One Domain; Multiple IPs.

Kevin Darcy kcd at daimlerchrysler.com
Mon Jul 16 22:00:58 UTC 2001


Barry Margolin wrote:

> In article <9ivl4j$89l at pub3.rc.vix.com>,
> Kevin Darcy  <kcd at daimlerchrysler.com> wrote:
> >
> >Joseph S D Yao wrote:
> >> You could have two name servers, giving out different IP addresses.
> >> That way, if one side goes down, only HALF the accesses would be to the
> >> dead IP address.
> >
> >According to some interpretations, this is a DNS protocol violation. One
> >could rationalize it as a very volatile data, but even in that case the
> >protocol purists would insist that the SOA serial number be incremented
> >every time the zone "changed", i.e. every time a different response was
> >given by either nameserver.
>
> If it's a violation, it's one that's being violated constantly by most of
> the biggest web site operators.  Software and devices like lbnamed and
> Distributed Director return different answers depending on a variety of
> conditions, such as the load on the server or the location of client.

I agree. The protocol purists appear to be out of touch with the way DNS is
evolving in the real world.


- Kevin





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