RFC 3068 (rfc3068) - Page 2 of 9


An Anycast Prefix for 6to4 Relay Routers



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RFC 3068        An Anycast Prefix for 6to4 Relay Routers       June 2001


   automatically routed to the nearest available router.  It allows the
   managers of the 6to4 relay routers to control the sources authorized
   to use their resource.  It makes it easy to set up a large number of
   6to4 relay routers, thus enabling scalability.

2 Definitions

   This memo uses the definitions introduced in [RFC 3056], in particular
   the definition of a 6to4 router and a 6to4 Relay Router. It adds the
   definition of the 6to4 Relay anycast prefix, 6to4 Relay anycast
   address, 6to4 IPv6 relay anycast address, and Equivalent IPv4 unicast
   address.

2.1 6to4 router (or 6to4 border router)

   An IPv6 router supporting a 6to4 pseudo-interface.  It is normally
   the border router between an IPv6 site and a wide-area IPv4 network.

2.2 6to4 Relay Router

   A 6to4 router configured to support transit routing between 6to4
   addresses and native IPv6 addresses.

2.3 6to4 Relay anycast prefix

   An IPv4 address prefix used to advertise an IPv4  route to an
   available 6to4 Relay Router, as defined in this memo.

   The value of this prefix is 192.88.99.0/24

2.4 6to4 Relay anycast address

   An IPv4 address used to reach the nearest 6to4 Relay Router, as
   defined in this memo.

   The address corresponds to host number 1 in the 6to4 Relay anycast
   prefix, 192.88.99.1.

2.5 6to4 IPv6 relay anycast address

   The IPv6 address derived from the 6to4 Relay anycast address
   according to the rules defined in 6to4, using a null prefix and a
   null host identifier.

   The value of the address is "2002:c058:6301::".






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