Relay Routers
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... IPv6 domains
via relay routers. Effectively it treats the wide area IPv4 network
as a unicast ...
... domain interconnecting a set of 6to4 routers and
relay routers. It is distinct from an IPv6 site's interior
routing ...
... Although they behave essentially as standard IPv6 routers, for the
purposes of this document they are referred to as relay routers to
distinguish them from routers supporting only 6to4 ...
... a given set of 6to4 border routers, including relay routers,
among themselves, i.e., a 6to4 exterior routing ...
... native IPv6 routing system. Since there will in general be multiple
relay routers advertising it, network operators will require to
filter ...
... default route to the whole
IPv6 address space could be advertised. When multiple relay routers
are in use, more specific routing prefixes would be advertised
...
...
Relay routers introduce the potential for scaling issues. In general
a relay router should not attempt to serve more sites than any other
...
... IPv6 multihoming by using multiple simultaneous IPv6
prefixes and multiple simultaneous relay routers.
...
... routing will include advertisements for the 2002::/16
prefix from relay routers into the native IPv6 domain, whose scope is
limited by routing policy ...
...
It will be necessary for 6to4 routers to obtain routes to relay
routers in order to access the native IPv6 domain. In the simplest
case there will be a manually configured default IPv6 ...
... applied, exceptions to it must be configured to admit traffic from
relay routers (Section 5). 2002:: traffic must also be excepted from
checks applied to prevent spoofing ...