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1.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14 1.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
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129.\" ======================================================================== 129.\" ========================================================================
130.\" 130.\"
131.IX Title "GVPE.CONF 5" 131.IX Title "GVPE.CONF 5"
132.TH GVPE.CONF 5 "2005-03-23" "1.9" "GNU Virtual Private Ethernet" 132.TH GVPE.CONF 5 "2011-02-15" "2.24" "GNU Virtual Private Ethernet"
133.SH "NAME" 133.SH "NAME"
134gvpe.conf \- configuration file for the GNU VPE daemon 134gvpe.conf \- configuration file for the GNU VPE daemon
135.SH "SYNOPSIS" 135.SH "SYNOPSIS"
136.IX Header "SYNOPSIS" 136.IX Header "SYNOPSIS"
137.Vb 3 137.Vb 4
138\& # global options for all nodes
138\& udp-port = 407 139\& udp\-port = 407
139\& mtu = 1492 140\& mtu = 1492
140\& ifname = vpn0 141\& ifname = vpn0
141.Ve 142.Ve
142.PP 143.PP
143.Vb 2 144.Vb 3
145\& # first node is named branch1 and is at 1.2.3.4
144\& node = branch1 146\& node = branch1
145\& hostname = 1.2.3.4 147\& hostname = 1.2.3.4
146.Ve 148.Ve
147.PP 149.PP
148.Vb 3 150.Vb 4
151\& # second node uses dns to resolve the address
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.Ve
153.PP 156.PP
154.Vb 2 157.Vb 3
158\& # third node has no fixed ip address
155\& node = branch3 159\& node = branch3
156\& connect = ondemand 160\& connect = ondemand
157.Ve 161.Ve
158.SH "DESCRIPTION" 162.SH "DESCRIPTION"
159.IX Header "DESCRIPTION" 163.IX Header "DESCRIPTION"
160The gvpe config file consists of a series of lines that contain \f(CW\*(C`variable 164The 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 165= 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 166extend 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 167after 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. 168values, but not within the variable names or values themselves.
165.PP 169.PP
166The only exception to the above is the \*(L"on\*(R" directive that can prefix any 170The 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 171\&\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. 172(if the nodename starts with \*(L"!\*(R") on all nodes except the named one.
169.PP 173.PP
174For example, set the \s-1MTU\s0 to \f(CW1450\fR everywhere, loglevel to \f(CW\*(C`noise\*(C'\fR on
175branch1, and connect to \f(CW\*(C`ondemand\*(C'\fR everywhere but on branch2:
176.PP
170.Vb 3 177.Vb 3
171\& name = value 178\& mtu = 1450
172\& on branch1 loglevel = noise 179\& on branch1 loglevel = noise
173\& on !branch2 connect = ondemand 180\& on !branch2 connect = ondemand
174.Ve 181.Ve
175.PP 182.PP
176All settings are executed \*(L"in order\*(R", that is, later settings of the same 183All settings are applied \*(L"in order\*(R", that is, later settings of the same
177variable overwrite earlier ones. 184variable overwrite earlier ones.
178.SH "ANATOMY OF A CONFIG FILE" 185.SH "ANATOMY OF A CONFIG FILE"
179.IX Header "ANATOMY OF A CONFIG FILE" 186.IX Header "ANATOMY OF A CONFIG FILE"
180Usually, a config file starts with global settings (like the udp port to 187Usually, a config file starts with a few global settings (like the \s-1UDP\s0
181listen on), followed by node-specific sections that begin with a \f(CW\*(C`node = 188port to listen on), followed by node-specific sections that begin with a
182nickname\*(C'\fR line. 189\&\f(CW\*(C`node = nickname\*(C'\fR line.
183.PP 190.PP
184Every node that is part of the network must have a section that starts 191Every node that is part of the network must have a section that starts
185with \f(CW\*(C`node = nickname\*(C'\fR. The number and order of the nodes is important 192with \f(CW\*(C`node = nickname\*(C'\fR. The number and order of the nodes is important
186and must be the same on all hosts. It is not uncommon for node sections to 193and must be the same on all nodes. It is not uncommon for node sections to
187be completely empty \- if the default values are right. 194be completely empty \- if the default values are right.
188.PP 195.PP
189Node-specific settings can be used at any time. If used before the first 196Node-specific settings can be used at any time. If used before the first
190node section they will set the default values for all following nodes. 197node section they will set the default values for all following nodes.
191.SH "CONFIG VARIABLES" 198.SH "CONFIG VARIABLES"
… …
196is, they are in some sense node-specific (config files can set different 203is, 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 204values on different nodes using \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of
198the gvpe daemon and all connections it creates. 205the gvpe daemon and all connections it creates.
199.IP "dns-forw-host = hostname/ip" 4 206.IP "dns-forw-host = hostname/ip" 4
200.IX Item "dns-forw-host = hostname/ip" 207.IX Item "dns-forw-host = hostname/ip"
201The dns server to forward dns requests to for the \s-1DNS\s0 tunnel protocol 208The \s-1DNS\s0 server to forward \s-1DNS\s0 requests to for the \s-1DNS\s0 tunnel protocol
202(default: \f(CW127.0.0.1\fR, changing it is highly recommended). 209(default: \f(CW127.0.0.1\fR, changing it is highly recommended).
203.IP "dns-forw-port = port-number" 4 210.IP "dns-forw-port = port-number" 4
204.IX Item "dns-forw-port = port-number" 211.IX Item "dns-forw-port = port-number"
205The port where the \f(CW\*(C`dns\-forw\-host\*(C'\fR is to be contacted (default: \f(CW53\fR, 212The port where the \f(CW\*(C`dns\-forw\-host\*(C'\fR is to be contacted (default: \f(CW53\fR,
206which is fine in most cases). 213which is fine in most cases).
… …
210(default: \f(CW100\fR). \s-1GVPE\s0 will never issue more requests then the given 217(default: \f(CW100\fR). \s-1GVPE\s0 will never issue more requests then the given
211limit without receiving replies. In heavily overloaded situations it might 218limit without receiving replies. In heavily overloaded situations it might
212help to set this to a low number (e.g. \f(CW3\fR or even \f(CW1\fR) to limit the 219help to set this to a low number (e.g. \f(CW3\fR or even \f(CW1\fR) to limit the
213number of parallel requests. 220number of parallel requests.
