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Rev	Author	Line No.	Line
2	-	1	`.TH 6IN4 8`
		2	`.SH NAME`
		3	`6in4 - 6to4 tunnel of IPv6 through IPv4`
		4	`.SH SYNOPSIS`
		5	`.B ip/6in4`
		6	`[`
		7	`.B -ag`
		8	`] [`
		9	`.B -x`
		10	`.I netmtpt`
		11	`] [`
		12	`.IB local6[ / mask]`
		13	`[`
		14	`.I remote4`
		15	`[`
		16	`.I remote6`
		17	`] ] ]`
		18	`.SH DESCRIPTION`
		19	`.I 6in4`
		20	`sets up and operates a tunnel of IPv6 traffic through an IPv4 connection.`
		21	`.PP`
		22	`.I Local6`
		23	`and`
		24	`.I mask`
		25	`define the IPv6 address and subnet of the near end of the tunnel`
		26	`.RI ( mask`
		27	`defaults to`
		28	`.L /128`
		29	`for a single-host`
		30	`tunnel).`
		31	`If`
		32	`.I local6`
		33	`is missing or`
		34	`.LR - ,`
		35	`it defaults to`
		36	`.IP`
		37	`.BI 2002: aabb : ccdd ::1/48`
		38	`.PP`
		39	`where`
		40	`.IR aa ,`
		41	`.IR bb ,`
		42	`.I cc`
		43	`and`
		44	`.I dd`
		45	`are the hexadecimal equivalents of the bytes`
		46	`.IB a . b . c .\c`
		47	`.I d`
		48	`in this host's primary IPv4 address.`
		49	`.PP`
		50	`.I Remote4`
		51	`is the IPv4 address of the far end of the tunnel`
		52	`(must be given explicitly for a configured tunnel, or`
		53	`defaults to the anycast address 192.88.99.1 for`
		54	`.IR 6to4 ).`
		55	`.PP`
		56	`.I Remote6`
		57	`is the IPv6 address of the far end of the tunnel`
		58	`(used as the point-to-point destination for routing, and`
		59	`defaults to a link-local address constructed from`
		60	`.IR remote4 ).`
		61	`.PP`
		62	`.I 6in4`
		63	`forks a pair of background processes to copy packets to and from`
		64	`the tunnel.`
		65	`.PP`
		66	`Options are:`
		67	`.TF -x`
		68	`.PD 0`
		69	`.TP`
		70	`.B -a`
		71	`permit any remote IPv4 address as the far end of a tunnel.`
		72	`This is likely to be useful for the server side of a tunnel.`
		73	`.TP`
		74	`.B -g`
		75	`add a default route to the tunnel for global IPv6 addresses.`
		76	`.TP`
		77	`.B -x`
		78	`use the network mounted at`
		79	`.I netmtpt`
		80	`instead of`
		81	`.LR /net .`
		82	`.PD`
		83	`.SH EXAMPLES`
		84	`If your primary IPv4 address is public,`
		85	`you can start a`
		86	`.I 6to4`
		87	`tunnel simply with`
		88	`.IP`
		89	`.EX`
		90	`ip/6in4 -g`
		91	`.EE`
		92	`.PP`
		93	`Similarly, you can start a server for`
		94	`.I 6to4`
		95	`tunnels with`
		96	`.IP`
		97	`.EX`
		98	`ip/6in4 -ag`
		99	`.EE`
		100	`.PP`
		101	`If you use a tunnel broker at address`
		102	`.LR 5.6.7.8 ,`
		103	`configured to give you a`
		104	`.L /64`
		105	`subnet with address`
		106	`.LR 2001:1122:3344:5566:: ,`
		107	`you can start the tunnel with`
		108	`.IP`
		109	`.EX`
		110	`ip/6in4 -g 2001:1122:3344:5566::/64 5.6.7.8`
		111	`.EE`
		112	`.SH FILES`
		113	`.TF /net/ipmux`
		114	`.PD 0`
		115	`.TP`
		116	`.B /net/ipmux`
		117	`access to IPv6-in-IPv4 packets`
		118	`.TP`
		119	`.B /net/ipifc`
		120	`packet interface to IPv6 network`
		121	`.SH SEE ALSO`
		122	`.IR bridge (3),`
		123	`.I ipmux`
		124	`in`
		125	`.IR ip (3),`
		126	`.I linklocal`
		127	`in`
		128	`.IR ipconfig (8)`
		129	`.br`
		130	`.B /lib/rfc/rfc3056`
		131	`.br`
		132	`.B /lib/rfc/rfc3068`
		133	`.SH BUGS`
		134	`Needs a kernel with an`
		135	`.I ipmux`
		136	`driver.`
		137	`.PP`
		138	`The tunnel client filters addresses fairly conservatively in both directions.`
		139	`However it's not watertight,`
		140	`and may be flakey in other ways so don't put too much trust in it.`

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