nanog mailing list archives
Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses)
From: Jeroen Massar <jeroen () unfix org>
Date: Thu, 21 Oct 2010 21:51:49 +0200
On 2010-10-21 21:35, George Bonser wrote:
From: Jeroen Massar > Sent: Thursday, October 21, 2010 9:57 AM To: Allen Smith Cc: NANOG list Subject: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) [Oh wow, that subject field, so handy to indicate a topic change! ;) ] Short answer: you announce both PA prefixes using Router Advertisement (RA) inside the network. You pull the RA when a uplink goes down/breaks.That assumes importing some sort of routing state into your RA config. Sort of a conditional RA. Can that be done today by anyone?
Should be possible with any vendor that supports IPv6. If you take a vendor C box and the box dies (just pull the power plug to test this or configure it with something funky ;), Neighbor Discovery starts failing and every IPv6 stack that I know will deprecate the routes over that gateway, and stuff fails over. For 'production usage', let your monitor script login to your router, whatever brand/make/model that is, and unconfigure the RA or heck kill the radvd daemon.
Sessions break indeed, but because there is the other prefix they fall over to that and build up new sessions from there.This still doesn’t address breakage that happens AFTER your link to your upstream. What if your upstream has a peering issue or their peer has a peering
issue?
How do you detect that the distant end has a route back to that
prefix but
doesn't to the other? You can't.
Solve it the way you solve it with PI: - Get an SLA with every destination you want to reach Indeed, that is a more or less unsolveable problem. You can of course monitor all the destinations you want to reach and based on that to use the prefix or not. Greets, Jeroen
Current thread:
- Re: IPv6 fc00::/7 — Unique local addresses, (continued)
- Re: IPv6 fc00::/7 — Unique local addresses Owen DeLong (Oct 21)
- Re: IPv6 fc00::/7 — Unique local addresses Ray Soucy (Oct 21)
- Re: IPv6 fc00::/7 — Unique local addresses Allen Smith (Oct 21)
- Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Jeroen Massar (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Phil Regnauld (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Owen DeLong (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Mark Andrews (Oct 21)
- RE: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) George Bonser (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Jack Bates (Oct 21)
- RE: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) George Bonser (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Jeroen Massar (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — Unique local addresses) Owen DeLong (Oct 21)
- RE: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses) George Bonser (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses) Leo Bicknell (Oct 21)
- RE: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 -Unique local addresses) George Bonser (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses) Adrian Chadd (Oct 21)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses) Valdis . Kletnieks (Oct 31)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses) Owen DeLong (Oct 31)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses) Christopher Morrow (Oct 31)
- RE: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 -Unique local addresses) George Bonser (Oct 31)
- Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 -Unique local addresses) Christopher Morrow (Oct 31)