214.Sp 221.Sp
215The default should be working ok for most links. 222The default should be working \s-1OK\s0 for most links.
216.IP "dns-overlap-factor = float" 4 223.IP "dns-overlap-factor = float" 4
217.IX Item "dns-overlap-factor = float" 224.IX Item "dns-overlap-factor = float"
218The \s-1DNS\s0 transport uses the minimum request latency (\fBmin_latency\fR) seen 225The \s-1DNS\s0 transport uses the minimum request latency (\fBmin_latency\fR) seen
219during a connection as it's timing base. This factor (default: \f(CW0.5\fR, 226during a connection as it's timing base. This factor (default: \f(CW0.5\fR,
220must be > 0) is multiplied by \fBmin_latency\fR to get the maximum sending 227must be > 0) is multiplied by \fBmin_latency\fR to get the maximum sending
… …
222request might be generated every \fBmin_latency\fR seconds, which means on 229request might be generated every \fBmin_latency\fR seconds, which means on
223average there should only ever be one outstanding request. A factor of 230average there should only ever be one outstanding request. A factor of
224\&\f(CW0.5\fR means that \s-1GVPE\s0 will send requests twice as often as the minimum 231\&\f(CW0.5\fR means that \s-1GVPE\s0 will send requests twice as often as the minimum
225latency measured. 232latency measured.
226.Sp 233.Sp
227For congested or picky dns forwarders you could use a value nearer to or 234For congested or picky \s-1DNS\s0 forwarders you could use a value nearer to or
228exceeding \f(CW1\fR. 235exceeding \f(CW1\fR.
229.Sp 236.Sp
230The default should be working ok for most links. 237The default should be working \s-1OK\s0 for most links.
231.IP "dns-send-interval = send-interval-in-seconds" 4 238.IP "dns-send-interval = send-interval-in-seconds" 4
232.IX Item "dns-send-interval = send-interval-in-seconds" 239.IX Item "dns-send-interval = send-interval-in-seconds"
233The minimum send interval (= maximum rate) that the \s-1DNS\s0 transport will 240The minimum send interval (= maximum rate) that the \s-1DNS\s0 transport will
234use to send new \s-1DNS\s0 requests. \s-1GVPE\s0 will not exceed this rate even when 241use to send new \s-1DNS\s0 requests. \s-1GVPE\s0 will not exceed this rate even when
235the latency is very low. The default is \f(CW0.01\fR, which means \s-1GVPE\s0 will 242the latency is very low. The default is \f(CW0.01\fR, which means \s-1GVPE\s0 will
236not send more than 100 \s-1DNS\s0 requests per connection per second. For 243not send more than 100 \s-1DNS\s0 requests per connection per second. For
237high-bandwidth links you could go lower, e.g. to \f(CW0.001\fR or so. For 244high-bandwidth links you could go lower, e.g. to \f(CW0.001\fR or so. For
238congested or rate-limited links, you might want to go higher, say \f(CW0.1\fR, 245congested or rate-limited links, you might want to go higher, say \f(CW0.1\fR,
239\&\f(CW0.2\fR or even higher. 246\&\f(CW0.2\fR or even higher.
240.Sp 247.Sp
241The default should be working ok for most links. 248The default should be working \s-1OK\s0 for most links.
242.IP "dns-timeout-factor = float" 4 249.IP "dns-timeout-factor = float" 4
243.IX Item "dns-timeout-factor = float" 250.IX Item "dns-timeout-factor = float"
244Factor to multiply the \f(CW\*(C`min_latency\*(C'\fR (see \f(CW\*(C`dns\-overlap\-factor\*(C'\fR) by to 251Factor to multiply the \f(CW\*(C`min_latency\*(C'\fR (see \f(CW\*(C`dns\-overlap\-factor\*(C'\fR) by to
245get request timeouts. The default of \f(CW8\fR means that the \s-1DNS\s0 transport 252get request timeouts. The default of \f(CW8\fR means that the \s-1DNS\s0 transport
246will resend the request when no reply has been received for longer than 253will resend the request when no reply has been received for longer than
247eight times the minimum (= expected) latency, assuming the request or 254eight times the minimum (= expected) latency, assuming the request or
248reply has been lost. 255reply has been lost.
249.Sp 256.Sp
250For congested links a higher value might be necessary (e.g. \f(CW30\fR). If the 257For congested links a higher value might be necessary (e.g. \f(CW30\fR). If
251link is very stable lower values (e.g. \f(CW2\fR) might work nicely. Values 258the link is very stable lower values (e.g. \f(CW2\fR) might work
252near or below \f(CW1\fR makes no sense whatsoever. 259nicely. Values near or below \f(CW1\fR makes no sense whatsoever.
253.Sp 260.Sp
254The default should be working ok for most links. 261The default should be working \s-1OK\s0 for most links but will result in low
262throughput if packet loss is high.
255.IP "if-up = relative-or-absolute-path" 4 263.IP "if-up = relative-or-absolute-path" 4
256.IX Item "if-up = relative-or-absolute-path" 264.IX Item "if-up = relative-or-absolute-path"
257Sets the path of a script that should be called immediately after the 265Sets the path of a script that should be called immediately after the
258network interface is initialized (but not neccessarily up). The following 266network interface is initialized (but not necessarily up). The following
259environment variables are passed to it (the values are just examples): 267environment variables are passed to it (the values are just examples).
268.Sp
269Variables that have the same value on all nodes:
260.RS 4 270.RS 4
261.IP "CONFBASE=/etc/gvpe" 4 271.IP "CONFBASE=/etc/gvpe" 4
262.IX Item "CONFBASE=/etc/gvpe" 272.IX Item "CONFBASE=/etc/gvpe"
263The configuration base directory. 273The configuration base directory.
264.IP "IFNAME=vpn0" 4 274.IP "IFNAME=vpn0" 4
265.IX Item "IFNAME=vpn0" 275.IX Item "IFNAME=vpn0"
266The interface to initialize. 276The network interface to initialize.
