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6IN4(8)								       6IN4(8)

NAME
       6in4 - 6to4 tunnel of IPv6 through IPv4

SYNOPSIS
       ip/6in4	[ -ag ] [ -x netmtpt ] [ local6[/mask] [ remote4 [ remote6 ] ]
       ]

DESCRIPTION
       6in4 sets up and operates a tunnel of IPv6 traffic through an IPv4 con‐
       nection.

       Local6  and  mask define the IPv6 address and subnet of the near end of
       the tunnel (mask defaults to for a single-host tunnel).	If  local6  is
       missing or it defaults to

	      2002:aabb:ccdd::1/48

       where  aa,  bb,	cc and dd are the hexadecimal equivalents of the bytes
       a.b.c.d in this host's primary IPv4 address.

       Remote4 is the IPv4 address of the far end of the tunnel (must be given
       explicitly  for a configured tunnel, or defaults to the anycast address
       192.88.99.1 for 6to4).

       Remote6 is the IPv6 address of the far end of the tunnel (used  as  the
       point-to-point  destination  for	 routing, and defaults to a link-local
       address constructed from remote4).

       6in4 forks a pair of background processes to copy packets to  and  from
       the tunnel.

       Options are:
       -a     permit any remote IPv4 address as the far end of a tunnel.  This
	      is likely to be useful for the server side of a tunnel.
       -g     add a default route to the tunnel for global IPv6 addresses.
       -x     use the network mounted at netmtpt instead of

EXAMPLES
       If your primary IPv4 address is public, you can	start  a  6to4	tunnel
       simply with

	      ip/6in4 -g

       Similarly, you can start a server for 6to4 tunnels with

	      ip/6in4 -ag

       If  you	use a tunnel broker at address configured to give you a subnet
       with address you can start the tunnel with

	      ip/6in4 -g 2001:1122:3344:5566::/64 5.6.7.8

FILES
       /net/ipmux
	      access to IPv6-in-IPv4 packets
       /net/ipifc
	      packet interface to IPv6 network
SEE ALSO
       bridge(3), ipmux in ip(3), linklocal in ipconfig(8)
       /lib/rfc/rfc3056
       /lib/rfc/rfc3068
BUGS
       Needs a kernel with an ipmux driver.
       The tunnel client  filters  addresses  fairly  conservatively  in  both
       directions.   However  it's  not watertight, and may be flakey in other
       ways so don't put too much trust in it.

								       6IN4(8)

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