[83139] in North American Network Operators' Group
Re: /8 end user assignment?
daemon@ATHENA.MIT.EDU (Joe Abley)
Fri Aug 5 09:55:53 2005
In-Reply-To: <20050805115444.GA17963@cluecentral.net>
Cc: Bruce Campbell <bc-nanog@vicious.dropbear.id.au>,
NANOG list <nanog@merit.edu>, Bill Woodcock <woody@pch.net>,
Iljitsch van Beijnum <iljitsch@muada.com>
From: Joe Abley <jabley@isc.org>
Date: Fri, 5 Aug 2005 09:55:32 -0400
To: Sabri Berisha <sabri@cluecentral.net>
Errors-To: owner-nanog@merit.edu
On 5 Aug 2005, at 07:54, Sabri Berisha wrote:
>
> On Fri, Aug 05, 2005 at 04:10:46AM -0700, Bill Woodcock wrote:
>>
>> On Fri, 5 Aug 2005, Sabri Berisha wrote:
>>> With the use of anycast DNS servers on the internet, TCP is no
>>> longer an
>>> option for DNS.
>>
>> Bzzzt. Try again.
>
>
> /--[cabernet]--[merlot]--[riesling]--[server 1]
> [end-host] ----- [shiraz] |
> \--[sangria]]--[chardonnay]--[bordeaux]--[server 2]
It is of course possible to construct networks through which TCP
behaves very poorly with anycasted services. This does not mean that
TCP is fundamentally incompatible with anycast.
There are plenty of examples of people anycasting services which
involve long-held TCP sessions (like FTP servers, and HTTP server
serving large media files). Naturally not all networks and not all node
placement decisions will work for these kinds of services, but it is
certainly possible to use anycast to great effect with very high
service quality.
See draft-grow-ietf-anycast-01 for more commentary.
Joe
