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

Comparing gvpe/doc/gvpe.conf.5.pod (file contents):
Revision 1.1 by pcg, Fri Jun 11 15:56:13 2004 UTC vs.
Revision 1.7 by pcg, Sun Mar 6 22:45:29 2005 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
8	udp-port = 407	7	udp-port = 407
9	mtu = 1492	8	mtu = 1492
10	ifname = vpn0	9	ifname = vpn0
11		10
12	node = branch1	11	node = branch1
…		…
61	values on different nodes using C<on>), but will affect the behaviour of	60	values on different nodes using C<on>), but will affect the behaviour of
62	the gvpe daemon and all connections it creates.	61	the gvpe daemon and all connections it creates.
63		62
64	=over 4	63	=over 4
65		64
66	=item loglevel = noise\|trace\|debug\|info\|notice\|warn\|error\|critical	65	=item dns-forw-host = hostname/ip
67		66
68	Set the logging level. Connection established messages are logged at level	67	The dns server to forward dns requests to for the DNS tunnel protocol
69	C<info>, notable errors are logged with C<error>. Default is C<info>.	68	(default: C<127.0.0.1>, changing it is highly recommended).
70		69
71	=item node = nickname	70	=item dns-forw-port = port-number
72		71
73	Not really a config setting but introduces a node section. The nickname is	72	The port where the C<dns-forw-host> is to be contacted (default: C<53>,
74	used to select the right configuration section and must be passed as an	73	which is fine in most cases).
75	argument to the gvpe daemon.
76		74
77	=item private-key = relative-path-to-key	75	=item if-up = relative-or-absolute-path
78		76
79	Sets the path (relative to the config directory) to the private key	77	Sets the path of a script that should be called immediately after the
80	(default: C<hostkey>). This is a printf format string so every C<%> must	78	network interface is initialized (but not neccessarily up). The following
81	be doubled. A single C<%s> is replaced by the hostname, so you could	79	environment variables are passed to it (the values are just examples):
82	use paths like C<hostkeys/%s> to fetch the files at the location where
83	C<gvpectrl> puts them.
84		80
85	Since only the private key file of the current node is used and the	81	=over 4
86	private key file should be kept secret per-host to avoid spoofings, it is	82
87	not recommended to use this feature.	83	=item CONFBASE=/etc/gvpe
		84
		85	The configuration base directory.
		86
		87	=item IFNAME=vpn0
		88
		89	The interface to initialize.
		90
		91	=item MTU=1436
		92
		93	The MTU to set the interface to. You can use lower values (if done
		94	consistently on all hosts), but this is usually ineffective.
		95
		96	=item MAC=fe:fd:80:00:00:01
		97
		98	The MAC address to set the interface to. The script must set the
		99	interface MAC to this value. You will most likely use one of these:
		100
		101	ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux
		102	ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD
		103
		104	Please see the C<gvpe.osdep(5)> manpage for platform-specific information.
		105
		106	=item IFTYPE=native # or tincd
		107
		108	=item IFSUBTYPE=linux # or freebsd, darwin etc..
		109
		110	The interface type (C<native> or C<tincd>) and the subtype (usually the os
		111	name in lowercase) that this gvpe was configured for. Can be used to select
		112	the correct syntax to use for network-related commands.
		113
		114	=item NODENAME=branch1
		115
		116	The nickname of the current node, as passed to the gvpe daemon.
		117
		118	=item NODEID=1
		119
		120	The numerical node id of the current node. The first node mentioned in the
		121	config file gets ID 1, the second ID 2 and so on.
		122
		123	=back
		124
		125	Here is a simple if-up script:
		126
		127	#!/bin/sh
		128	ip link set $IFNAME address $MAC mtu $MTU up
		129	[ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME
		130	[ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME
		131	ip route add 10.0.0.0/8 dev $IFNAME
		132
		133	More complicated examples (using routing to reduce arp traffic) can be
		134	found in the etc/ subdirectory of the distribution.
		135
		136	=item ifname = devname
		137
		138	Sets the tun interface name to the given name. The default is OS-specific
		139	and most probably something like C<tun0>.
