[62495] in North American Network Operators' Group
Re: .ORG problems this evening
daemon@ATHENA.MIT.EDU (Keptin Komrade Dr. BobWrench III e)
Thu Sep 18 13:56:44 2003
Date: Thu, 18 Sep 2003 13:47:01 -0400
From: "Keptin Komrade Dr. BobWrench III esq." <bownes@web9.com>
To: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>
Cc: nanog@merit.edu
In-Reply-To: <Pine.LNX.4.44.0309181716040.17449-100000@pop.ict1.everquick.net>
Errors-To: owner-nanog-outgoing@merit.edu
E.B. Dreger wrote:
> TV> Date: Thu, 18 Sep 2003 13:01:18 -0400 (EDT)
> TV> From: Todd Vierling
>
> TV> BGP doesn't know when a DNS server dies. Therein lies the
> TV> findamental problem of using anycast as an application
> TV> redundancy scheme.
>
> But it can and should. Again, seeing if the process is running
> is easy; verifying correct functionality requires more work, but
> definitely is doable.
And, I might add, in the case of a highly complex anycast application,
you will need to check not only for correctness, but for timeliness.
And, again, in the case of a highly complex app such as an anycast DNS,
you need to check several behind the scenes apps, such as maybe a db,
the responsivness of your high avail partner server, the dns daemon,
connectivity through two or more network paths, connectivity to master
update servers, BGP on whatever boxes are providing BGP, etc, the list
goes on.
But again, that's just my opinion, I could be wrong. ;-)
