and password used to authenticate to the proxy server,
388seperated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is
389currently supported.
235.IP "keepalive = seconds" 4 390.IP "keepalive = seconds" 4
236.IX Item "keepalive = seconds" 391.IX Item "keepalive = seconds"
237Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this 392Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this
238many seconds of inactivity the daemon will start to send keepalive probe 393many seconds of inactivity the daemon will start to send keepalive probe
239every 5 seconds until it receives a reply from the other end. If no reply 394every 5 seconds until it receives a reply from the other end. If no reply
240is received within 30 seconds, the peer is considered unreachable and the 395is received within 30 seconds, the peer is considered unreachable and the
241connection is closed. 396connection is closed.
397.IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4
398.IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical"
399Set the logging level. Connection established messages are logged at level
400\&\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.
242.IP "mtu = bytes" 4 401.IP "mtu = bytes" 4
243.IX Item "mtu = bytes" 402.IX Item "mtu = bytes"
244Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically 403Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically
245the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate 404the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate
246maximum overhead (e.g. udp header size, encryption blocksize...) and pass 405maximum overhead (e.g. udp header size, encryption blocksize...) and pass
247this information to the \f(CW\*(C`if\-up\*(C'\fR script. 406this information to the \f(CW\*(C`if\-up\*(C'\fR script.
248.Sp 407.Sp
249Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). 408Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).
250.Sp 409.Sp
251This value must be the minimum of the mtu values of all hosts. 410This value must be the minimum of the mtu values of all hosts.
252.IP "ip-proto = numerical-ip-protocol" 4 411.IP "node = nickname" 4
253.IX Item "ip-proto = numerical-ip-protocol" 412.IX Item "node = nickname"
254Sets the protocol number to be used for the rawip protocol. This is a 413Not really a config setting but introduces a node section. The nickname is
255global option because all hosts must use the same protocol, and since 414used to select the right configuration section and must be passed as an
256there are no port numbers, you cannot easily run more than one gvpe 415argument to the gvpe daemon.
257instance using the same protocol, nor can you share the protocol with
258other programs.
259.Sp
260The default is 47 (\s-1GRE\s0), which has a good chance of tunneling through
261firewalls (but note that the rawip protocol is not \s-1GRE\s0 compatible). Other
262common choices are 50 (\s-1IPSEC\s0, \s-1ESP\s0), 51 (\s-1IPSEC\s0, \s-1AH\s0), 4 (\s-1IPIP\s0 tunnels) or 98
263(\s-1ENCAP\s0, rfc1241)
264.IP "if-up = relative-or-absolute-path" 4
265.IX Item "if-up = relative-or-absolute-path"
266Sets the path of a script that should be called immediately after the
267network interface is initialized (but not neccessarily up). The following
268environment variables are passed to it (the values are just examples):
269.RS 4
270.IP "CONFBASE=/etc/gvpe" 4
271.IX Item "CONFBASE=/etc/gvpe"
272The configuration base directory.
273.IP "IFNAME=vpn0" 4
274.IX Item "IFNAME=vpn0"
275The interface to initialize.
276.IP "MTU=1436" 4
277.IX Item "MTU=1436"
278The \s-1MTU\s0 to set the interface to. You can use lower values (if done
279consistently on all hosts), but this is usually ineffective.
280.IP "MAC=fe:fd:80:00:00:01" 4
281.IX Item "MAC=fe:fd:80:00:00:01"
282The \s-1MAC\s0 address to set the interface to. The script *must* set the
283interface \s-1MAC\s0 to this value. You will most likely use one of these:
284.Sp
285.Vb 2
286\& ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux
287\& ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD
288.Ve
289.Sp
290Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR manpage for platform-specific information.
291.IP "IFTYPE=native # or tincd" 4
292.IX Item "IFTYPE=native # or tincd"
293.PD 0
294.IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4
295.IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.."
296.PD
297The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the os
298name in lowercase) that this gvpe was configured for. Can be used to select
299the correct syntax to use for network-related commands.
300.IP "NODENAME=branch1" 4
301.IX Item "NODENAME=branch1"
302The nickname of the current node, as passed to the gvpe daemon.