267.IP "MTU=1436" 4
268.IX Item "MTU=1436"
269The \s-1MTU\s0 to set the interface to. You can use lower values (if done
270consistently on all hosts), but this is usually ineffective.
271.IP "MAC=fe:fd:80:00:00:01" 4
272.IX Item "MAC=fe:fd:80:00:00:01"
273The \s-1MAC\s0 address to set the interface to. The script *must* set the
274interface \s-1MAC\s0 to this value. You will most likely use one of these:
275.Sp
276.Vb 2
277\& ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux
278\& ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD
279.Ve
280.Sp
281Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR manpage for platform-specific information.
282.IP "IFTYPE=native # or tincd" 4 277.IP "IFTYPE=native # or tincd" 4
283.IX Item "IFTYPE=native # or tincd" 278.IX Item "IFTYPE=native # or tincd"
284.PD 0 279.PD 0
285.IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4 280.IP "IFSUBTYPE=linux # or freebsd, darwin etc.." 4
286.IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.." 281.IX Item "IFSUBTYPE=linux # or freebsd, darwin etc.."
287.PD 282.PD
288The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the os 283The interface type (\f(CW\*(C`native\*(C'\fR or \f(CW\*(C`tincd\*(C'\fR) and the subtype (usually the
289name in lowercase) that this gvpe was configured for. Can be used to select 284\&\s-1OS\s0 name in lowercase) that this \s-1GVPE\s0 was configured for. Can be used to
290the correct syntax to use for network-related commands. 285select the correct syntax to use for network-related commands.
286.IP "MTU=1436" 4
287.IX Item "MTU=1436"
288The \s-1MTU\s0 to set the interface to. You can use lower values (if done
289consistently on all nodes), but this is usually either inefficient or
290simply ineffective.
291.IP "NODES=5" 4
292.IX Item "NODES=5"
293The number of nodes in this \s-1GVPE\s0 network.
294.RE
295.RS 4
296.Sp
297Variables that are node-specific and with values pertaining to the node
298running this \s-1GVPE:\s0
299.IP "IFUPDATA=string" 4
300.IX Item "IFUPDATA=string"
301The value of the configuration directive \f(CW\*(C`if\-up\-data\*(C'\fR.
302.IP "MAC=fe:fd:80:00:00:01" 4
303.IX Item "MAC=fe:fd:80:00:00:01"
304The \s-1MAC\s0 address the network interface has to use.
305.Sp
306Might be used to initialize interfaces on platforms where \s-1GVPE\s0 does not
307do this automatically. Please see the \f(CW\*(C`gvpe.osdep(5)\*(C'\fR man page for
308platform-specific information.
291.IP "NODENAME=branch1" 4 309.IP "NODENAME=branch1" 4
292.IX Item "NODENAME=branch1" 310.IX Item "NODENAME=branch1"
293The nickname of the current node, as passed to the gvpe daemon. 311The nickname of the node.
294.IP "NODEID=1" 4 312.IP "NODEID=1" 4
295.IX Item "NODEID=1" 313.IX Item "NODEID=1"
296The numerical node id of the current node. The first node mentioned in the 314The numerical node \s-1ID\s0 of the node running this instance of \s-1GVPE\s0. The first
297config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on. 315node mentioned in the config file gets \s-1ID\s0 1, the second \s-1ID\s0 2 and so on.
298.RE 316.RE
299.RS 4 317.RS 4
300.Sp 318.Sp
319In addition, all node-specific variables (except \f(CW\*(C`NODEID\*(C'\fR) will be
320available with a postfix of \f(CW\*(C`_nodeid\*(C'\fR, which contains the value for that
321node, e.g. the \f(CW\*(C`MAC_1\*(C'\fR variable contains the \s-1MAC\s0 address of node #1, while
322the \f(CW\*(C`NODENAME_22\*(C'\fR variable contains the name of node #22.
323.Sp
301Here is a simple if-up script: 324Here is a simple if-up script:
302.Sp 325.Sp
303.Vb 5 326.Vb 5
304\& #!/bin/sh 327\& #!/bin/sh
305\& ip link set $IFNAME address $MAC mtu $MTU up 328\& ip link set $IFNAME up
306\& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME 329\& [ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
307\& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME 330\& [ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
308\& ip route add 10.0.0.0/8 dev $IFNAME 331\& ip route add 10.0.0.0/8 dev $IFNAME
309.Ve 332.Ve
310.Sp 333.Sp
311More complicated examples (using routing to reduce arp traffic) can be 334More complicated examples (using routing to reduce \s-1ARP\s0 traffic) can be
312found in the etc/ subdirectory of the distribution. 335found in the \fIetc/\fR subdirectory of the distribution.
313.RE 336.RE
314.IP "ifname = devname" 4 337.IP "ifname = devname" 4
315.IX Item "ifname = devname" 338.IX Item "ifname = devname"
316Sets the tun interface name to the given name. The default is OS-specific 339Sets the tun interface name to the given name. The default is OS-specific
317and most probably something like \f(CW\*(C`tun0\*(C'\fR. 340and most probably something like \f(CW\*(C`tun0\*(C'\fR.
… …
324the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the 347the local node, try to set this to \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the
325device. 348device.
326.IP "ip-proto = numerical-ip-protocol" 4 349.IP "ip-proto = numerical-ip-protocol" 4
327.IX Item "ip-proto = numerical-ip-protocol" 350.IX Item "ip-proto = numerical-ip-protocol"
328Sets the protocol number to be used for the rawip protocol. This is a 351Sets the protocol number to be used for the rawip protocol. This is a
329global option because all hosts must use the same protocol, and since 352global option because all nodes must use the same protocol, and since
330there are no port numbers, you cannot easily run more than one gvpe 353there are no port numbers, you cannot easily run more than one gvpe
331instance using the same protocol, nor can you share the protocol with 354instance using the same protocol, nor can you share the protocol with
332other programs. 355other programs.
