[ViewVC] Diff of: cvs/gvpe/doc/gvpe.conf.5.pod

Comparing gvpe/doc/gvpe.conf.5.pod (file contents):
Revision 1.4 by pcg, Thu Jan 27 06:16:16 2005 UTC vs.
Revision 1.36 by root, Thu Jun 25 09:09:29 2015 UTC

…		…
2		2
3	gvpe.conf - configuration file for the GNU VPE daemon	3	gvpe.conf - configuration file for the GNU VPE daemon
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	enable-udp = yes	7	# global options for all nodes
8	udp-port = 407	8	udp-port = 407
9	mtu = 1492	9	mtu = 1492
10	ifname = vpn0	10	ifname = vpn0
11		11
		12	# first node is named branch1 and is at 1.2.3.4
12	node = branch1	13	node = branch1
13	hostname = 1.2.3.4	14	hostname = 1.2.3.4
14		15
		16	# second node uses dns to resolve the address
15	node = branch2	17	node = branch2
16	hostname = www.example.net	18	hostname = www.example.net
17	udp-port = 500 # this host uses a different udp-port	19	udp-port = 500 # this host uses a different udp-port
18		20
		21	# third node has no fixed ip address
19	node = branch3	22	node = branch3
20	connect = ondemand	23	connect = ondemand
21		24
22	=head1 DESCRIPTION	25	=head1 DESCRIPTION
23		26
24	The gvpe config file consists of a series of lines that contain C<variable	27	The gvpe config file consists of a series of lines that contain C<variable
25	= value> pairs. Empty lines are ignored. Comments start with a C<#> and	28	= value> pairs. Empty lines are ignored. Comments start with a C<#> and
26	extend to the end of the line. They can be used on their own lines, or	29	extend to the end of the line. They can be used on their own lines, or
27	after any directives. Spaces are allowed before or after the C<=> sign or	30	after any directives. Whitespace is allowed around the C<=> sign or after
28	after values, but not within the variable names or values themselves.	31	values, but not within the variable names or values themselves.
29		32
30	The only exception to the above is the "on" directive that can prefix any	33	All settings are applied "in order", that is, later settings of the same
31	C<name = value> setting and will only "execute" it on the named node, or	34	variable overwrite earlier ones.
32	(if the nodename starts with "!") on all nodes except the named one.
33		35
34	name = value	36	The only exceptions to the above are the following directives:
		37
		38	=over 4
		39
		40	=item node nodename
		41
		42	Introduces a node section. The nodename is used to select the right
		43	configuration section and is the same string as is passed as an argument
		44	to the gvpe daemon.
		45
		46	Multiple C<node> statements with the same node name are supported and will
		47	be merged together.
		48
		49	=item global
		50
		51	This statement switches back to the global section, which is mainly
		52	useful if you want to include a second config file, e..g for local
		53	customisations. To do that, simply include this at the very end of your
		54	config file:
		55
		56	global
		57	include local.conf
		58
		59	=item on nodename ...
		60
		61	=item on !nodename ...
		62
		63	You can prefix any configuration directive with C<on> and a nodename. GVPE
		64	will will only "execute" it on the named node, or (if the nodename starts
		65	with C<!>) on all nodes except the named one.
		66
		67	Example: set the MTU to C<1450> everywhere, C<loglevel> to C<noise> on
		68	C<branch1>, and C<connect> to C<ondemand> everywhere but on branch2.
		69
		70	mtu = 1450
35	on branch1 loglevel = noise	71	on branch1 loglevel = noise
36	on !branch2 connect = ondemand	72	on !branch2 connect = ondemand
37		73
38	All settings are executed "in order", that is, later settings of the same	74	=item include relative-or-absolute-path
39	variable overwrite earlier ones.	75
		76	Reads the specified file (the path must not contain whitespace or C<=>
		77	characters) and evaluate all config directives in it as if they were
		78	spelled out in place of the C<include> directive.
		79
		80	The path is a printf format string, that is, you must escape any C<%>
		81	by doubling it, and you can have a single C<%s> inside, which will be
		82	replaced by the current nodename.
		83
		84	Relative paths are interpreted relative to the GVPE config directory.
		85
		86	Example: include the file F<local.conf> in the config directory on every
		87	node.
		88
		89	include local.conf
		90
		91	Example: include a file F<conf/>nodenameF<.conf>
		92
		93	include conf/%s.conf
		94
		95	=back
40		96
41	=head1 ANATOMY OF A CONFIG FILE	97	=head1 ANATOMY OF A CONFIG FILE
42		98
43	Usually, a config file starts with global settings (like the udp port to	99	Usually, a config file starts with a few global settings (like the UDP
44	listen on), followed by node-specific sections that begin with a C<node =	100	port to listen on), followed by node-specific sections that begin with a
45	nickname> line.	101	C<node = nickname> line.
46		102
47	Every node that is part of the network must have a section that starts	103	Every node that is part of the network must have a section that starts
48	with C<node = nickname>. The number and order of the nodes is important	104	with C<node = nickname>. The number and order of the nodes is important
49	and must be the same on all hosts. It is not uncommon for node sections to	105	and must be the same on all nodes. It is not uncommon for node sections to
50	be completely empty - if the default values are right.	106	be completely empty - if the default values are right.
51		107
52	Node-specific settings can be used at any time. If used before the first	108	Node-specific settings can be used at any time. If used before the first
53	node section they will set the default values for all following nodes.	109	node section they will set the default values for all following nodes.