303.IP "NODEID=1" 4
304.IX Item "NODEID=1"
305The numerical node id of the current node. The first node mentioned in the
306config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on.
307.RE
308.RS 4
309.Sp
310Here is a simple if-up script:
311.Sp
312.Vb 5
313\& #!/bin/sh
314\& ip link set $IFNAME address $MAC mtu $MTU up
315\& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
316\& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
317\& ip route add 10.0.0.0/8 dev $IFNAME
318.Ve
319.Sp
320More complicated examples (using routing to reduce arp traffic) can be
321found in the etc/ subdirectory of the distribution.
322.RE
323.IP "node-up = relative-or-absolute-path" 4 416.IP "node-up = relative-or-absolute-path" 4
324.IX Item "node-up = relative-or-absolute-path" 417.IX Item "node-up = relative-or-absolute-path"
325Sets a command (default: no script) that should be called whenever a 418Sets a command (default: none) that should be called whenever a connection
326connection is established (even on rekeying operations). In addition 419is established (even on rekeying operations). Note that node\-up/down
420scripts will be run asynchronously, but execution is serialised, so there
421will only ever be one such script running.
422.Sp
327to the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following environment 423In addition to all the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following
328variables will be set: 424environment variables will be set:
329.RS 4 425.RS 4
330.IP "DESTNODE=branch2" 4 426.IP "DESTNODE=branch2" 4
331.IX Item "DESTNODE=branch2" 427.IX Item "DESTNODE=branch2"
332The name of the remote node. 428The name of the remote node.
333.IP "DESTID=2" 4 429.IP "DESTID=2" 4
… …
354\& #!/bin/sh 450\& #!/bin/sh
355\& { 451\& {
356\& echo update delete $DESTNODE.lowttl.example.net. a 452\& echo update delete $DESTNODE.lowttl.example.net. a
357\& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP 453\& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP
358\& echo 454\& echo
359\& } | nsupdate -d -k $CONFBASE:key.example.net. 455\& } | nsupdate \-d \-k $CONFBASE:key.example.net.
360.Ve 456.Ve
361.RE 457.RE
362.IP "node-down = relative-or-absolute-path" 4 458.IP "node-down = relative-or-absolute-path" 4
363.IX Item "node-down = relative-or-absolute-path" 459.IX Item "node-down = relative-or-absolute-path"
364Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost. 460Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost.
365.IP "http-proxy-host = hostname/ip" 4
366.IX Item "http-proxy-host = hostname/ip"
367The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was
368compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of
369tcp connections through a http proxy server.
370.Sp
371\&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and
372port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy
373requires authentication.
374.Sp
375Please note that gvpe will still try to resolve all hostnames in the
376configuration file, so if you are behind a proxy without access to a dns
377server better use numerical \s-1IP\s0 addresses.
378.Sp
379To make best use of this option disable all protocols except tcp in your
380config file and make sure your routers (or all other hosts) are listening
381on a port that the proxy allows (443, https, is a common choice).
382.Sp
383If you have a router, connecting to it will suffice. Otherwise tcp must be
384enabled on all hosts.
385.Sp
386Example:
387.Sp
388.Vb 3
389\& http-proxy-host = proxy.example.com
390\& http-proxy-port = 3128 # 8080 is another common choice
391\& http-proxy-auth = schmorp:grumbeere
392.Ve
393.IP "http-proxy-port = proxy-tcp-port" 4
394.IX Item "http-proxy-port = proxy-tcp-port"
395The port where your proxy server listens.
396.IP "http-proxy-auth = login:password" 4
397.IX Item "http-proxy-auth = login:password"
398The optional login and password used to authenticate to the proxy server,
399seperated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is
400currently supported.
401.IP "pid-file = path" 4 461.IP "pid-file = path" 4
402.IX Item "pid-file = path" 462.IX Item "pid-file = path"
403The path to the pid file to check and create (Default: 463The path to the pid file to check and create
464(default: \f(CW\*(C`LOCALSTATEDIR/run/gvpe.pid\*(C'\fR).
