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Date:      Wed, 17 Jan 2007 15:26:45 +0100
From:      "freebsd" <freebsd@gorlani.net>
To:        "FreeBSD Questions" <freebsd-questions@freebsd.org>
Subject:   Re: Load balancing outgoing mail relay
Message-ID:  <000601c73a43$8683c170$6601880a@Enigma>

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>This (multiple A records) works for me, at least approximately. Both
>Bind and MS DNS will round robin when multiple A records exist for the
>same hostname. What is your setup?

FreeBSD 6.2 with Sendmail (initially) and now postfix.
MS DNS with round robin (and TTL set to 0 on the records).
Resolving with nslookup gives something like:
smarthost.domain.tld
192.168.0.1, 192.168.0.2, 192.168.0.3

If I kill 192.168.0.1 then it goes on the second one. But this is failover, 
and I need (approximately) load balancing.
I understand this is related to the MTA and not to the OS, but hopefully 
someone solved this problem using Sendmail or Postifx that are both used on 
FreeBSD.
Thanks





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