round-robin

[Barry Margolin]

In article <9sep6v$ekc at pub3.rc.vix.com>,
Michele Chubirka  <chubirka at gwu.edu> wrote:
>Only problem is that stricter Sendmail security will reject the mail if
>forward and reverse records don't match.

If the connection comes from 10.10.10.3 it will resolve to smtp1.gwu.edu,
which resolves to 10.10.10.3 -- it matches.  If the connection comes from
10.10.10.4 it will resolve to smtp2.gwu.edu, which resolves to 10.10.10.4
-- another match.

What doesn't match?  The extra A records for smtp.gwu.edu will never be
noticed.

>-----Original Message-----
>While the setup he showed will work, I would recommend something like:
>
>$ORIGIN gwu.edu.
>smtp  IN A 10.10.10.3
>      IN A 10.10.10.4
>smtp1 IN A 10.10.10.3
>smtp2 IN A 10.10.10.4
>
>$ORIGIN 10.10.10.in-addr.arpa.
>3     PTR  smtp1.gwu.edu.
>4     PTR  smtp2.gwu.edu.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
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