333.Sp 356.Sp
334The default is 47 (\s-1GRE\s0), which has a good chance of tunneling through 357The default is 47 (\s-1GRE\s0), which has a good chance of tunneling
335firewalls (but note that the rawip protocol is not \s-1GRE\s0 compatible). Other 358through firewalls (but note that gvpe's rawip protocol is not \s-1GRE\s0
336common choices are 50 (\s-1IPSEC\s0, \s-1ESP\s0), 51 (\s-1IPSEC\s0, \s-1AH\s0), 4 (\s-1IPIP\s0 tunnels) or 98 359compatible). Other common choices are 50 (\s-1IPSEC\s0, \s-1ESP\s0), 51 (\s-1IPSEC\s0, \s-1AH\s0), 4
337(\s-1ENCAP\s0, rfc1241) 360(\s-1IPIP\s0 tunnels) or 98 (\s-1ENCAP\s0, rfc1241).
361.Sp
362Many versions of Linux seem to have a bug that causes them to reorder
363packets for some ip protocols (\s-1GRE\s0, \s-1ESP\s0) but not for others (\s-1AH\s0), so
364choose wisely (that is, use 51, \s-1AH\s0).
338.IP "http-proxy-host = hostname/ip" 4 365.IP "http-proxy-host = hostname/ip" 4
339.IX Item "http-proxy-host = hostname/ip" 366.IX Item "http-proxy-host = hostname/ip"
340The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was 367The \f(CW\*(C`http\-proxy\-*\*(C'\fR family of options are only available if gvpe was
341compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of 368compiled with the \f(CW\*(C`\-\-enable\-http\-proxy\*(C'\fR option and enable tunneling of
342tcp connections through a http proxy server. 369tcp connections through a http proxy server.
… …
344\&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and 371\&\f(CW\*(C`http\-proxy\-host\*(C'\fR and \f(CW\*(C`http\-proxy\-port\*(C'\fR should specify the hostname and
345port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy 372port number of the proxy server. See \f(CW\*(C`http\-proxy\-loginpw\*(C'\fR if your proxy
346requires authentication. 373requires authentication.
347.Sp 374.Sp
348Please note that gvpe will still try to resolve all hostnames in the 375Please note that gvpe will still try to resolve all hostnames in the
349configuration file, so if you are behind a proxy without access to a dns 376configuration file, so if you are behind a proxy without access to a \s-1DNS\s0
350server better use numerical \s-1IP\s0 addresses. 377server better use numerical \s-1IP\s0 addresses.
351.Sp 378.Sp
352To make best use of this option disable all protocols except tcp in your 379To make best use of this option disable all protocols except \s-1TCP\s0 in your
353config file and make sure your routers (or all other hosts) are listening 380config file and make sure your routers (or all other nodes) are listening
354on a port that the proxy allows (443, https, is a common choice). 381on a port that the proxy allows (443, https, is a common choice).
355.Sp 382.Sp
356If you have a router, connecting to it will suffice. Otherwise tcp must be 383If you have a router, connecting to it will suffice. Otherwise \s-1TCP\s0 must be
357enabled on all hosts. 384enabled on all nodes.
358.Sp 385.Sp
359Example: 386Example:
360.Sp 387.Sp
361.Vb 3 388.Vb 3
362\& http-proxy-host = proxy.example.com 389\& http\-proxy\-host = proxy.example.com
363\& http-proxy-port = 3128 # 8080 is another common choice 390\& http\-proxy\-port = 3128 # 8080 is another common choice
364\& http-proxy-auth = schmorp:grumbeere 391\& http\-proxy\-auth = schmorp:grumbeere
365.Ve 392.Ve
366.IP "http-proxy-port = proxy-tcp-port" 4 393.IP "http-proxy-port = proxy-tcp-port" 4
367.IX Item "http-proxy-port = proxy-tcp-port" 394.IX Item "http-proxy-port = proxy-tcp-port"
368The port where your proxy server listens. 395The port where your proxy server listens.
369.IP "http-proxy-auth = login:password" 4 396.IP "http-proxy-auth = login:password" 4
370.IX Item "http-proxy-auth = login:password" 397.IX Item "http-proxy-auth = login:password"
371The optional login and password used to authenticate to the proxy server, 398The optional login and password used to authenticate to the proxy server,
372seperated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is 399separated by a literal colon (\f(CW\*(C`:\*(C'\fR). Only basic authentication is
373currently supported. 400currently supported.
374.IP "keepalive = seconds" 4 401.IP "keepalive = seconds" 4
375.IX Item "keepalive = seconds" 402.IX Item "keepalive = seconds"
376Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this 403Sets the keepalive probe interval in seconds (default: \f(CW60\fR). After this
377many seconds of inactivity the daemon will start to send keepalive probe 404many seconds of inactivity the daemon will start to send keepalive probe
378every 5 seconds until it receives a reply from the other end. If no reply 405every 3 seconds until it receives a reply from the other end. If no reply
379is received within 30 seconds, the peer is considered unreachable and the 406is received within 15 seconds, the peer is considered unreachable and the
380connection is closed. 407connection is closed.
381.IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4 408.IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4
382.IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical" 409.IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical"
383Set the logging level. Connection established messages are logged at level 410Set the logging level. Connection established messages are logged at level
384\&\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. 411\&\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.
385.IP "mtu = bytes" 4 412.IP "mtu = bytes" 4
386.IX Item "mtu = bytes" 413.IX Item "mtu = bytes"
387Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically 414Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically
388the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate 415the \s-1MTU\s0 of the outgoing interface) The daemon will automatically calculate
389maximum overhead (e.g. udp header size, encryption blocksize...) and pass 416maximum overhead (e.g. \s-1UDP\s0 header size, encryption blocksize...) and pass
390this information to the \f(CW\*(C`if\-up\*(C'\fR script. 417this information to the \f(CW\*(C`if\-up\*(C'\fR script.
391.Sp 418.Sp
392Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). 419Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).
393.Sp 420.Sp
394This value must be the minimum of the mtu values of all hosts. 421This value must be the minimum of the \s-1MTU\s0 values of all nodes.
395.IP "node = nickname" 4 422.IP "node = nickname" 4
396.IX Item "node = nickname" 423.IX Item "node = nickname"
397Not really a config setting but introduces a node section. The nickname is 424Not really a config setting but introduces a node section. The nickname is
398used to select the right configuration section and must be passed as an 425used to select the right configuration section and must be passed as an
399argument to the gvpe daemon. 426argument to the gvpe daemon.
