Adding two IP addresses for one host

[Michael Kjorling]

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SRV records. But most clients don't make any use of them, so that
would probably not help you much.

The solution that comes to my mind is running a split DNS - it won't
eliminate downtime, but by reducing the TTLs in advance you can limit
the time your systems are unavailable. Simply make one instance of
named listen to the new IP address, and one listen to the old one; and
serve the appropriate records.


Michael Kjörling


On Aug 31 2001 11:04 -0700, erik B wrote:

> We have some servers that will be moving soon, so that we don't have
> to update all the DNS records when it moves, we would like to put in
> two IP records for te same host so that when the first one quits
> working, the second will take over.  The Oreilly BIND book indicates
> that if you simply put in 2 IP's it is a round robin thus there is no
> guarantee that the correct host will be found.  Is there a better way
> to do this to ensure they hit the server?  Something along the same
> line as doing two different MX records and making one a 10 record, the
> next a 20 record, etc??
>
> as an example, here is what I am talking about, but from the book,
> this will not work that the domain always resolves to the "working"
> domain.
>
> server.ourdomain.net   IN A    192.168.225.8
> server.ourdomain.net   IN A    192.168.127.5
>
> (These IP's are obviously just examples, we are using a routable class
> C)

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