Preferred method of advertizing a dual-stack mx server

[Scott Prader]

* Patrice Fournier (pfournier@loups.net) cobbled forth:
> Hi all,
> 
> setup such as (and would that be the preferred setup considering that the
> first one showed causes problems?):
> example.net.           IN MX   0 mail.ipv4.example.com.
> example.net.           IN MX   0 mail.ipv6.example.com.

You may want to try changing the MX handlers to the following:

example.net.        IN  MX  10  mail.ipv6.example.com.
example.net         IN  MX  20  mail.ipv4.example.com.

This will simply try to deliver mail to the ipv6-capable host first,
then fall back on the ipv4 host.  The reasoning is that by using the
same priorities will generally cause a round-robin situation, in which
the mail and dns servers won't care which host it goes to, but with a
defined priority schedule if the first host doesn't work it will fall
back to the other host by default instead of becoming confused. HTH

         .oO Gnea [gnea at garson dot org] Oo.
            .oO url [http://gnea.net] Oo.

"You can tune a filesystem, but you can't tune a fish." -Kirk McKusick