nanog mailing list archives
Re: using "reserved" IPv6 space
From: Karl Auer <kauer () biplane com au>
Date: Tue, 17 Jul 2012 15:29:06 +1000
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
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Current thread:
- Re: using "reserved" IPv6 space, (continued)
- Re: using "reserved" IPv6 space Ray Soucy (Jul 16)
- Re: using "reserved" IPv6 space Seth Mos (Jul 16)
- Re: using "reserved" IPv6 space Owen DeLong (Jul 16)
- Re: using "reserved" IPv6 space Seth Mos (Jul 17)
- Re: using "reserved" IPv6 space Rajendra Chayapathi (rchayapa) (Jul 16)
- Re: using "reserved" IPv6 space Oliver (Jul 16)
- Re: using "reserved" IPv6 space Rajendra Chayapathi (rchayapa) (Jul 16)
- Re: using "reserved" IPv6 space Matt Addison (Jul 16)
- Re: using "reserved" IPv6 space Karl Auer (Jul 16)
- Re: using "reserved" IPv6 space Jimmy Hess (Jul 16)
- Re: using "reserved" IPv6 space Karl Auer (Jul 16)
- Re: using "reserved" IPv6 space Jimmy Hess (Jul 16)
- Re: using "reserved" IPv6 space Owen DeLong (Jul 16)
- Re: using "reserved" IPv6 space Karl Auer (Jul 16)
- Re: using "reserved" IPv6 space Owen DeLong (Jul 16)
- Re: using "reserved" IPv6 space Karl Auer (Jul 17)
- Re: using "reserved" IPv6 space Matt Addison (Jul 17)
- Re: using "reserved" IPv6 space Doug Barton (Jul 17)
- Re: using "reserved" IPv6 space Owen DeLong (Jul 16)
- Re: using "reserved" IPv6 space Oliver (Jul 17)
- Re: using "reserved" IPv6 space Jimmy Hess (Jul 16)