400.IP "node-up = relative-or-absolute-path" 4 427.IP "node-up = relative-or-absolute-path" 4
401.IX Item "node-up = relative-or-absolute-path" 428.IX Item "node-up = relative-or-absolute-path"
402Sets a command (default: no script) that should be called whenever a 429Sets a command (default: none) that should be called whenever a connection
403connection is established (even on rekeying operations). In addition 430is established (even on rekeying operations). Note that node\-up/down
431scripts will be run asynchronously, but execution is serialised, so there
432will only ever be one such script running.
433.Sp
404to the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following environment 434In addition to all the variables passed to \f(CW\*(C`if\-up\*(C'\fR scripts, the following
405variables will be set: 435environment variables will be set (values are just examples):
406.RS 4 436.RS 4
407.IP "DESTNODE=branch2" 4 437.IP "DESTNODE=branch2" 4
408.IX Item "DESTNODE=branch2" 438.IX Item "DESTNODE=branch2"
409The name of the remote node. 439The name of the remote node.
410.IP "DESTID=2" 4 440.IP "DESTID=2" 4
411.IX Item "DESTID=2" 441.IX Item "DESTID=2"
412The node id of the remote node. 442The node id of the remote node.
443.IP "DESTSI=rawip/88.99.77.55:0" 4
444.IX Item "DESTSI=rawip/88.99.77.55:0"
445The \*(L"socket info\*(R" of the target node, protocol dependent but usually in
446the format protocol/ip:port.
413.IP "DESTIP=188.13.66.8" 4 447.IP "DESTIP=188.13.66.8" 4
414.IX Item "DESTIP=188.13.66.8" 448.IX Item "DESTIP=188.13.66.8"
415The numerical \s-1IP\s0 address of the remote host (gvpe accepts connections from 449The numerical \s-1IP\s0 address of the remote node (gvpe accepts connections from
416everywhere, as long as the other host can authenticate itself). 450everywhere, as long as the other node can authenticate itself).
417.IP "DESTPORT=655 # deprecated" 4 451.IP "DESTPORT=655 # deprecated" 4
418.IX Item "DESTPORT=655 # deprecated" 452.IX Item "DESTPORT=655 # deprecated"
419The \s-1UDP\s0 port used by the other side. 453The protocol port used by the other side, if applicable.
420.IP "STATE=UP" 4 454.IP "STATE=up" 4
421.IX Item "STATE=UP" 455.IX Item "STATE=up"
422Node-up scripts get called with STATE=UP, node-down scripts get called 456Node-up scripts get called with STATE=up, node-change scripts get called
423with STATE=DOWN. 457with STATE=change and node-down scripts get called with STATE=down.
424.RE 458.RE
425.RS 4 459.RS 4
426.Sp 460.Sp
427Here is a nontrivial example that uses nsupdate to update the name => ip 461Here is a nontrivial example that uses nsupdate to update the name => ip
428mapping in some dns zone: 462mapping in some \s-1DNS\s0 zone:
429.Sp 463.Sp
430.Vb 6 464.Vb 6
431\& #!/bin/sh 465\& #!/bin/sh
432\& { 466\& {
433\& echo update delete $DESTNODE.lowttl.example.net. a 467\& echo update delete $DESTNODE.lowttl.example.net. a
434\& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP 468\& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP
435\& echo 469\& echo
436\& } | nsupdate -d -k $CONFBASE:key.example.net. 470\& } | nsupdate \-d \-k $CONFBASE:key.example.net.
437.Ve 471.Ve
438.RE 472.RE
473.IP "node-change = relative-or-absolute-path" 4
474.IX Item "node-change = relative-or-absolute-path"
475Same as \f(CW\*(C`node\-change\*(C'\fR, but gets called whenever something about a
476connection changes (such as the source \s-1IP\s0 address).
439.IP "node-down = relative-or-absolute-path" 4 477.IP "node-down = relative-or-absolute-path" 4
440.IX Item "node-down = relative-or-absolute-path" 478.IX Item "node-down = relative-or-absolute-path"
441Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost. 479Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost.
442.IP "pid-file = path" 4 480.IP "pid-file = path" 4
443.IX Item "pid-file = path" 481.IX Item "pid-file = path"
… …
450be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could 488be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could
451use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where 489use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where
452\&\f(CW\*(C`gvpectrl\*(C'\fR puts them. 490\&\f(CW\*(C`gvpectrl\*(C'\fR puts them.
453.Sp 491.Sp
454Since only the private key file of the current node is used and the 492Since only the private key file of the current node is used and the
455private key file should be kept secret per-host to avoid spoofings, it is 493private key file should be kept secret per-node to avoid spoofing, it is
456not recommended to use this feature. 494not recommended to use this feature.
457.IP "rekey = seconds" 4 495.IP "rekey = seconds" 4
458.IX Item "rekey = seconds" 496.IX Item "rekey = seconds"
459Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are 497Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are
460reestablished every \f(CW\*(C`rekey\*(C'\fR seconds. 498reestablished every \f(CW\*(C`rekey\*(C'\fR seconds, making them use a new encryption
499key.
500.IP "nfmark = integer" 4
501.IX Item "nfmark = integer"
502This advanced option, when set to a nonzero value (default: \f(CW0\fR), tries
503to set the netfilter mark (or fwmark) value on all sockets gvpe uses to
504send packets.
505.Sp
506This can be used to make gvpe use a different set of routing rules. For
507example, on GNU/Linux, the \f(CW\*(C`if\-up\*(C'\fR could set \f(CW\*(C`nfmark\*(C'\fR to 1000 and then
508put all routing rules into table \f(CW99\fR and then use an ip rule to make
509gvpe traffic avoid that routing table, in effect routing normal traffic
510via gvpe and gvpe traffic via the normal system routing tables:
511.Sp
512.Vb 1
513\& ip rule add not fwmark 1000 lookup 99
514.Ve
461.Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0" 515.Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0"
462.IX Subsection "NODE SPECIFIC SETTINGS" 516.IX Subsection "NODE SPECIFIC SETTINGS"
463The following settings are node\-specific, that is, every node can have 517The following settings are node\-specific, that is, every node can have
464different settings, even within the same gvpe instance. Settings that are 518different settings, even within the same gvpe instance. Settings that are
465executed before the first node section set the defaults, settings that are 519set before the first node section set the defaults, settings that are
466executed within a node section only apply to the given node. 520set within a node section only apply to the given node.