88		140
89	=item ifpersist = yes\|true\|on \| no\|false\|off	141	=item ifpersist = yes\|true\|on \| no\|false\|off
90		142
91	Should the tun/tap device be made persistent, that is, should the device	143	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	144	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	145	problems sending packets when gvpe is restarted in persistent mode, so
94	if the connections can be established but you cannot send packets from	146	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	147	the local node, try to set this to C<off> and do an ifconfig down on the
96	device.	148	device.
97		149
98	=item ifname = devname	150	=item ip-proto = numerical-ip-protocol
99		151
100	Sets the tun interface name to the given name. The default is OS-specific	152	Sets the protocol number to be used for the rawip protocol. This is a
101	and most probably something like C<tun0>.	153	global option because all hosts must use the same protocol, and since
		154	there are no port numbers, you cannot easily run more than one gvpe
		155	instance using the same protocol, nor can you share the protocol with
		156	other programs.
102		157
103	=item rekey = seconds	158	The default is 47 (GRE), which has a good chance of tunneling through
		159	firewalls (but note that the rawip protocol is not GRE compatible). Other
		160	common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 (IPIP tunnels) or 98
		161	(ENCAP, rfc1241)
104		162
105	Sets the rekeying interval in seconds (default: C<3600>). Connections are	163	=item http-proxy-host = hostname/ip
106	reestablished every C<rekey> seconds.	164
		165	The C<http-proxy-*> family of options are only available if gvpe was
		166	compiled with the C<--enable-http-proxy> option and enable tunneling of
		167	tcp connections through a http proxy server.
		168
		169	C<http-proxy-host> and C<http-proxy-port> should specify the hostname and
		170	port number of the proxy server. See C<http-proxy-loginpw> if your proxy
		171	requires authentication.
		172
		173	Please note that gvpe will still try to resolve all hostnames in the
		174	configuration file, so if you are behind a proxy without access to a dns
		175	server better use numerical IP addresses.
		176
		177	To make best use of this option disable all protocols except tcp in your
		178	config file and make sure your routers (or all other hosts) are listening
		179	on a port that the proxy allows (443, https, is a common choice).
		180
		181	If you have a router, connecting to it will suffice. Otherwise tcp must be
		182	enabled on all hosts.
		183
		184	Example:
		185
		186	http-proxy-host = proxy.example.com
		187	http-proxy-port = 3128 # 8080 is another common choice
		188	http-proxy-auth = schmorp:grumbeere
		189
		190	=item http-proxy-port = proxy-tcp-port
		191
		192	The port where your proxy server listens.
		193
		194	=item http-proxy-auth = login:password
		195
		196	The optional login and password used to authenticate to the proxy server,
		197	seperated by a literal colon (C<:>). Only basic authentication is
		198	currently supported.
107		199
108	=item keepalive = seconds	200	=item keepalive = seconds
109		201
110	Sets the keepalive probe interval in seconds (default: C<60>). After this	202	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	203	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	204	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	205	is received within 30 seconds, the peer is considered unreachable and the
114	connection is closed.	206	connection is closed.
115		207
		208	=item loglevel = noise\|trace\|debug\|info\|notice\|warn\|error\|critical
		209
		210	Set the logging level. Connection established messages are logged at level
		211	C<info>, notable errors are logged with C<error>. Default is C<info>.
		212
116	=item mtu = bytes	213	=item mtu = bytes
117		214
118	Sets the maximum MTU that should be used on outgoing packets (basically	215	Sets the maximum MTU that should be used on outgoing packets (basically
119	the MTU of the outgoing interface) The daemon will automatically calculate	216	the MTU of the outgoing interface) The daemon will automatically calculate
120	maximum overhead (e.g. udp header size, encryption blocksize...) and pass	217	maximum overhead (e.g. udp header size, encryption blocksize...) and pass
…		…
122		219
123	Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).	220	Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp).
124		221
125	This value must be the minimum of the mtu values of all hosts.	222	This value must be the minimum of the mtu values of all hosts.
126		223
127	=item ip-proto = numerical-ip-protocol	224	=item node = nickname
128		225
129	Sets the protocol number to be used for the rawip protocol. This is a	226	Not really a config setting but introduces a node section. The nickname is
130	global option because all hosts must use the same protocol, and since	227	used to select the right configuration section and must be passed as an
131	there are no port numbers, you cannot easily run more than one gvpe	228	argument to the gvpe daemon.
