On Mon, 2011-02-21 at 20:31 +1030, Mark Smith wrote: > Karl Auer <[email protected]> wrote: > > Does anyone know if (and if so in what way) RFC2526 is honoured in the > > real world? > > > > "The construction of a reserved subnet anycast address depends on the > > type of IPv6 addresses used within the subnet, as indicated by the > > format prefix in the addresses. In particular, for IPv6 address > > types required to have 64-bit interface identifiers in EUI-64 format, > > the universal/local bit MUST be set to 0 (local) in all reserved > > subnet anycast addresses, to indicate that the interface identifier > > in the address is not globally unique. IPv6 addresses of this type > > are currently specified to be those having format prefixes 001 > > through 111, except for Multicast Addresses (1111 1111) [3]." > > Reading through the above text and the subsequent text in the RFC a > few times, I don't think it is saying that the subnet anycast address is > derived from the EUI-64 identifier i.e. your MAC address with SLAAC.
I think it is saying that the last seven bits of every 64-bit interface ID where the seventh bit is zero are reserved for anycast addresses! On the face of it, that conflicts directly with SLAAC. The only exceptions are multicast addresses and addresses beginning with (binary) 000. That seems to be what the actual RFC is saying. What interests me, though, is not so much what exactly it says but whether anyone actually (i.e., in practice) *cares* what it says :-) Regards, K. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Karl Auer ([email protected]) +61-2-64957160 (h) http://www.biplane.com.au/kauer/ +61-428-957160 (mob) GPG fingerprint: DA41 51B1 1481 16E1 F7E2 B2E9 3007 14ED 5736 F687 Old fingerprint: B386 7819 B227 2961 8301 C5A9 2EBC 754B CD97 0156
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