465.IP "private-key = relative-path-to-key" 4
466.IX Item "private-key = relative-path-to-key"
467Sets the path (relative to the config directory) to the private key
468(default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must
469be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could
470use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where
471\&\f(CW\*(C`gvpectrl\*(C'\fR puts them.
472.Sp
473Since only the private key file of the current node is used and the
474private key file should be kept secret per-host to avoid spoofings, it is
475not recommended to use this feature.
476.IP "rekey = seconds" 4
477.IX Item "rekey = seconds"
478Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are
479reestablished every \f(CW\*(C`rekey\*(C'\fR seconds.
404.Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0" 480.Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0"
405.IX Subsection "NODE SPECIFIC SETTINGS" 481.IX Subsection "NODE SPECIFIC SETTINGS"
406The following settings are node\-specific, that is, every node can have 482The following settings are node-specific, that is, every node can have
407different settings, even within the same gvpe instance. Settings that are 483different settings, even within the same gvpe instance. Settings that are
408executed before the first node section set the defaults, settings that are 484set before the first node section set the defaults, settings that are
409executed within a node section only apply to the given node. 485set within a node section only apply to the given node.
486.IP "allow-direct = nodename" 4
487.IX Item "allow-direct = nodename"
488Allow direct connections to this node. See \f(CW\*(C`deny\-direct\*(C'\fR for more info.
489.IP "compress = yes|true|on | no|false|off" 4
490.IX Item "compress = yes|true|on | no|false|off"
491Wether to compress data packets sent to this host (default: \f(CW\*(C`yes\*(C'\fR).
492Compression is really cheap even on slow computers and has no size
493overhead at all, so enabling this is a good idea.
494.IP "connect = ondemand | never | always | disabled" 4
495.IX Item "connect = ondemand | never | always | disabled"
496Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always
497try to establish and keep a connection to the given host), \f(CW\*(C`never\*(C'\fR
498(never initiate a connection to the given host, but accept connections),
499\&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection when there are outstanding
500packets in the queue and take it down after the keepalive interval) or
501\&\f(CW\*(C`disabled\*(C'\fR (node is bad, don't talk to it).
502.IP "deny-direct = nodename | *" 4
503.IX Item "deny-direct = nodename | *"
504Deny direct connections to the specified node (or all nodes when \f(CW\*(C`*\*(C'\fR
505is given). Only one node can be specified, but you can use multiple
506\&\f(CW\*(C`allow\-direct\*(C'\fR and \f(CW\*(C`deny\-direct\*(C'\fR statements. This only makes sense in
507networks with routers, as routers are required for indirect connections.
508.Sp
509Sometimes, a node cannot reach some other nodes for reasons of network
510connectivity. For example, a node behind a firewall that only allows
511conenctions to/from a single other node in the network. In this case one
512should specify \f(CW\*(C`deny\-direct = *\*(C'\fR and \f(CW\*(C`allow\-direct = othernodename\*(C'\fR (the other
513node \fImust\fR be a router for this to work).
514.Sp
515The algorithm to check wether a connection may be direct is as follows:
516.Sp
5171. Other node mentioned in a \f(CW\*(C`allow\-direct\*(C'\fR? If yes, allow the connection.
518.Sp
5192. Other node mentioned in a \f(CW\*(C`deny\-direct\*(C'\fR? If yes, deny direct connections.
520.Sp
5213. Allow the connection.
522.Sp
523That is, \f(CW\*(C`allow\-direct\*(C'\fR takes precedence over \f(CW\*(C`deny\-direct\*(C'\fR.
524.Sp
525The check is done in both directions, i.e. both nodes must allow a direct
526connection before one is attempted, so you only need to specify connect
527limitations on one node.
528.IP "dns-domain = domain-suffix" 4
529.IX Item "dns-domain = domain-suffix"
530The \s-1DNS\s0 domain suffix that points to the \s-1DNS\s0 tunnel server for this node.
531.Sp
532The domain must point to a \s-1NS\s0 record that points to the \fIdns-hostname\fR,
533i.e.
534.Sp
535.Vb 2
536\& dns\-domainname = tunnel.example.net
537\& dns\-hostname = tunnel\-server.example.net
538.Ve
539.Sp
540Corresponds to the following \s-1DNS\s0 entries in the \f(CW\*(C`example.net\*(C'\fR domain:
541.Sp
542.Vb 2
543\& tunnel.example.net. NS tunnel\-server.example.net.
