Karl, >>> For situations apparently needing the subnet router anycast address, >>> there is the all-routers-on-link multicast address. Not that it would >>> normally be needed, because any node on the link has (or can cheaply >>> build) a list of all routers on the link by just watching the RAs, >>> something it has to do anyway. A node can then choose a router at >>> random, or any router based on any criteria it likes. Alternatively an >>> application can ping the all-routers-on-link multicast address and build >>> a list of responders. There is no need for the subnet router anycast >>> address. >> >> A residential gateway router is not going to be able to do this for a >> variety of reasons. > > Could you expand on that? Do you mean on the inside network or the > outside network And which of the three alternatives (all-routers, > RA-watching, ping) are not going to work?
from RFC5969: The 6rd link is modeled as an NBMA link similar to other automatic IPv6 in IPv4 tunneling mechanisms like [RFC5214], with all 6rd CEs and BRs defined as off-link neighbors from one other. The link-local address of a 6rd virtual interface performing the 6rd encapsulation would, if needed, be formed as described in Section 3.7 of [RFC4213]. However, no communication using link-local addresses will occur. a 6rd link doesn't have RAs, and doesn't support link-local addressing. cheers, Ole -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