54		110
…		…
61	values on different nodes using C<on>), but will affect the behaviour of	117	values on different nodes using C<on>), but will affect the behaviour of
62	the gvpe daemon and all connections it creates.	118	the gvpe daemon and all connections it creates.
63		119
64	=over 4	120	=over 4
65		121
66	=item loglevel = noise\|trace\|debug\|info\|notice\|warn\|error\|critical	122	=item chroot = path or /
67		123
68	Set the logging level. Connection established messages are logged at level	124	Tells GVPE to chroot(2) to the specified path after reading all necessary
69	C<info>, notable errors are logged with C<error>. Default is C<info>.	125	files, binding to sockets and running the C<if-up> script, but before
		126	running C<node-up> or any other scripts.
70		127
71	=item node = nickname	128	The special path F</> instructs GVPE to create (and remove) an empty
		129	temporary directory to use as new root. This is most secure, but makes it
		130	impossible to use any scripts other than the C<if-up> one.
72		131
73	Not really a config setting but introduces a node section. The nickname is	132	=item chuid = numerical-uid
74	used to select the right configuration section and must be passed as an
75	argument to the gvpe daemon.
76		133
77	=item private-key = relative-path-to-key	134	=item chgid = numerical-gid
78		135
79	Sets the path (relative to the config directory) to the private key	136	These two options tell GVPE to change to the given user and/or group id
80	(default: C<hostkey>). This is a printf format string so every C<%> must	137	after reading all necessary files, binding to sockets and running the
81	be doubled. A single C<%s> is replaced by the hostname, so you could	138	C<if-up> script.
82	use paths like C<hostkeys/%s> to fetch the files at the location where
83	C<gvpectrl> puts them.
84		139
85	Since only the private key file of the current node is used and the	140	Other scripts, such as C<node-up>, are run with the new user id or group id.
86	private key file should be kept secret per-host to avoid spoofings, it is	141
87	not recommended to use this feature.	142	=item chuser = username
		143
		144	Alternative to C<chuid> and C<chgid>: Sets both C<chuid> and C<chgid>
		145	to the user and (primary) group ids of the specified user (for example,
		146	C<nobody>).
		147
		148	=item dns-forw-host = hostname/ip
		149
		150	The DNS server to forward DNS requests to for the DNS tunnel protocol
		151	(default: C<127.0.0.1>, changing it is highly recommended).
		152
		153	=item dns-forw-port = port-number
		154
		155	The port where the C<dns-forw-host> is to be contacted (default: C<53>,
		156	which is fine in most cases).
		157
		158	=item dns-case-preserving = yes\|true\|on \| no\|false\|off
		159
		160	Sets whether the DNS transport forwarding server preserves case (DNS
		161	servers have to, but some access systems are even more broken than others)
		162	(default: true).
		163
		164	Normally, when the forwarding server changes the case of domain names then
		165	GVPE will automatically set this to false.
		166
		167	=item dns-max-outstanding = integer-number-of-requests
		168
		169	The maximum number of outstanding DNS transport requests
		170	(default: C<100>). GVPE will never issue more requests then the given
		171	limit without receiving replies. In heavily overloaded situations it might
		172	help to set this to a low number (e.g. C<3> or even C<1>) to limit the
		173	number of parallel requests.
		174
		175	The default should be working OK for most links.
		176
		177	=item dns-overlap-factor = float
		178
		179	The DNS transport uses the minimum request latency (B<min_latency>) seen
		180	during a connection as it's timing base. This factor (default: C<0.5>,
		181	must be > 0) is multiplied by B<min_latency> to get the maximum sending
		182	rate (= minimum send interval), i.e. a factor of C<1> means that a new
		183	request might be generated every B<min_latency> seconds, which means on
		184	average there should only ever be one outstanding request. A factor of
		185	C<0.5> means that GVPE will send requests twice as often as the minimum
		186	latency measured.
		187
		188	For congested or picky DNS forwarders you could use a value nearer to or
		189	exceeding C<1>.
		190
		191	The default should be working OK for most links.
		192
		193	=item dns-send-interval = send-interval-in-seconds
		194
		195	The minimum send interval (= maximum rate) that the DNS transport will
		196	use to send new DNS requests. GVPE will not exceed this rate even when
		197	the latency is very low. The default is C<0.01>, which means GVPE will
		198	not send more than 100 DNS requests per connection per second. For
		199	high-bandwidth links you could go lower, e.g. to C<0.001> or so. For
		200	congested or rate-limited links, you might want to go higher, say C<0.1>,
		201	C<0.2> or even higher.
		202
		203	The default should be working OK for most links.
		204
		205	=item dns-timeout-factor = float
		206
		207	Factor to multiply the C<min_latency> (see C<dns-overlap-factor>) by to
		208	get request timeouts. The default of C<8> means that the DNS transport
		209	will resend the request when no reply has been received for longer than
		210	eight times the minimum (= expected) latency, assuming the request or
		211	reply has been lost.
		212
		213	For congested links a higher value might be necessary (e.g. C<30>). If
		214	the link is very stable lower values (e.g. C<2>) might work
		215	nicely. Values near or below C<1> makes no sense whatsoever.
		216
		217	The default should be working OK for most links but will result in low
		218	throughput if packet loss is high.