544\& tunnel\-server.example.net. A 13.13.13.13
545.Ve
546.IP "dns-hostname = hostname/ip" 4
547.IX Item "dns-hostname = hostname/ip"
548The address to bind the \s-1DNS\s0 tunnel socket to, similar to the \f(CW\*(C`hostname\*(C'\fR,
549but for the \s-1DNS\s0 tunnel protocol only. Default: \f(CW0.0.0.0\fR, but that might
550change.
410.IP "udp-port = port-number" 4 551.IP "dns-port = port-number" 4
411.IX Item "udp-port = port-number" 552.IX Item "dns-port = port-number"
412Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not 553The port to bind the \s-1DNS\s0 tunnel socket to. Must be \f(CW53\fR on \s-1DNS\s0 tunnel servers.
413officially assigned by \s-1IANA\s0!). 554.IP "enable-dns = yes|true|on | no|false|off" 4
414.IP "tcp-port = port-number" 4 555.IX Item "enable-dns = yes|true|on | no|false|off"
415.IX Item "tcp-port = port-number" 556See \fIgvpe.protocol\fR\|(7) for a description of the \s-1DNS\s0 transport
416Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number. 557protocol. Avoid this protocol if you can.
558.Sp
559Enable the \s-1DNS\s0 tunneling protocol on this node, either as server or as
560client. Support for this transport protocol is only available when gvpe
561was compiled using the \f(CW\*(C`\-\-enable\-dns\*(C'\fR option.
562.IP "enable-icmp = yes|true|on | no|false|off" 4
563.IX Item "enable-icmp = yes|true|on | no|false|off"
564See \fIgvpe.protocol\fR\|(7) for a description of the \s-1ICMP\s0 transport protocol.
565.Sp
566Enable the \s-1ICMP\s0 transport using icmp packets of type \f(CW\*(C`icmp\-type\*(C'\fR on this
567node.
417.IP "enable-rawip = yes|true|on | no|false|off" 4 568.IP "enable-rawip = yes|true|on | no|false|off" 4
418.IX Item "enable-rawip = yes|true|on | no|false|off" 569.IX Item "enable-rawip = yes|true|on | no|false|off"
570See \fIgvpe.protocol\fR\|(7) for a description of the \s-1RAW\s0 \s-1IP\s0 transport protocol.
571.Sp
419Enable the \s-1RAW\s0 IPv4 transport using the \f(CW\*(C`ip\-proto\*(C'\fR protocol 572Enable the \s-1RAW\s0 IPv4 transport using the \f(CW\*(C`ip\-proto\*(C'\fR protocol
420(default: \f(CW\*(C`no\*(C'\fR). This is the best choice, since the overhead per packet 573(default: \f(CW\*(C`no\*(C'\fR).
421is only 38 bytes, as opposed to \s-1UDP\s0's 58 (or \s-1TCP\s0's 60+). 574.IP "enable-tcp = yes|true|on | no|false|off" 4
575.IX Item "enable-tcp = yes|true|on | no|false|off"
576See \fIgvpe.protocol\fR\|(7) for a description of the \s-1TCP\s0 transport protocol.
577.Sp
578Enable the TCPv4 transport using the \f(CW\*(C`tcp\-port\*(C'\fR port
579(default: \f(CW\*(C`no\*(C'\fR). Support for this transport protocol is only available
580when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option.
422.IP "enable-udp = yes|true|on | no|false|off" 4 581.IP "enable-udp = yes|true|on | no|false|off" 4
423.IX Item "enable-udp = yes|true|on | no|false|off" 582.IX Item "enable-udp = yes|true|on | no|false|off"
583See \fIgvpe.protocol\fR\|(7) for a description of the \s-1UDP\s0 transport protocol.
584.Sp
424Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`no\*(C'\fR, 585Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`no\*(C'\fR,
425unless no other protocol is enabled for a node, in which case this 586unless no other protocol is enabled for a node, in which case this
426protocol is enabled automatically). This is a good general choice since 587protocol is enabled automatically).
