Re: [SQU] high-availability proxies

Hi,

On Thu, 21 Dec 2000, Florin Andrei wrote:

> Suppose i wanna build a high-availability proxy: two identical machines,
> with different IP addresses, load-balanced through DNS. If one proxy goes
> down, it's enough to delete it from the DNS records, so the other proxy will
> (hopefully) take the entire traffic.
> Do you think this is a good idea if i wanna minimize the problems with the
> proxy? What other high-availability solutions are there?

On the ISC web site there is/was (can't seem to find it) a discussion
paper on using DNS for "high availability". The basic argument was that
it's a waste of time because most clients don't observe TTLs and often
cache DNS lookup results anyway. So even though you've dropped an entry
from your DNS, the client might not ask again for minutes/hours/days.

Colin

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