		219
		220	=item if-up = relative-or-absolute-path
		221
		222	Sets the path of a script that should be called immediately after the
		223	network interface is initialized (but not necessarily up). The following
		224	environment variables are passed to it (the values are just examples).
		225
		226	Variables that have the same value on all nodes:
		227
		228	=over 4
		229
		230	=item CONFBASE=/etc/gvpe
		231
		232	The configuration base directory.
		233
		234	=item IFNAME=vpn0
		235
		236	The network interface to initialize.
		237
		238	=item IFTYPE=native # or tincd
		239
		240	=item IFSUBTYPE=linux # or freebsd, darwin etc..
		241
		242	The interface type (C<native> or C<tincd>) and the subtype (usually the
		243	OS name in lowercase) that this GVPE was configured for. Can be used to
		244	select the correct syntax to use for network-related commands.
		245
		246	=item MTU=1436
		247
		248	The MTU to set the interface to. You can use lower values (if done
		249	consistently on all nodes), but this is usually either inefficient or
		250	simply ineffective.
		251
		252	=item NODES=5
		253
		254	The number of nodes in this GVPE network.
		255
		256	=back
		257
		258	Variables that are node-specific and with values pertaining to the node
		259	running this GVPE:
		260
		261	=over 4
		262
		263	=item IFUPDATA=string
		264
		265	The value of the configuration directive C<if-up-data>.
		266
		267	=item MAC=fe:fd:80:00:00:01
		268
		269	The MAC address the network interface has to use.
		270
		271	Might be used to initialize interfaces on platforms where GVPE does not
		272	do this automatically. Please see the C<gvpe.osdep(5)> man page for
		273	platform-specific information.
		274
		275	=item NODENAME=branch1
		276
		277	The nickname of the node.
		278
		279	=item NODEID=1
		280
		281	The numerical node ID of the node running this instance of GVPE. The first
		282	node mentioned in the config file gets ID 1, the second ID 2 and so on.
		283
		284	=back
		285
		286	In addition, all node-specific variables (except C<NODEID>) will be
		287	available with a postfix of C<_nodeid>, which contains the value for that
		288	node, e.g. the C<MAC_1> variable contains the MAC address of node #1, while
		289	the C<NODENAME_22> variable contains the name of node #22.
		290
		291	Here is a simple if-up script:
		292
		293	#!/bin/sh
		294	ip link set $IFNAME up
		295	[ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
		296	[ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
		297	ip route add 10.0.0.0/8 dev $IFNAME
		298
		299	More complicated examples (using routing to reduce ARP traffic) can be
		300	found in the F<etc/> subdirectory of the distribution.
		301
		302	=item ifname = devname
		303
		304	Sets the tun interface name to the given name. The default is OS-specific
		305	and most probably something like C<tun0>.
88		306
89	=item ifpersist = yes\|true\|on \| no\|false\|off	307	=item ifpersist = yes\|true\|on \| no\|false\|off
90		308
91	Should the tun/tap device be made persistent, that is, should the device	309	Should the tun/tap device be made persistent, that is, should the device
92	stay up even when gvpe exits? Some versions of the tunnel device have	310	stay up even when gvpe exits? Some versions of the tunnel device have
93	problems sending packets when gvpe is restarted in persistent mode, so	311	problems sending packets when gvpe is restarted in persistent mode, so
94	if the connections can be established but you cannot send packets from	312	if the connections can be established but you cannot send packets from
95	the local node, try to set this to C<off> and do an ifconfig down on the	313	the local node, try to set this to C<off> and do an ifconfig down on the
96	device.	314	device.
97		315
98	=item ifname = devname
99
100	Sets the tun interface name to the given name. The default is OS-specific
101	and most probably something like C<tun0>.
102
103	=item rekey = seconds
104
105	Sets the rekeying interval in seconds (default: C<3600>). Connections are
106	reestablished every C<rekey> seconds.
107
108	=item keepalive = seconds
109
110	Sets the keepalive probe interval in seconds (default: C<60>). After this
111	many seconds of inactivity the daemon will start to send keepalive probe
112	every 5 seconds until it receives a reply from the other end. If no reply
113	is received within 30 seconds, the peer is considered unreachable and the
114	connection is closed.
115
116	=item mtu = bytes
117
118	Sets the maximum MTU that should be used on outgoing packets (basically
119	the MTU of the outgoing interface) The daemon will automatically calculate
120	maximum overhead (e.g. udp header size, encryption blocksize...) and pass
121	this information to the C<if-up> script.
122
123	Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).
124
125	This value must be the minimum of the mtu values of all hosts.
126
127	=item ip-proto = numerical-ip-protocol	316	=item ip-proto = numerical-ip-protocol
128		317
129	Sets the protocol number to be used for the rawip protocol. This is a	318	Sets the protocol number to be used for the rawip protocol. This is a
130	global option because all hosts must use the same protocol, and since	319	global option because all nodes must use the same protocol, and since
131	there are no port numbers, you cannot easily run more than one gvpe	320	there are no port numbers, you cannot easily run more than one gvpe
132	instance using the same protocol, nor can you share the protocol with	321	instance using the same protocol, nor can you share the protocol with
133	other programs.	322	other programs.
134		323
135	The default is 47 (GRE), which has a good chance of tunneling through	324	The default is 47 (GRE), which has a good chance of tunneling
136	firewalls (but note that the rawip protocol is not GRE compatible). Other	325	through firewalls (but note that gvpe's rawip protocol is not GRE
137	common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 (IPIP tunnels) or 98	326	compatible). Other common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4
138	(ENCAP, rfc1241)	327	(IPIP tunnels) or 98 (ENCAP, rfc1241).