427\&\s-1UDP\s0 tunnels well through many firewalls.
428.Sp 588.Sp
429\&\s-1NOTE:\s0 Please specify \f(CW\*(C`enable\-udp = yes\*(C'\fR if you want t use it even though 589\&\s-1NOTE:\s0 Please specify \f(CW\*(C`enable\-udp = yes\*(C'\fR if you want t use it even though
430it might get switched on automatically, as some future version might 590it might get switched on automatically, as some future version might
431default to another default protocol. 591default to another default protocol.
592.IP "hostname = hostname | ip [can not be defaulted]" 4
593.IX Item "hostname = hostname | ip [can not be defaulted]"
594Forces the address of this node to be set to the given dns hostname or ip
595address. It will be resolved before each connect request, so dyndns should
596work fine. If this setting is not specified and a router is available,
597then the router will be queried for the address of this node. Otherwise,
598the connection attempt will fail.
599.IP "icmp-type = integer" 4
600.IX Item "icmp-type = integer"
601Sets the type value to be used for outgoing (and incoming) packets sent
602via the \s-1ICMP\s0 transport.
603.Sp
604The default is \f(CW0\fR (which is \f(CW\*(C`echo\-reply\*(C'\fR, also known as
605\&\*(L"ping-replies\*(R"). Other useful values include \f(CW8\fR (\f(CW\*(C`echo\-request\*(C'\fR, a.k.a.
606\&\*(L"ping\*(R") and \f(CW11\fR (\f(CW\*(C`time\-exceeded\*(C'\fR), but any 8\-bit value can be used.
607.IP "if-up-data = value" 4
608.IX Item "if-up-data = value"
609The value specified using this directive will be passed to the \f(CW\*(C`if\-up\*(C'\fR
610script in the environment variable \f(CW\*(C`IFUPDATA\*(C'\fR.
432.IP "enable-tcp = yes|true|on | no|false|off" 4 611.IP "inherit-tos = yes|true|on | no|false|off" 4
433.IX Item "enable-tcp = yes|true|on | no|false|off" 612.IX Item "inherit-tos = yes|true|on | no|false|off"
434Enable the TCPv4 transport using the \f(CW\*(C`tcp\-port\*(C'\fR port 613Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when
435(default: \f(CW\*(C`no\*(C'\fR). Support for this horribly unsuitable protocol is only 614sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then
436available when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option. Never 615outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent
437use this transport unless you really must, it is horribly ineffiecent and 616to the tunnel device, which is usually what you want.
438resource-intensive compared to the other transports. 617.IP "max-retry = positive-number" 4
618.IX Item "max-retry = positive-number"
619The maximum interval in seconds (default: \f(CW3600\fR, one hour) between
620retries to establish a connection to this node. When a connection cannot
621be established, gvpe uses exponential backoff capped at this value. It's
622sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on
623connections to routers that usually are stable but sometimes are down, to
624assure quick reconnections even after longer downtimes.
625.IP "max-ttl = seconds" 4
626.IX Item "max-ttl = seconds"
627Expire packets that couldn't be sent after this many seconds
628(default: \f(CW60\fR). Gvpe will normally queue packets for a node without an
629active connection, in the hope of establishing a connection soon. This
630value specifies the maximum lifetime a packet will stay in the queue, if a
631packet gets older, it will be thrown away.
632.IP "max-queue = positive-number" 4
633.IX Item "max-queue = positive-number"
634The maximum number of packets that will be queued (default: \f(CW512\fR)
635for this node. If more packets are sent then earlier packets will be
636expired. See \f(CW\*(C`max\-ttl\*(C'\fR, above.
439.IP "router-priority = 0 | 1 | positive\-number>2" 4 637.IP "router-priority = 0 | 1 | positive\-number>=2" 4
440.IX Item "router-priority = 0 | 1 | positive-number>2" 638.IX Item "router-priority = 0 | 1 | positive-number>=2"
441Sets the router priority of the given host (default: \f(CW0\fR, disabled). If 639Sets the router priority of the given host (default: \f(CW0\fR, disabled). If
442some host tries to connect to another host without a hostname, it asks 640some host tries to connect to another host without a hostname, it asks
443the router host for it's \s-1IP\s0 address. The router host is the one with the 641the router host for it's \s-1IP\s0 address. The router host is the one with the
444highest priority larger than \f(CW1\fR that is currently reachable. 642highest priority larger than \f(CW1\fR that is currently reachable.