521.IP "allow-direct = nodename" 4
522.IX Item "allow-direct = nodename"
523Allow direct connections to this node. See \f(CW\*(C`deny\-direct\*(C'\fR for more info.
467.IP "compress = yes|true|on | no|false|off" 4 524.IP "compress = yes|true|on | no|false|off" 4
468.IX Item "compress = yes|true|on | no|false|off" 525.IX Item "compress = yes|true|on | no|false|off"
526For the current node, this specified whether it will accept compressed
527packets, and for all other nodes, this specifies whether to try to
469Wether to compress data packets sent to this host (default: \f(CW\*(C`yes\*(C'\fR). 528compress data packets sent to this node (default: \f(CW\*(C`yes\*(C'\fR). Compression is
470Compression is really cheap even on slow computers and has no size 529really cheap even on slow computers, has no size overhead at all and will
471overhead at all, so enabling this is a good idea. 530only be used when the other side supports compression, so enabling this is
531often a good idea.
472.IP "connect = ondemand | never | always | disabled" 4 532.IP "connect = ondemand | never | always | disabled" 4
473.IX Item "connect = ondemand | never | always | disabled" 533.IX Item "connect = ondemand | never | always | disabled"
474Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always 534Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always
475try to establish and keep a connection to the given host), \f(CW\*(C`never\*(C'\fR 535try to establish and keep a connection to the given node), \f(CW\*(C`never\*(C'\fR
476(never initiate a connection to the given host, but accept connections), 536(never initiate a connection to the given host, but accept connections),
477\&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection on the first packet sent, and 537\&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection when there are outstanding
478take it down after the keepalive interval) or \f(CW\*(C`disabled\*(C'\fR (node is bad, 538packets in the queue and take it down after the keepalive interval) or
479don't talk to it). 539\&\f(CW\*(C`disabled\*(C'\fR (node is bad, don't talk to it).
540.Sp
541Routers will automatically be forced to \f(CW\*(C`always\*(C'\fR unless they are
542\&\f(CW\*(C`disabled\*(C'\fR, to ensure all nodes can talk to each other.
543.IP "deny-direct = nodename | *" 4
544.IX Item "deny-direct = nodename | *"
545Deny direct connections to the specified node (or all nodes when \f(CW\*(C`*\*(C'\fR
546is given). Only one node can be specified, but you can use multiple
547\&\f(CW\*(C`allow\-direct\*(C'\fR and \f(CW\*(C`deny\-direct\*(C'\fR statements. This only makes sense in
548networks with routers, as routers are required for indirect connections.
549.Sp
550Sometimes, a node cannot reach some other nodes for reasons of network
551connectivity. For example, a node behind a firewall that only allows
552connections to/from a single other node in the network. In this case one
553should specify \f(CW\*(C`deny\-direct = *\*(C'\fR and \f(CW\*(C`allow\-direct = othernodename\*(C'\fR (the other
554node \fImust\fR be a router for this to work).
555.Sp
556The algorithm to check whether a connection may be direct is as follows:
557.Sp
5581. Other node mentioned in an \f(CW\*(C`allow\-direct\*(C'\fR? If yes, allow the connection.
559.Sp
5602. Other node mentioned in a \f(CW\*(C`deny\-direct\*(C'\fR? If yes, deny direct connections.
561.Sp
5623. Allow the connection.
563.Sp
564That is, \f(CW\*(C`allow\-direct\*(C'\fR takes precedence over \f(CW\*(C`deny\-direct\*(C'\fR.
565.Sp
566The check is done in both directions, i.e. both nodes must allow a direct
567connection before one is attempted, so you only need to specify connect
568limitations on one node.
480.IP "dns-domain = domain-suffix" 4 569.IP "dns-domain = domain-suffix" 4
481.IX Item "dns-domain = domain-suffix" 570.IX Item "dns-domain = domain-suffix"
482The \s-1DNS\s0 domain suffix that points to the \s-1DNS\s0 tunnel server for this node. 571The \s-1DNS\s0 domain suffix that points to the \s-1DNS\s0 tunnel server for this node.
483.Sp 572.Sp
484The domain must point to a \s-1NS\s0 record that points to the \fIdns-hostname\fR, 573The domain must point to a \s-1NS\s0 record that points to the \fIdns-hostname\fR,
485i.e. 574i.e.
486.Sp 575.Sp
487.Vb 2 576.Vb 2
488\& dns-domainname = tunnel.example.net 577\& dns\-domainname = tunnel.example.net
489\& dns-hostname = tunnel-server.example.net 578\& dns\-hostname = tunnel\-server.example.net
490.Ve 579.Ve
491.Sp 580.Sp
492Corresponds to the following \s-1DNS\s0 entries in the \f(CW\*(C`example.net\*(C'\fR domain: 581Corresponds to the following \s-1DNS\s0 entries in the \f(CW\*(C`example.net\*(C'\fR domain:
493.Sp 582.Sp
494.Vb 2 583.Vb 2
495\& tunnel.example.net. NS tunnel-server.example.net. 584\& tunnel.example.net. NS tunnel\-server.example.net.
496\& tunnel-server.example.net. A 13.13.13.13 585\& tunnel\-server.example.net. A 13.13.13.13
497.Ve 586.Ve
498.IP "dns-hostname = hostname/ip" 4 587.IP "dns-hostname = hostname/ip" 4
499.IX Item "dns-hostname = hostname/ip" 588.IX Item "dns-hostname = hostname/ip"
500The address to bind the \s-1DNS\s0 tunnel socket to, similar to the \f(CW\*(C`hostname\*(C'\fR, 589The address to bind the \s-1DNS\s0 tunnel socket to, similar to the \f(CW\*(C`hostname\*(C'\fR,
501but for the \s-1DNS\s0 tunnel protocol only. Default: \f(CW0.0.0.0\fR, but that might 590but for the \s-1DNS\s0 tunnel protocol only. Default: \f(CW0.0.0.0\fR, but that might
… …
513was compiled using the \f(CW\*(C`\-\-enable\-dns\*(C'\fR option. 602was compiled using the \f(CW\*(C`\-\-enable\-dns\*(C'\fR option.