139		328
		329	Many versions of Linux seem to have a bug that causes them to reorder
		330	packets for some ip protocols (GRE, ESP) but not for others (AH), so
		331	choose wisely (that is, use 51, AH).
		332
		333	=item http-proxy-host = hostname/ip
		334
		335	The C<http-proxy-*> family of options are only available if gvpe was
		336	compiled with the C<--enable-http-proxy> option and enable tunneling of
		337	tcp connections through a http proxy server.
		338
		339	C<http-proxy-host> and C<http-proxy-port> should specify the hostname and
		340	port number of the proxy server. See C<http-proxy-loginpw> if your proxy
		341	requires authentication.
		342
		343	Please note that gvpe will still try to resolve all hostnames in the
		344	configuration file, so if you are behind a proxy without access to a DNS
		345	server better use numerical IP addresses.
		346
		347	To make best use of this option disable all protocols except TCP in your
		348	config file and make sure your routers (or all other nodes) are listening
		349	on a port that the proxy allows (443, https, is a common choice).
		350
		351	If you have a router, connecting to it will suffice. Otherwise TCP must be
		352	enabled on all nodes.
		353
		354	Example:
		355
		356	http-proxy-host = proxy.example.com
		357	http-proxy-port = 3128 # 8080 is another common choice
		358	http-proxy-auth = schmorp:grumbeere
		359
		360	=item http-proxy-port = proxy-tcp-port
		361
		362	The port where your proxy server listens.
		363
		364	=item http-proxy-auth = login:password
		365
		366	The optional login and password used to authenticate to the proxy server,
		367	separated by a literal colon (C<:>). Only basic authentication is
		368	currently supported.
		369
		370	=item keepalive = seconds
		371
		372	Sets the keepalive probe interval in seconds (default: C<60>). After this
		373	many seconds of inactivity the daemon will start to send keepalive probe
		374	every 3 seconds until it receives a reply from the other end. If no reply
		375	is received within 15 seconds, the peer is considered unreachable and the
		376	connection is closed.
		377
		378	=item loglevel = noise\|trace\|debug\|info\|notice\|warn\|error\|critical
		379
		380	Set the logging level. Connection established messages are logged at level
		381	C<info>, notable errors are logged with C<error>. Default is C<info>.
		382
		383	=item mtu = bytes
		384
		385	Sets the maximum MTU that should be used on outgoing packets (basically
		386	the MTU of the outgoing interface) The daemon will automatically calculate
		387	maximum overhead (e.g. UDP header size, encryption blocksize...) and pass
		388	this information to the C<if-up> script.
		389
		390	Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).
		391
		392	This value must be the minimum of the MTU values of all nodes.
		393
		394	=item nfmark = integer
		395
		396	This advanced option, when set to a nonzero value (default: C<0>), tries
		397	to set the netfilter mark (or fwmark) value on all sockets gvpe uses to
		398	send packets.
		399
		400	This can be used to make gvpe use a different set of routing rules. For
		401	example, on GNU/Linux, the C<if-up> could set C<nfmark> to 1000 and then
		402	put all routing rules into table C<99> and then use an ip rule to make
		403	gvpe traffic avoid that routing table, in effect routing normal traffic
		404	via gvpe and gvpe traffic via the normal system routing tables:
		405
		406	ip rule add not fwmark 1000 lookup 99
		407
140	=item if-up = relative-or-absolute-path	408	=item node-up = relative-or-absolute-path
141		409
142	Sets the path of a script that should be called immediately after the	410	Sets a command (default: none) that should be called whenever a connection
143	network interface is initialized (but not neccessarily up). The following	411	is established (even on rekeying operations). Note that node-up/down
		412	scripts will be run asynchronously, but execution is serialised, so there
		413	will only ever be one such script running.
		414
		415	In addition to all the variables passed to C<if-up> scripts, the following
144	environment variables are passed to it (the values are just examples):	416	environment variables will be set (values are just examples):
145		417
146	=over 4	418	=over 4
147		419
148	=item CONFBASE=/etc/gvpe
149
150	The configuration base directory.
151
152	=item IFNAME=vpn0
153
154	The interface to initialize.
155
156	=item MTU=1436
157
158	The MTU to set the interface to. You can use lower values (if done
159	consistently on all hosts), but this is usually ineffective.
160
161	=item MAC=fe:fd:80:00:00:01
162
163	The MAC address to set the interface to. The script must set the
164	interface MAC to this value. You will most likely use one of these:
165
166	ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux
167	ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD
168
169	Please see the C<gvpe.osdep(5)> manpage for platform-specific information.
170
171	=item IFTYPE=native # or tincd
172
173	=item IFSUBTYPE=linux # or freebsd, darwin etc..
174
175	The interface type (C<native> or C<tincd>) and the subtype (usually the os
176	name in lowercase) that this gvpe was configured for. Can be used to select
177	the correct syntax to use for network-related commands.
178
179	=item NODENAME=branch1	420	=item DESTNODE=branch2
180		421
181	The nickname of the current node, as passed to the gvpe daemon.	422	The name of the remote node.
182		423
183	=item NODEID=1	424	=item DESTID=2
184		425
185	The numerical node id of the current node. The first node mentioned in the	426	The node id of the remote node.
186	config file gets ID 1, the second ID 2 and so on.	427
		428	=item DESTSI=rawip/88.99.77.55:0
		429
		430	The "socket info" of the target node, protocol dependent but usually in
		431	the format protocol/ip:port.