445.Sp 643.Sp
… …
451disables routing. The idea behind this is that some hosts can, if 649disables routing. The idea behind this is that some hosts can, if
452required, bump the \f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their 650required, bump the \f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their
453local config to route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is 651local config to route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is
454\&\f(CW0\fR, then routing will be refused, so \f(CW1\fR serves as a \*(L"enable, but do 652\&\f(CW0\fR, then routing will be refused, so \f(CW1\fR serves as a \*(L"enable, but do
455not use by default\*(R" switch. 653not use by default\*(R" switch.
456.IP "connect = ondemand | never | always | disabled" 4 654.IP "tcp-port = port-number" 4
457.IX Item "connect = ondemand | never | always | disabled" 655.IX Item "tcp-port = port-number"
458Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always 656Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number.
459try to establish and keep a connection to the given host), \f(CW\*(C`never\*(C'\fR 657.IP "udp-port = port-number" 4
460(never initiate a connection to the given host, but accept connections), 658.IX Item "udp-port = port-number"
461\&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection on the first packet sent, and 659Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not
462take it down after the keepalive interval) or \f(CW\*(C`disabled\*(C'\fR (node is bad, 660officially assigned by \s-1IANA\s0!).
463don't talk to it).
464.IP "inherit-tos = yes|true|on | no|false|off" 4
465.IX Item "inherit-tos = yes|true|on | no|false|off"
466Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when
467sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then
468outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent
469to the tunnel device, which is usually what you want.
470.IP "compress = yes|true|on | no|false|off" 4
471.IX Item "compress = yes|true|on | no|false|off"
472Wether to compress data packets sent to this host (default: \f(CW\*(C`yes\*(C'\fR).
473Compression is really cheap even on slow computers and has no size
474overhead at all, so enabling this is a good idea.
475.IP "max-retry = positive-number" 4
476.IX Item "max-retry = positive-number"
477The maximum interval in seconds (default: \f(CW28800\fR, 8 hours) between
478retries to establish a connection to this node. When a connection cannot
479be established, gvpe uses exponential backoff capped at this value. It's
480sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on
481connections to routers that usually are stable but sometimes are down, to
482assure quick reconnections.
483.SH "CONFIG DIRECTORY LAYOUT" 661.SH "CONFIG DIRECTORY LAYOUT"
484.IX Header "CONFIG DIRECTORY LAYOUT" 662.IX Header "CONFIG DIRECTORY LAYOUT"
485The default (or recommended) directory layout for the config directory is: 663The default (or recommended) directory layout for the config directory is:
486.IP "\(bu" 4 664.IP "" 4
487.IX Xref "gvpe.conf" 665.IX Xref "gvpe.conf"
488The config file. 666The config file.
489.IP "\(bu" 4 667.IP "" 4
490.IX Xref "if-up" 668.IX Xref "if-up"
491The if-up script 669The if-up script
492.IP "," 4 670.IP "," 4
493.IX Xref "node-up node-down" 671.IX Xref "node-up node-down"
494If used the node up or node-down scripts. 672If used the node up or node-down scripts.
495.IP "\(bu" 4 673.IP "" 4
496.IX Xref "hostkey" 674.IX Xref "hostkey"
497The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host. 675The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host.
498.IP "\(bu" 4 676.IP "" 4
499.IX Xref "pubkey nodename" 677.IX Xref "pubkey nodename"
500The public keys of the other nodes, one file per node. 678The public keys of the other nodes, one file per node.
501.SH "SEE ALSO" 679.SH "SEE ALSO"
502.IX Header "SEE ALSO" 680.IX Header "SEE ALSO"
503\&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8). 681\&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8).
504.SH "AUTHOR" 682.SH "AUTHOR"
505.IX Header "AUTHOR" 683.IX Header "AUTHOR"
506Marc Lehmann <gvpe@plan9.de> 684Marc Lehmann <gvpe@schmorp.de>

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