nanog mailing list archives
Re: Intradomain DNS Anycast revisited
From: Alexander Koch <koch () tiscali net>
Date: Sat, 26 Mar 2005 09:17:06 +0100
On Thu, 24 March 2005 22:25:36 -0800, Bill Woodcock wrote:
No, because both routers are reached through the same L1/L2 medium, so Quagga can't use link-state to determine reachability of the next-hop. You could fix that by getting rid of the switches, and just having a bunch
Hmh. Thinking of it, for Anycast to work I would rather run Quagga's BGP daemon and announce the /32 (or whatever it is in your setup) of the DNS server, and maybe receive a 0/0 from the router (not needed when the router no longer sees your /32 as then you will simply not receive requests any longer). All BGP with appropriate timers (some few seconds only), and if you want you can put some simple scripts on this box as well that further check if things are working. All that as less and less real routers[tm] have FE connection in them where you could work on link-state... and you need a 'dynamic' component to tell you the connection over some GE aqggregation gear is still there, and if you combine this with the monitoring of the service itself it should pretty much work out. Mind you, this is theory. Looks quite sound to me though. I like BGP more as I could transport that /32 with no-export right away. Regards, Alexander
Current thread:
- Intradomain DNS Anycast revisited Joe Shen (Mar 24)
- Re: Intradomain DNS Anycast revisited Bill Woodcock (Mar 24)
- Re: Intradomain DNS Anycast revisited Alexander Koch (Mar 26)
- MARP (was Re: Intradomain DNS Anycast revisited) Mikael Abrahamsson (Mar 26)
- Re: Intradomain DNS Anycast revisited Bill Woodcock (Mar 28)
- Re: Intradomain DNS Anycast revisited Peter John Hill (Mar 28)
- Re: Intradomain DNS Anycast revisited Alexander Koch (Mar 26)
- Re: Intradomain DNS Anycast revisited Bill Woodcock (Mar 24)
- Re: Intradomain DNS Anycast revisited just me (Mar 26)
- Re: Intradomain DNS Anycast revisited Peter John Hill (Mar 27)
- Re: Intradomain DNS Anycast revisited Edward B. Dreger (Mar 27)
- Re: Intradomain DNS Anycast revisited Peter John Hill (Mar 27)
- <Possible follow-ups>
- Re: Intradomain DNS Anycast revisited Joe Shen (Mar 24)
- Re: Intradomain DNS Anycast revisited Bill Woodcock (Mar 30)