dns based loadbalancing/failover

Sun Oct 7 15:51:27 UTC 2001

> Date: Sat, 6 Oct 2001 19:17:39 +0200
> From: bert hubert <ahu at ds9a.nl>

[ snip ]

> It gets even better - recursing nameservers have the habit of
> locking in to nameservers that respond quickest. So you even
> get some loadbalancing awareness.

Odd.  I've investigated this effect (well aware of it in theory)
with stateside-only machines, and DNS frequently returns a
horrible choice.  Maybe caching prevents enough authoritative
answers from being returned to cancel out the noise, but I've
seen the opposite of what you report.

> We operate nameservers in the US and in Europe, and we
> definitely see this effect.

Maybe it works well over different continents, but simple "use
different IPs from different NS" has not given desirable results
in my experience.

Then we have the failover and TTL issues...

Eddy

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