132	instance using the same protocol, nor can you share the protocol with
133	other programs.
134
135	The default is 47 (GRE), which has a good chance of tunneling through
136	firewalls (but note that the rawip protocol is not GRE compatible). Other
137	common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 (IPIP tunnels) or 98
138	(ENCAP, rfc1241)
139
140	=item if-up = relative-or-absolute-path
141
142	Sets the path of a script that should be called immediately after the
143	network interface is initialized (but not neccessarily up). The following
144	environment variables are passed to it (the values are just examples):
145
146	=over 4
147
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
180
181	The nickname of the current node, as passed to the gvpe daemon.
182
183	=item NODEID=1
184
185	The numerical node id of the current node. The first node mentioned in the
186	config file gets ID 1, the second ID 2 and so on.
187
188	=back
189
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		229
201	=item node-up = relative-or-absolute-path	230	=item node-up = relative-or-absolute-path
202		231
203	Sets a command (default: no script) that should be called whenever a	232	Sets a command (default: no script) that should be called whenever a
204	connection is established (even on rekeying operations). In addition	233	connection is established (even on rekeying operations). In addition
…		…
243		272
244	=item node-down = relative-or-absolute-path	273	=item node-down = relative-or-absolute-path
245		274
246	Same as C<node-up>, but gets called whenever a connection is lost.	275	Same as C<node-up>, but gets called whenever a connection is lost.
247		276
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	277	=item pid-file = path
286		278
287	The path to the pid file to check and create (Default:	279	The path to the pid file to check and create
		280	(default: C<LOCALSTATEDIR/run/gvpe.pid>).
		281
		282	=item private-key = relative-path-to-key
		283
		284	Sets the path (relative to the config directory) to the private key
		285	(default: C<hostkey>). This is a printf format string so every C<%> must
		286	be doubled. A single C<%s> is replaced by the hostname, so you could
		287	use paths like C<hostkeys/%s> to fetch the files at the location where
		288	C<gvpectrl> puts them.
		289
		290	Since only the private key file of the current node is used and the
		291	private key file should be kept secret per-host to avoid spoofings, it is
		292	not recommended to use this feature.
		293
		294	=item rekey = seconds
		295
		296	Sets the rekeying interval in seconds (default: C<3600>). Connections are
		297	reestablished every C<rekey> seconds.
288		298
289	=back	299	=back
290		300
291	=head2 NODE SPECIFIC SETTINGS	301	=head2 NODE SPECIFIC SETTINGS
292		302
…		…
295	executed before the first node section set the defaults, settings that are	305	executed before the first node section set the defaults, settings that are
296	executed within a node section only apply to the given node.	306	executed within a node section only apply to the given node.
297		307
298	=over 4	308	=over 4
299		309
		310	=item compress = yes\|true\|on \| no\|false\|off
		311
		312	Wether to compress data packets sent to this host (default: C<yes>).
		313	Compression is really cheap even on slow computers and has no size
		314	overhead at all, so enabling this is a good idea.
		315
		316	=item connect = ondemand \| never \| always \| disabled
		317
		318	Sets the connect mode (default: C<always>). It can be C<always> (always
		319	try to establish and keep a connection to the given host), C<never>
		320	(never initiate a connection to the given host, but accept connections),
		321	C<ondemand> (try to establish a connection on the first packet sent, and
		322	take it down after the keepalive interval) or C<disabled> (node is bad,
		323	don't talk to it).
		324
		325	=item dns-domain = domain-suffix
		326
		327	The DNS domain suffix that points to the DNS tunnel server for this node.
		328
		329	The domain must point to a NS record that points to the I<dns-hostname>,
		330	i.e.
		331
		332	dns-domainname = tunnel.example.net
		333	dns-hostname = tunnel-server.example.net
		334
		335	Corresponds to the following DNS entries in the C<example.net> domain:
		336
		337	tunnel.example.net. NS tunnel-server.example.net.
