On Tue, 2012-07-17 at 00:10 -0500, Jimmy Hess wrote:
Just to reaffirm that. Rfc 4291 states packets sent to the subnet-router anycast will be delivered to one router on the subnet. [...] But what about packets with a destination address on another network and trying to use the anycast address as a 'gateway'? The destination IP in the IP packet header of the forwarded packet won't be the anycast address; the last known hardware address for the IP, if it's unicast, may be down, so it's probably nonsensical to enter an anycast address as default gateway, unless using the subnet anycast address as a router/gateway has special behavior defined elsewhere?
I'm not sure I follow the logic there. If the anycast router changes the packet will be resent to the new subnet anycast router eventually (assuming some layer cares enough about the packet to resend it). The "last known hardware address" doesn't matter any more or less in this scenario than it does in any other routing situation. Regards, K. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Karl Auer (kauer@biplane.com.au) http://www.biplane.com.au/kauer GPG fingerprint: AE1D 4868 6420 AD9A A698 5251 1699 7B78 4EEE 6017 Old fingerprint: DA41 51B1 1481 16E1 F7E2 B2E9 3007 14ED 5736 F687