one A record, different IP address
Mathias Körber
mathias at koerber.org
Thu Dec 7 07:53:23 UTC 2000
> I have a rather general question. Is it possible to have one host (A)
> record point to multiple IPs?
It is possible, but that's not one A record, it's two A records inthe
same RRset (Resource Record Set =3D all records which share a common =
owner
[left-hand-side+$ORIGIN], class and type). Note that all records in an
RRset should (must? I think Bind-9 enforces this, but I'll have to
check that again) have the same TTL.
> For example
>=20
> WWW IN A 204.94.91.4
> WWW IN A 204.94.91.3
This is fine. Resolvers should see both addresses, in a (pseudo-)random
order. Applications should contact the first address returned by the
resolver, and if that fails fall back to the other one. This gives
rudimentary load-balancing.
Applications should stick to the one address that works for the duration
of a networking session (and use the same address for additional
connections if required), and only query/select another address if the =
session
is terminated or closed.
regards
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