		338	tunnel-server.example.net. A 13.13.13.13
		339
		340	=item dns-hostname = hostname/ip
		341
		342	The address to bind the DNS tunnel socket to, similar to the C<hostname>,
		343	but for the DNS tunnel protocol only. Default: C<0.0.0.0>, but that might
		344	change.
		345
300	=item udp-port = port-number	346	=item dns-port = port-number
301		347
302	Sets the port number used by the UDP protocol (default: C<655>, not	348	The port to bind the DNS tunnel socket to. Must be C<0> on all DNS tunnel
303	officially assigned by IANA!).	349	clients and C<53> on the server.
304		350
305	=item tcp-port = port-number	351	=item enable-dns = yes\|true\|on \| no\|false\|off
306		352
307	Similar to C<udp-port> (default: C<655>), but sets the TCP port number.	353	Enable the DNS tunneling protocol on this node, either as server
		354	C<dns-port != 0> or as client C<dns-port == 0> (both at the same time is
		355	not possible at the moment).
308		356
309	=item enable-rawip = yes\|true\|on \| no\|false\|off	357	=item enable-rawip = yes\|true\|on \| no\|false\|off
310		358
311	Enable the RAW IPv4 transport using the C<ip-proto> protocol	359	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	360	(default: C<no>). This is the best choice, since the overhead per packet
313	is only 38 bytes, as opposed to UDP's 58 (or TCP's 60+).	361	is only 38 bytes, as opposed to UDP's 58 (or TCP's 60+).
314
315	=item enable-udp = yes\|true\|on \| no\|false\|off
316
317	Enable the UDPv4 transport using the C<udp-port> port (default: C<yes>,
318	but this will change!). This is a good general choice since UDP tunnels
319	well through many firewalls.
320
321	NOTE: Please specify C<enable-udp = yes> even though it is the default, as
322	some future version will have all protocols disabled by default.
323		362
324	=item enable-tcp = yes\|true\|on \| no\|false\|off	363	=item enable-tcp = yes\|true\|on \| no\|false\|off
325		364
326	Enable the TCPv4 transport using the C<tcp-port> port	365	Enable the TCPv4 transport using the C<tcp-port> port
327	(default: C<no>). Support for this horribly unsuitable protocol is only	366	(default: C<no>). Support for this horribly unsuitable protocol is only
328	available when gvpe was compiled using the C<--enable-tcp> option. Never	367	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	368	use this transport unless you really must, it is horribly ineffiecent and
330	resource-intensive compared to the other transports.	369	resource-intensive compared to the other transports.
331		370
332	=item router-priority = positive-number	371	=item enable-udp = yes\|true\|on \| no\|false\|off
333		372
334	Sets the router priority of the given host (default: C<0>, disabled). If	373	Enable the UDPv4 transport using the C<udp-port> port (default: C<no>,
335	some host tries to connect to another host without a hostname, it asks	374	unless no other protocol is enabled for a node, in which case this
336	the router host for it's IP address. The router host is the one with the	375	protocol is enabled automatically). This is a good general choice since
337	highest priority that is currently reachable. Make sure all clients always	376	UDP tunnels well through many firewalls.
338	connect to the router hosts, otherwise conencting to them is impossible.
339		377
340	=item connect = ondemand\|never\|always\|disabled	378	NOTE: Please specify C<enable-udp = yes> if you want t use it even though
341		379	it might get switched on automatically, as some future version might
342	Sets the connect mode (default: C<always>). It can be C<always> (always	380	default to another default protocol.
343	try to establish and keep a conenction to the given host), C<never>
344	(nevr initiate a connection to the given host, but accept connections),
345	C<ondemand> (try to establish a connection on the first packet sent, and
346	take it down after the keepalive interval) or C<disabled> (node is bad,
347	don't talk to it).
348		381
349	=item inherit-tos = yes\|true\|on \| no\|false\|off	382	=item inherit-tos = yes\|true\|on \| no\|false\|off
350		383
351	Wether to inherit the TOS settings of packets sent to the tunnel when	384	Wether to inherit the TOS settings of packets sent to the tunnel when
352	sending packets to this node (default: C<yes>). If set to C<yes> then	385	sending packets to this node (default: C<yes>). If set to C<yes> then
353	outgoing tunnel packets will have the same TOS setting as the packets sent	386	outgoing tunnel packets will have the same TOS setting as the packets sent
354	to the tunnel device, which is usually what you want.	387	to the tunnel device, which is usually what you want.