		432
		433	=item DESTIP=188.13.66.8
		434
		435	The numerical IP address of the remote node (gvpe accepts connections from
		436	everywhere, as long as the other node can authenticate itself).
		437
		438	=item DESTPORT=655 # deprecated
		439
		440	The protocol port used by the other side, if applicable.
		441
		442	=item STATE=up
		443
		444	Node-up scripts get called with STATE=up, node-change scripts get called
		445	with STATE=change and node-down scripts get called with STATE=down.
187		446
188	=back	447	=back
189		448
190	Here is a simple if-up script:
191
192	#!/bin/sh
193	ip link set $IFNAME address $MAC mtu $MTU up
194	[ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
195	[ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
196	ip route add 10.0.0.0/8 dev $IFNAME
197
198	More complicated examples (using routing to reduce arp traffic) can be
199	found in the etc/ subdirectory of the distribution.
200
201	=item node-up = relative-or-absolute-path
202
203	Sets a command (default: no script) that should be called whenever a
204	connection is established (even on rekeying operations). In addition
205	to the variables passed to C<if-up> scripts, the following environment
206	variables will be set:
207
208	=over 4
209
210	=item DESTNODE=branch2
211
212	The name of the remote node.
213
214	=item DESTID=2
215
216	The node id of the remote node.
217
218	=item DESTIP=188.13.66.8
219
220	The numerical IP address of the remote host (gvpe accepts connections from
221	everywhere, as long as the other host can authenticate itself).
222
223	=item DESTPORT=655 # deprecated
224
225	The UDP port used by the other side.
226
227	=item STATE=UP
228
229	Node-up scripts get called with STATE=UP, node-down scripts get called
230	with STATE=DOWN.
231
232	=back
233
234	Here is a nontrivial example that uses nsupdate to update the name => ip	449	Here is a nontrivial example that uses nsupdate to update the name => ip
235	mapping in some dns zone:	450	mapping in some DNS zone:
236		451
237	#!/bin/sh	452	#!/bin/sh
238	{	453	{
239	echo update delete $DESTNODE.lowttl.example.net. a	454	echo update delete $DESTNODE.lowttl.example.net. a
240	echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP	455	echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP
241	echo	456	echo
242	} \| nsupdate -d -k $CONFBASE:key.example.net.	457	} \| nsupdate -d -k $CONFBASE:key.example.net.
243		458
		459	=item node-change = relative-or-absolute-path
		460
		461	Same as C<node-change>, but gets called whenever something about a
		462	connection changes (such as the source IP address).
		463
244	=item node-down = relative-or-absolute-path	464	=item node-down = relative-or-absolute-path
245		465
246	Same as C<node-up>, but gets called whenever a connection is lost.	466	Same as C<node-up>, but gets called whenever a connection is lost.
247		467
248	=item http-proxy-host = hostname/ip
249
250	The C<http-proxy-*> family of options are only available if gvpe was
251	compiled with the C<--enable-http-proxy> option and enable tunneling of
252	tcp connections through a http proxy server.
253
254	C<http-proxy-host> and C<http-proxy-port> should specify the hostname and
255	port number of the proxy server. See C<http-proxy-loginpw> if your proxy
256	requires authentication.
257
258	Please note that gvpe will still try to resolve all hostnames in the
259	configuration file, so if you are behind a proxy without access to a dns
260	server better use numerical IP addresses.
261
262	To make best use of this option disable all protocols except tcp in your
263	config file and make sure your routers (or all other hosts) are listening
264	on a port that the proxy allows (443, https, is a common choice).
265
266	If you have a router, connecting to it will suffice. Otherwise tcp must be
267	enabled on all hosts.
268
269	Example:
270
271	http-proxy-host = proxy.example.com
272	http-proxy-port = 3128 # 8080 is another common choice
273	http-proxy-auth = schmorp:grumbeere
274
275	=item http-proxy-port = proxy-tcp-port
276
277	The port where your proxy server listens.
278
279	=item http-proxy-auth = login:password
280
281	The optional login and password used to authenticate to the proxy server,
282	seperated by a literal colon (C<:>). Only basic authentication is
283	currently supported.
284
285	=item pid-file = path	468	=item pid-file = path
286		469
287	The path to the pid file to check and create (Default:	470	The path to the pid file to check and create
		471	(default: C<LOCALSTATEDIR/run/gvpe.pid>). The first C<%s> is replaced by
		472	the nodename - any other use of C<%> must be written as C<%%>.
		473
		474	=item private-key = relative-path-to-key
		475
		476	Sets the path (relative to the config directory) to the private key
		477	(default: C<hostkey>). This is a printf format string so every C<%> must
		478	be doubled. A single C<%s> is replaced by the hostname, so you could
		479	use paths like C<hostkeys/%s> to fetch the files at the location where
		480	C<gvpectrl> puts them.
		481
		482	Since only the private key file of the current node is used and the
		483	private key file should be kept secret per-node to avoid spoofing, it is
		484	not recommended to use this feature.
		485
		486	=item rekey = seconds
		487
		488	Sets the rekeying interval in seconds (default: C<3607>). Connections are
		489	reestablished every C<rekey> seconds, making them use a new encryption
		490	key.
