nanog mailing list archives
Re: Anycast reliability (was: Re: verizon.net and other email grief)
From: Joe Abley <jabley () isc org>
Date: Mon, 13 Dec 2004 17:24:54 -0500
On 13 Dec 2004, at 15:27, Steve Gibbard wrote:
On Mon, 13 Dec 2004, Simon Waters wrote:Inspection suggests that the anycast announcements in the UK were pointing to a server that wasn't accepting email.I believe here the problem is using anycast, and not providing a backupsystem not using anycast. The previous case I'm aware of was when bitsof the NE USA lost ".org" because they only had anycast DNS servers (andstill do AFAIK), and the announcement messed up.Whilst I plead ignorant of the technical details of anycast, strikes methat it is clearly more complex, and thus more prone to failure, and these failures are potentially less obvious.(for anybody reading this who doesn't know, anycast is multiple servers in multiple locations announcing routes and accepting connections to the sameIP address).
Distribution of a service (whether by anycast or by some other means) is bound to introduce complexity over that incurred by a single instance of a service running in just one place. In some cases, the cost of that complexity is offset by reduced costs (or risk) elsewhere, and anycast makes sense.
For a discussion of some of the issues surrounding service distribution using anycast, see:
http://www.ietf.org/internet-drafts/draft-kurtis-anycast-bcp-00.txtFlames and projectiles relating to that draft would be very gratefully received (either directly or on the GROW list, but probably not on NANOG).
Joe
Current thread:
- Re: verizon.net and other email grief, (continued)
- Re: verizon.net and other email grief Steven Champeon (Dec 10)
- Re: verizon.net and other email grief Valdis . Kletnieks (Dec 10)
- Re: verizon.net and other email grief Jeffrey I. Schiller (Dec 10)
- Re: verizon.net and other email grief Krzysztof Adamski (Dec 10)
- Re: verizon.net and other email grief Crist Clark (Dec 10)
- Re: verizon.net and other email grief Jeffrey I. Schiller (Dec 10)
- Re: verizon.net and other email grief Rich Kulawiec (Dec 12)
- Re: verizon.net and other email grief Simon Waters (Dec 13)
- Re: verizon.net and other email grief Suresh Ramasubramanian (Dec 13)
- Anycast reliability (was: Re: verizon.net and other email grief) Steve Gibbard (Dec 13)
- Re: Anycast reliability (was: Re: verizon.net and other email grief) Joe Abley (Dec 13)
- Re: verizon.net and other email grief Todd Vierling (Dec 14)
- Re: verizon.net and other email grief Daniel Karrenberg (Dec 16)
- Re: verizon.net and other email grief Iljitsch van Beijnum (Dec 16)
- Re: verizon.net and other email grief just me (Dec 16)
- Re: verizon.net and other email grief Iljitsch van Beijnum (Dec 16)
- Re: verizon.net and other email grief Steve Gibbard (Dec 16)
- Re: verizon.net and other email grief Joe Maimon (Dec 16)
- Re: verizon.net and other email grief Bill Woodcock (Dec 16)
- Dampening considered harmful? (Was: Re: verizon.net and other email grief) Jared Mauch (Dec 16)
- Re: Dampening considered harmful? (Was: Re: verizon.net and other email grief) Jerry Pasker (Dec 16)