355
356	=item compress = yes\|true\|on \| no\|false\|off
357
358	Wether to compress data packets sent to this host (default: C<yes>).
359	Compression is really cheap even on slow computers and has no size
360	overhead at all, so enabling this is a good idea.
361		388
362	=item max-retry = positive-number	389	=item max-retry = positive-number
363		390
364	The maximum interval in seconds (default: C<28800>, 8 hours) between	391	The maximum interval in seconds (default: C<28800>, 8 hours) between
365	retries to establish a connection to this node. When a connection cannot	392	retries to establish a connection to this node. When a connection cannot
366	be established, gvpe uses exponential backoff capped at this value. It's	393	be established, gvpe uses exponential backoff capped at this value. It's
367	sometimes useful to set this to a much lower value (e.g. C<120>) on	394	sometimes useful to set this to a much lower value (e.g. C<120>) on
368	connections to routers that usually are stable but sometimes are down, to	395	connections to routers that usually are stable but sometimes are down, to
369	assure quick reconnections.	396	assure quick reconnections.
370		397
		398	=item router-priority = 0 \| 1 \| positive-number>2
		399
		400	Sets the router priority of the given host (default: C<0>, disabled). If
		401	some host tries to connect to another host without a hostname, it asks
		402	the router host for it's IP address. The router host is the one with the
		403	highest priority larger than C<1> that is currently reachable.
		404
		405	Make sure all hosts always connect (C<connect = always>) to the router
		406	hosts, otherwise connecting to them might be impossible.
		407
		408	The special value C<1> allows other hosts to route through the router
		409	host, but they will never route through it by default. The value C<0>
		410	disables routing. The idea behind this is that some hosts can, if
		411	required, bump the C<router-priority> setting to higher than C<1> in their
		412	local config to route through specific hosts. If C<router-priority> is
		413	C<0>, then routing will be refused, so C<1> serves as a "enable, but do
		414	not use by default" switch.
		415
		416	=item tcp-port = port-number
		417
		418	Similar to C<udp-port> (default: C<655>), but sets the TCP port number.
		419
		420	=item udp-port = port-number
		421
		422	Sets the port number used by the UDP protocol (default: C<655>, not
		423	officially assigned by IANA!).
		424
371	=back	425	=back
372		426
373	=head1 CONFIG DIRECTORY LAYOUT	427	=head1 CONFIG DIRECTORY LAYOUT
374		428
375	The default (or recommended) directory layout for the config directory is:	429	The default (or recommended) directory layout for the config directory is:
376		430
377	=over 4	431	=over 4
378		432
379	=item gvpe.conf	433	=item X<gvpe.conf>
380		434
381	The config file.	435	The config file.
382		436
383	=item if-up	437	=item X<if-up>
384		438
385	The if-up script	439	The if-up script
386		440
387	=item node-up, node-down	441	=item X<node-up>, X<node-down>
388		442
389	If used the node up or node-down scripts.	443	If used the node up or node-down scripts.
390		444
391	=item hostkey	445	=item X<hostkey>
392		446
393	The private key (taken from C<hostkeys/nodename>) of the current host.	447	The private key (taken from C<hostkeys/nodename>) of the current host.
394		448
395	=item pubkey/nodename	449	=item X<pubkey/nodename>
396		450
397	The public keys of the other nodes, one file per node.	451	The public keys of the other nodes, one file per node.
398		452
399	=back	453	=back
400		454

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Comparing gvpe/doc/gvpe.conf.5.pod (file contents): Revision 1.1 by pcg, Fri Jun 11 15:56:13 2004 UTC vs. Revision 1.7 by pcg, Sun Mar 6 22:45:29 2005 UTC

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Comparing gvpe/doc/gvpe.conf.5.pod (file contents):
Revision 1.1 by pcg, Fri Jun 11 15:56:13 2004 UTC vs.
Revision 1.7 by pcg, Sun Mar 6 22:45:29 2005 UTC