		491
		492	=item seed-device = path
		493
		494	The random device used to initially and regularly seed the random
		495	number generator (default: F</dev/urandom>). Randomness is of paramount
		496	importance to the security of the algorithms used in gvpe.
		497
		498	On program start and every seed-interval, gvpe will read 64 octets.
		499
		500	Setting this path to the empty string will disable this functionality
		501	completely (the underlying crypto library will likely look for entropy
		502	sources on it's own though, so not all is lost).
		503
		504	=item seed-interval = seconds
		505
		506	The number of seconds between reseeds of the random number generator
		507	(default: C<3613>). A value of C<0> disables this regular reseeding.
		508
		509	=item serial = string
		510
		511	The configuration serial number. This can be any string up to 16 bytes
		512	length. Only when the serial matches on both sides of a conenction will
		513	the connection succeed. This is I<not> a security mechanism and eay to
		514	spoof, this mechanism exists to alert users that their config is outdated.
		515
		516	It's recommended to specify this is a date string such as C<2013-05-05> or
		517	C<20121205084417>.
		518
		519	The exact algorithm is as this: if a connection request is received form a
		520	node with an identical serial, then it succeeds normally.
		521
		522	If the remote serial is lower than the local serial, it is ignored.
		523
		524	If the remote serial is higher than the local serial, a warning message is
		525	logged.
288		526
289	=back	527	=back
290		528
291	=head2 NODE SPECIFIC SETTINGS	529	=head2 NODE SPECIFIC SETTINGS
292		530
293	The following settings are node-specific, that is, every node can have	531	The following settings are node-specific, that is, every node can have
294	different settings, even within the same gvpe instance. Settings that are	532	different settings, even within the same gvpe instance. Settings that are
295	executed before the first node section set the defaults, settings that are	533	set before the first node section set the defaults, settings that are
296	executed within a node section only apply to the given node.	534	set within a node section only apply to the given node.
297		535
298	=over 4	536	=over 4
299		537
		538	=item allow-direct = nodename
		539
		540	Allow direct connections to this node. See C<deny-direct> for more info.
		541
		542	=item compress = yes\|true\|on \| no\|false\|off
		543
		544	For the current node, this specified whether it will accept compressed
		545	packets, and for all other nodes, this specifies whether to try to
		546	compress data packets sent to this node (default: C<yes>). Compression is
		547	really cheap even on slow computers, has no size overhead at all and will
		548	only be used when the other side supports compression, so enabling this is
		549	often a good idea.
		550
		551	=item connect = ondemand \| never \| always \| disabled
		552
		553	Sets the connect mode (default: C<always>). It can be C<always> (always
		554	try to establish and keep a connection to the given node), C<never>
		555	(never initiate a connection to the given host, but accept connections),
		556	C<ondemand> (try to establish a connection when there are outstanding
		557	packets in the queue and take it down after the keepalive interval) or
		558	C<disabled> (node is bad, don't talk to it).
		559
		560	Routers will automatically be forced to C<always> unless they are
		561	C<disabled>, to ensure all nodes can talk to each other.
		562
		563	=item deny-direct = nodename \| *
		564
		565	Deny direct connections to the specified node (or all nodes when C<*>
		566	is given). Only one node can be specified, but you can use multiple
		567	C<allow-direct> and C<deny-direct> statements. This only makes sense in
		568	networks with routers, as routers are required for indirect connections.
		569
		570	Sometimes, a node cannot reach some other nodes for reasons of network
		571	connectivity. For example, a node behind a firewall that only allows
		572	connections to/from a single other node in the network. In this case one
		573	should specify C<deny-direct = *> and C<allow-direct = othernodename> (the other
		574	node I<must> be a router for this to work).
		575
		576	The algorithm to check whether a connection may be direct is as follows:
		577
		578	1. Other node mentioned in an C<allow-direct>? If yes, allow the connection.
		579
		580	2. Other node mentioned in a C<deny-direct>? If yes, deny direct connections.
		581
		582	3. Allow the connection.
		583
		584	That is, C<allow-direct> takes precedence over C<deny-direct>.
		585
		586	The check is done in both directions, i.e. both nodes must allow a direct
		587	connection before one is attempted, so you only need to specify connect
		588	limitations on one node.
		589
		590	=item dns-domain = domain-suffix
		591
		592	The DNS domain suffix that points to the DNS tunnel server for this node.
		593
		594	The domain must point to a NS record that points to the I<dns-hostname>,
		595	i.e.
		596
		597	dns-domainname = tunnel.example.net
		598	dns-hostname = tunnel-server.example.net
		599
		600	Corresponds to the following DNS entries in the C<example.net> domain:
		601
		602	tunnel.example.net. NS tunnel-server.example.net.
		603	tunnel-server.example.net. A 13.13.13.13
		604
		605	=item dns-hostname = hostname/ip
		606
		607	The address to bind the DNS tunnel socket to, similar to the C<hostname>,
		608	but for the DNS tunnel protocol only. Default: C<0.0.0.0>, but that might
		609	change.
		610
300	=item udp-port = port-number	611	=item dns-port = port-number
301		612
302	Sets the port number used by the UDP protocol (default: C<655>, not	613	The port to bind the DNS tunnel socket to. Must be C<53> on DNS tunnel servers.
303	officially assigned by IANA!).