514.IP "enable-icmp = yes|true|on | no|false|off" 4 603.IP "enable-icmp = yes|true|on | no|false|off" 4
515.IX Item "enable-icmp = yes|true|on | no|false|off" 604.IX Item "enable-icmp = yes|true|on | no|false|off"
516See \fIgvpe.protocol\fR\|(7) for a description of the \s-1ICMP\s0 transport protocol. 605See \fIgvpe.protocol\fR\|(7) for a description of the \s-1ICMP\s0 transport protocol.
517.Sp 606.Sp
518Enable the \s-1ICMP\s0 transport using icmp packets of type \f(CW\*(C`icmp\-type\*(C'\fR on this 607Enable the \s-1ICMP\s0 transport using \s-1ICMP\s0 packets of type \f(CW\*(C`icmp\-type\*(C'\fR on this
519node. 608node.
520.IP "enable-rawip = yes|true|on | no|false|off" 4 609.IP "enable-rawip = yes|true|on | no|false|off" 4
521.IX Item "enable-rawip = yes|true|on | no|false|off" 610.IX Item "enable-rawip = yes|true|on | no|false|off"
522See \fIgvpe.protocol\fR\|(7) for a description of the \s-1RAW\s0 \s-1IP\s0 transport protocol. 611See \fIgvpe.protocol\fR\|(7) for a description of the \s-1RAW\s0 \s-1IP\s0 transport protocol.
523.Sp 612.Sp
… …
532when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option. 621when gvpe was compiled using the \f(CW\*(C`\-\-enable\-tcp\*(C'\fR option.
533.IP "enable-udp = yes|true|on | no|false|off" 4 622.IP "enable-udp = yes|true|on | no|false|off" 4
534.IX Item "enable-udp = yes|true|on | no|false|off" 623.IX Item "enable-udp = yes|true|on | no|false|off"
535See \fIgvpe.protocol\fR\|(7) for a description of the \s-1UDP\s0 transport protocol. 624See \fIgvpe.protocol\fR\|(7) for a description of the \s-1UDP\s0 transport protocol.
536.Sp 625.Sp
537Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`no\*(C'\fR, 626Enable the UDPv4 transport using the \f(CW\*(C`udp\-port\*(C'\fR port (default: \f(CW\*(C`no\*(C'\fR).
538unless no other protocol is enabled for a node, in which case this 627.IP "hostname = hostname | ip [can not be defaulted]" 4
539protocol is enabled automatically). 628.IX Item "hostname = hostname | ip [can not be defaulted]"
629Forces the address of this node to be set to the given \s-1DNS\s0 hostname or \s-1IP\s0
630address. It will be resolved before each connect request, so dyndns should
631work fine. If this setting is not specified and a router is available,
632then the router will be queried for the address of this node. Otherwise,
633the connection attempt will fail.
540.Sp 634.Sp
541\&\s-1NOTE:\s0 Please specify \f(CW\*(C`enable\-udp = yes\*(C'\fR if you want t use it even though 635Note that \s-1DNS\s0 resolving is done synchronously, pausing the daemon. If that
542it might get switched on automatically, as some future version might 636is an issue you need to specify \s-1IP\s0 addresses.
543default to another default protocol.
544.IP "icmp-type = integer" 4 637.IP "icmp-type = integer" 4
545.IX Item "icmp-type = integer" 638.IX Item "icmp-type = integer"
546Sets the type value to be used for outgoing (and incoming) packets sent 639Sets the type value to be used for outgoing (and incoming) packets sent
547via the \s-1ICMP\s0 transport. 640via the \s-1ICMP\s0 transport.
548.Sp 641.Sp
549The default is \f(CW0\fR (which is \f(CW\*(C`echo\-reply\*(C'\fR, also known as 642The default is \f(CW0\fR (which is \f(CW\*(C`echo\-reply\*(C'\fR, also known as
550\&\*(L"ping\-replies\*(R"). Other useful values include \f(CW8\fR (\f(CW\*(C`echo\-request\*(C'\fR, a.k.a. 643\&\*(L"ping\-reply\*(R"). Other useful values include \f(CW8\fR (\f(CW\*(C`echo\-request\*(C'\fR, a.k.a.
551\&\*(L"ping\*(R") and \f(CW11\fR (\f(CW\*(C`time\-exceeded\*(C'\fR), but any 8\-bit value can be used. 644\&\*(L"ping\*(R") and \f(CW11\fR (\f(CW\*(C`time\-exceeded\*(C'\fR), but any 8\-bit value can be used.
645.IP "if-up-data = value" 4
646.IX Item "if-up-data = value"
647The value specified using this directive will be passed to the \f(CW\*(C`if\-up\*(C'\fR
648script in the environment variable \f(CW\*(C`IFUPDATA\*(C'\fR.
552.IP "inherit-tos = yes|true|on | no|false|off" 4 649.IP "inherit-tos = yes|true|on | no|false|off" 4
553.IX Item "inherit-tos = yes|true|on | no|false|off" 650.IX Item "inherit-tos = yes|true|on | no|false|off"
554Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when 651Whether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when
555sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then 652sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then
556outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent 653outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent
557to the tunnel device, which is usually what you want. 654to the tunnel device, which is usually what you want.
558.IP "max-retry = positive-number" 4 655.IP "max-retry = positive-number" 4
559.IX Item "max-retry = positive-number" 656.IX Item "max-retry = positive-number"
560The maximum interval in seconds (default: \f(CW3600\fR, one hour) between 657The maximum interval in seconds (default: \f(CW3600\fR, one hour) between
561retries to establish a connection to this node. When a connection cannot 658retries to establish a connection to this node. When a connection cannot
562be established, gvpe uses exponential backoff capped at this value. It's 659be established, gvpe uses exponential back-off capped at this value. It's
563sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on 660sometimes useful to set this to a much lower value (e.g. \f(CW120\fR) on
564connections to routers that usually are stable but sometimes are down, to 661connections to routers that usually are stable but sometimes are down, to
565assure quick reconnections even after longer downtimes. 662assure quick reconnections even after longer downtimes.
