To:
Brad Knowles <brad.knowles@skynet.be>
Cc:
Bill Woodcock <woody@pch.net>, Bruce Campbell <bruce.campbell@ripe.net>, <dnsop@cafax.se>
From:
Randy Bush <randy@psg.com>
Date:
Tue, 05 Nov 2002 07:54:47 -0800
Sender:
owner-dnsop@cafax.se
Subject:
Re: quibbles about what is anycast.
>> Brad Knowles wrote faster than he thought: >>> True anycast for protocols other than UDP? I sincerely doubt it. >>> If you have evidence for this, I'd love to see it. >> Works fine for TCP and ICMP. What protocols do you have doubts about? > I have doubts about TCP. Can you explain in more detail how it works for > TCP, especially for the case where the route from IP address A to IP > address B changes to a different machine that serves IP address B, while > in the middle of a connection? And how often do route changes occur? in actual use, we have been surprised at how well anycast tcp works within a large isp. like O(10^5) users for multiple hours. most routing instability has a relatively small number of real causes. randy #---------------------------------------------------------------------- # To unsubscribe, send a message to <dnsop-request@cafax.se>.