304		614
305	=item tcp-port = port-number	615	=item enable-dns = yes\|true\|on \| no\|false\|off
306		616
307	Similar to C<udp-port> (default: C<655>), but sets the TCP port number.	617	See gvpe.protocol(7) for a description of the DNS transport
		618	protocol. Avoid this protocol if you can.
		619
		620	Enable the DNS tunneling protocol on this node, either as server or as
		621	client. Support for this transport protocol is only available when gvpe
		622	was compiled using the C<--enable-dns> option.
		623
		624	=item enable-icmp = yes\|true\|on \| no\|false\|off
		625
		626	See gvpe.protocol(7) for a description of the ICMP transport protocol.
		627
		628	Enable the ICMP transport using ICMP packets of type C<icmp-type> on this
		629	node.
308		630
309	=item enable-rawip = yes\|true\|on \| no\|false\|off	631	=item enable-rawip = yes\|true\|on \| no\|false\|off
310		632
		633	See gvpe.protocol(7) for a description of the RAW IP transport protocol.
		634
311	Enable the RAW IPv4 transport using the C<ip-proto> protocol	635	Enable the RAW IPv4 transport using the C<ip-proto> protocol
312	(default: C<no>). This is the best choice, since the overhead per packet	636	(default: C<no>).
313	is only 38 bytes, as opposed to UDP's 58 (or TCP's 60+).	637
		638	=item enable-tcp = yes\|true\|on \| no\|false\|off
		639
		640	See gvpe.protocol(7) for a description of the TCP transport protocol.
		641
		642	Enable the TCPv4 transport using the C<tcp-port> port
		643	(default: C<no>). Support for this transport protocol is only available
		644	when gvpe was compiled using the C<--enable-tcp> option.
314		645
315	=item enable-udp = yes\|true\|on \| no\|false\|off	646	=item enable-udp = yes\|true\|on \| no\|false\|off
316		647
		648	See gvpe.protocol(7) for a description of the UDP transport protocol.
		649
317	Enable the UDPv4 transport using the C<udp-port> port (default: C<yes>,	650	Enable the UDPv4 transport using the C<udp-port> port (default: C<no>).
318	but this will change!). This is a good general choice since UDP tunnels
319	well through many firewalls.
320		651
321	NOTE: Please specify C<enable-udp = yes> even though it is the default, as	652	=item hostname = hostname \| ip [can not be defaulted]
322	some future version will have all protocols disabled by default.
323		653
324	=item enable-tcp = yes\|true\|on \| no\|false\|off	654	Forces the address of this node to be set to the given DNS hostname or IP
		655	address. It will be resolved before each connect request, so dyndns should
		656	work fine. If this setting is not specified and a router is available,
		657	then the router will be queried for the address of this node. Otherwise,
		658	the connection attempt will fail.
325		659
326	Enable the TCPv4 transport using the C<tcp-port> port	660	Note that DNS resolving is done synchronously, pausing the daemon. If that
327	(default: C<no>). Support for this horribly unsuitable protocol is only	661	is an issue you need to specify IP addresses.
328	available when gvpe was compiled using the C<--enable-tcp> option. Never
329	use this transport unless you really must, it is horribly ineffiecent and
330	resource-intensive compared to the other transports.
331		662
332	=item router-priority = 0 \| 1 \| positive-number>2	663	=item icmp-type = integer
333		664
334	Sets the router priority of the given host (default: C<0>, disabled). If	665	Sets the type value to be used for outgoing (and incoming) packets sent
335	some host tries to connect to another host without a hostname, it asks	666	via the ICMP transport.
336	the router host for it's IP address. The router host is the one with the
337	highest priority larger than C<1> that is currently reachable.
338		667
339	Make sure all hosts always connect (C<connect = always>) to the router	668	The default is C<0> (which is C<echo-reply>, also known as
340	hosts, otherwise connecting to them might be impossible.	669	"ping-reply"). Other useful values include C<8> (C<echo-request>, a.k.a.
		670	"ping") and C<11> (C<time-exceeded>), but any 8-bit value can be used.
341		671
342	The special value C<1> allows other hosts to route through the router	672	=item if-up-data = value
343	host, but they will never route through it by default. The value C<0>
344	disables routing. The idea behind this is that some hosts can, if
345	required, bump the C<router-priority> setting to higher than C<1> in their
346	local config to route through specific hosts. If C<router-priority> is
347	C<0>, then routing will be refused, so C<1> serves as a "enable, but do
348	not use by default" switch.
349		673
350	=item connect = ondemand \| never \| always \| disabled	674	The value specified using this directive will be passed to the C<if-up>
351		675	script in the environment variable C<IFUPDATA>.
352	Sets the connect mode (default: C<always>). It can be C<always> (always
353	try to establish and keep a connection to the given host), C<never>
354	(never initiate a connection to the given host, but accept connections),
355	C<ondemand> (try to establish a connection on the first packet sent, and
356	take it down after the keepalive interval) or C<disabled> (node is bad,
357	don't talk to it).
358		676
359	=item inherit-tos = yes\|true\|on \| no\|false\|off	677	=item inherit-tos = yes\|true\|on \| no\|false\|off
360		678
361	Wether to inherit the TOS settings of packets sent to the tunnel when	679	Whether to inherit the TOS settings of packets sent to the tunnel when
362	sending packets to this node (default: C<yes>). If set to C<yes> then	680	sending packets to this node (default: C<yes>). If set to C<yes> then
363	outgoing tunnel packets will have the same TOS setting as the packets sent	681	outgoing tunnel packets will have the same TOS setting as the packets sent
364	to the tunnel device, which is usually what you want.	682	to the tunnel device, which is usually what you want.