663.IP "max-ttl = seconds" 4
664.IX Item "max-ttl = seconds"
665Expire packets that couldn't be sent after this many seconds
666(default: \f(CW60\fR). Gvpe will normally queue packets for a node without an
667active connection, in the hope of establishing a connection soon. This
668value specifies the maximum lifetime a packet will stay in the queue, if a
669packet gets older, it will be thrown away.
670.IP "max-queue = positive\-number>=1" 4
671.IX Item "max-queue = positive-number>=1"
672The maximum number of packets that will be queued (default: \f(CW512\fR)
673for this node. If more packets are sent then earlier packets will be
674expired. See \f(CW\*(C`max\-ttl\*(C'\fR, above.
566.IP "router-priority = 0 | 1 | positive\-number>=2" 4 675.IP "router-priority = 0 | 1 | positive\-number>=2" 4
567.IX Item "router-priority = 0 | 1 | positive-number>=2" 676.IX Item "router-priority = 0 | 1 | positive-number>=2"
568Sets the router priority of the given host (default: \f(CW0\fR, disabled). If 677Sets the router priority of the given node (default: \f(CW0\fR, disabled).
569some host tries to connect to another host without a hostname, it asks
570the router host for it's \s-1IP\s0 address. The router host is the one with the
571highest priority larger than \f(CW1\fR that is currently reachable.
572.Sp 678.Sp
573Make sure all hosts always connect (\f(CW\*(C`connect = always\*(C'\fR) to the router 679If some node tries to connect to another node but it doesn't have a
574hosts, otherwise connecting to them might be impossible. 680hostname, it asks a router node for it's \s-1IP\s0 address. The router node
681chosen is the one with the highest priority larger than \f(CW1\fR that is
682currently reachable. This is called a \fImediated\fR connection, as the
683connection itself will still be direct, but it uses another node to
684mediate between the two nodes.
685.Sp
686The value \f(CW0\fR disables routing, that means if the node receives a packet
687not for itself it will not forward it but instead drop it.
575.Sp 688.Sp
576The special value \f(CW1\fR allows other hosts to route through the router 689The special value \f(CW1\fR allows other hosts to route through the router
577host, but they will never route through it by default. The value \f(CW0\fR 690host, but they will never route through it by default (i.e. the config
578disables routing. The idea behind this is that some hosts can, if 691file of another node needs to specify a router priority higher than one
692to choose such a node for routing).
693.Sp
694The idea behind this is that some hosts can, if required, bump the
579required, bump the \f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their 695\&\f(CW\*(C`router\-priority\*(C'\fR setting to higher than \f(CW1\fR in their local config to
580local config to route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is 696route through specific hosts. If \f(CW\*(C`router\-priority\*(C'\fR is \f(CW0\fR, then routing
581\&\f(CW0\fR, then routing will be refused, so \f(CW1\fR serves as a \*(L"enable, but do 697will be refused, so \f(CW1\fR serves as a \*(L"enable, but do not use by default\*(R"
582not use by default\*(R" switch. 698switch.
699.Sp
700Nodes with \f(CW\*(C`router\-priority\*(C'\fR set to \f(CW2\fR or higher will always be forced
701to \f(CW\*(C`connect\*(C'\fR = \f(CW\*(C`always\*(C'\fR (unless they are \f(CW\*(C`disabled\*(C'\fR).
583.IP "tcp-port = port-number" 4 702.IP "tcp-port = port-number" 4
584.IX Item "tcp-port = port-number" 703.IX Item "tcp-port = port-number"
585Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number. 704Similar to \f(CW\*(C`udp\-port\*(C'\fR (default: \f(CW655\fR), but sets the \s-1TCP\s0 port number.
586.IP "udp-port = port-number" 4 705.IP "udp-port = port-number" 4
587.IX Item "udp-port = port-number" 706.IX Item "udp-port = port-number"
588Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not 707Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW655\fR, not
589officially assigned by \s-1IANA\s0!). 708officially assigned by \s-1IANA\s0!).
590.SH "CONFIG DIRECTORY LAYOUT" 709.SH "CONFIG DIRECTORY LAYOUT"
591.IX Header "CONFIG DIRECTORY LAYOUT" 710.IX Header "CONFIG DIRECTORY LAYOUT"
592The default (or recommended) directory layout for the config directory is: 711The default (or recommended) directory layout for the config directory is:
593.IP "\(bu" 4 712.IP "gvpe.conf" 4
594.IX Xref "gvpe.conf" 713.IX Item "gvpe.conf"
595The config file. 714The config file.
596.IP "\(bu" 4 715.IP "if-up" 4
597.IX Xref "if-up" 716.IX Item "if-up"
598The if-up script 717The if-up script
599.IP "," 4 718.IP "node\-up, node-down" 4
600.IX Xref "node-up node-down" 719.IX Item "node-up, node-down"
601If used the node up or node-down scripts. 720If used the node up or node-down scripts.
602.IP "\(bu" 4 721.IP "hostkey" 4
603.IX Xref "hostkey" 722.IX Item "hostkey"
604The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host. 723The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host.
605.IP "\(bu" 4 724.IP "pubkey/nodename" 4
606.IX Xref "pubkey nodename" 725.IX Item "pubkey/nodename"
607The public keys of the other nodes, one file per node. 726The public keys of the other nodes, one file per node.
608.SH "SEE ALSO" 727.SH "SEE ALSO"
609.IX Header "SEE ALSO" 728.IX Header "SEE ALSO"
610\&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8). 729\&\fIgvpe\fR\|(5), \fIgvpe\fR\|(8), \fIgvpectrl\fR\|(8).
611.SH "AUTHOR" 730.SH "AUTHOR"
612.IX Header "AUTHOR" 731.IX Header "AUTHOR"
613Marc Lehmann <gvpe@plan9.de> 732Marc Lehmann <gvpe@schmorp.de>

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