3 6in4, ayiya - configure and run automatic or manual tunnel of IPv6 through IPv4
46 sets up and maintains a 6to4 tunnel of IPv6 traffic through an IPv4 connection.
48 is similar, but uses the UDP based Anything In Anything protocol to
54 define the IPv6 address and subnet of the near end of the tunnel
66 .BI 2002: aabb : ccdd ::1/48
74 are the hexadecimal equivalents of the bytes
77 in this host's primary IPv4 address.
80 is the IPv4 address of the far end of the tunnel
81 (must be given explicitly for a configured tunnel, or
82 defaults to the anycast address 192.88.99.1 for
86 is the IPv6 address of the far end of the tunnel
87 (used as the point-to-point destination for routing, and
88 defaults to a link-local address constructed from
91 The program forks a pair of background processes to copy packets to and from
101 permit any remote IPv4 address as the far end of a tunnel.
102 This is likely to be useful for the server side of a tunnel.
107 define what is the local IPv4 address, otherwise it takes the first
108 non-loopback address of the outside IP stack.
111 use the tunnel as the default route for global IPv6 addresses
115 specifies the outside MTU in bytes from which the inside
116 tunnel MTU is derived. Deaults to 1500 - 8 (Ethernet - PPPoE).
119 use the network mounted at
123 for binding the tunnel interface and sending/receiving IPv4
131 for the IPv4 packets but bind the IPv6 interface on
135 when specified by a previous
142 use the shared secret key
144 to authenticate messages on the tunnel.
147 If your primary IPv4 address is public,
156 Similarly, you can start a server for
164 If you use a tunnel broker at address
166 configured to give you a
169 .LR 2001:1122:3344:5566:: ,
170 you can start the tunnel with
173 ip/6in4 -g 2001:1122:3344:5566::/64 5.6.7.8
180 access to IPv6-in-IPv4 packets
183 packet interface to IPv6 network
197 .B http://tools.ietf.org/id/draft-massar-v6ops-ayiya-02.txt
199 Needs a kernel with an
203 The tunnel client filters addresses fairly conservatively in both directions.
204 However it's not watertight,
205 and may be flakey in other ways so don't put too much trust in it.