365		683
366	=item compress = yes\|true\|on \| no\|false\|off	684	=item low-power = yes\|true\|on \| no\|false\|off
367		685
368	Wether to compress data packets sent to this host (default: C<yes>).	686	If true, designates a node as a low-power node. Low-power nodes use
369	Compression is really cheap even on slow computers and has no size	687	larger timeouts and try to reduce cpu time. Other nodes talking to a
370	overhead at all, so enabling this is a good idea.	688	low-power node will also use larger timeouts, and will use less aggressive
		689	optimisations, in the hope of reducing load. Security is not compromised.
		690
		691	The typical low-power node would be a mobile phone, where wakeups and
		692	encryption can significantly increase power drain.
371		693
372	=item max-retry = positive-number	694	=item max-retry = positive-number
373		695
374	The maximum interval in seconds (default: C<28800>, 8 hours) between	696	The maximum interval in seconds (default: C<3600>, one hour) between
375	retries to establish a connection to this node. When a connection cannot	697	retries to establish a connection to this node. When a connection cannot
376	be established, gvpe uses exponential backoff capped at this value. It's	698	be established, gvpe uses exponential back-off capped at this value. It's
377	sometimes useful to set this to a much lower value (e.g. C<120>) on	699	sometimes useful to set this to a much lower value (e.g. C<120>) on
378	connections to routers that usually are stable but sometimes are down, to	700	connections to routers that usually are stable but sometimes are down, to
379	assure quick reconnections.	701	assure quick reconnections even after longer downtimes.
		702
		703	=item max-ttl = seconds
		704
		705	Expire packets that couldn't be sent after this many seconds
		706	(default: C<60>). Gvpe will normally queue packets for a node without an
		707	active connection, in the hope of establishing a connection soon. This
		708	value specifies the maximum lifetime a packet will stay in the queue, if a
		709	packet gets older, it will be thrown away.
		710
		711	=item max-queue = positive-number>=1
		712
		713	The maximum number of packets that will be queued (default: C<512>)
		714	for this node. If more packets are sent then earlier packets will be
		715	expired. See C<max-ttl>, above.
		716
		717	=item router-priority = 0 \| 1 \| positive-number>=2
		718
		719	Sets the router priority of the given node (default: C<0>, disabled).
		720
		721	If some node tries to connect to another node but it doesn't have a
		722	hostname, it asks a router node for it's IP address. The router node
		723	chosen is the one with the highest priority larger than C<1> that is
		724	currently reachable. This is called a I<mediated> connection, as the
		725	connection itself will still be direct, but it uses another node to
		726	mediate between the two nodes.
		727
		728	The value C<0> disables routing, that means if the node receives a packet
		729	not for itself it will not forward it but instead drop it.
		730
		731	The special value C<1> allows other hosts to route through the router
		732	host, but they will never route through it by default (i.e. the config
		733	file of another node needs to specify a router priority higher than one
		734	to choose such a node for routing).
		735
		736	The idea behind this is that some hosts can, if required, bump the
		737	C<router-priority> setting to higher than C<1> in their local config to
		738	route through specific hosts. If C<router-priority> is C<0>, then routing
		739	will be refused, so C<1> serves as a "enable, but do not use by default"
		740	switch.
		741
		742	Nodes with C<router-priority> set to C<2> or higher will always be forced
		743	to C<connect> = C<always> (unless they are C<disabled>).
		744
		745	=item tcp-port = port-number
		746
		747	Similar to C<udp-port> (default: C<655>), but sets the TCP port number.
		748
		749	=item udp-port = port-number
		750
		751	Sets the port number used by the UDP protocol (default: C<655>, not
		752	officially assigned by IANA!).
380		753
381	=back	754	=back
382		755
383	=head1 CONFIG DIRECTORY LAYOUT	756	=head1 CONFIG DIRECTORY LAYOUT
384		757
385	The default (or recommended) directory layout for the config directory is:	758	The default (or recommended) directory layout for the config directory is:
386		759
387	=over 4	760	=over 4
388		761
389	=item X<gvpe.conf>	762	=item gvpe.conf
390		763
391	The config file.	764	The config file.
392		765
393	=item X<if-up>	766	=item if-up
394		767
395	The if-up script	768	The if-up script
396		769
397	=item X<node-up>, X<node-down>	770	=item node-up, node-down
398		771
399	If used the node up or node-down scripts.	772	If used the node up or node-down scripts.
400		773
401	=item X<hostkey>	774	=item hostkey
402		775
403	The private key (taken from C<hostkeys/nodename>) of the current host.	776	The (default path of the) private key of the current host.
404		777
405	=item X<pubkey/nodename>	778	=item pubkey/nodename
406		779
407	The public keys of the other nodes, one file per node.	780	The public keys of the other nodes, one file per node.
408		781
409	=back	782	=back
410		783
…		…
412		785
413	gvpe(5), gvpe(8), gvpectrl(8).	786	gvpe(5), gvpe(8), gvpectrl(8).
414		787
415	=head1 AUTHOR	788	=head1 AUTHOR
416		789
417	Marc Lehmann <gvpe@plan9.de>	790	Marc Lehmann <gvpe@schmorp.de>
418		791

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