One Domain; Multiple IPs.
Barry Margolin
barmar at genuity.net
Thu Jul 19 00:25:58 UTC 2001
In article <9j56g6$ifg at pub3.rc.vix.com>,
Brad Knowles <brad.knowles at skynet.be> wrote:
>
>At 5:31 PM +0100 7/18/01, Marc.Thach at radianz.com wrote:
>
>> Are you implying anycast addressing between the server farms? If so, then
>> persistent connections to those servers will be vulnerable to routing
>> changes outside the control of the client or the server.
>
> This is no change from what would happen if you had been given a
>particular IP address to access, and then the routing tables changed
>underneath you when you were in the middle of accessing the
>appropriate port on that address.
No it isn't. The new routing table would still get you to the same server,
just via a different path. The TCP layer wouldn't notice anything except a
short delay while waiting for routing to stabilize.
With an anycasting system, the IP address could suddenly be redirected to a
totally different server farm, because the routing table now makes that
farm seem closer.
--
Barry Margolin, barmar at genuity.net
Genuity, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
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