El 25/04/12 14:27, Wietse Venema escribió:
Fernando Gozalo:
Hi,
Fernando Gozalo:
Hi,
does the postfix smtp client implement the IPv6 to IPv4 fallback
mechanism as browsers do?
Postfix implements the MX fallback strategy as defined in the SMTP
RFC (5321). In addition, Postfix implements this:
smtp_address_preference (default: any)
The address type ("ipv6", "ipv4" or "any") that the Postfix SMTP client
will try first, when a destination has IPv6 and IPv4 addresses with
equal MX preference. This feature has no effect unless the inet_proto-
cols setting enables both IPv4 and IPv6. With Postfix 2.8 the default
is "ipv6".
This feature is available in Postfix 2.8 and later.
Wietse
It works with 1 mx with A and AAAA records.
It didn't work with 2 mx with both A and AAAA records
(https://bugzilla.redhat.com/show_bug.cgi?id=813863).
What is your smtp_address_preference setting?
Some Idiot Linux distros turn on IPv6 by default, and break Postfix
when a destination has more than two primary MX IP addresses.
For this reason I have changed the default smtp_address_preference
setting. I suggest changing your smtp_address_preference setting,
or upgrading to a newer Postfix that works around Idiot Linux
distros.
About this, I have a better solution: trust in MX fallback and not in
IPv6-to-IPv4 fallback mechanism. The lesson learned with this problem
is: always have 1 mx with no AAAA record.
--
Un saludo.
Fernando.
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Fernando Gozalo Rodrigo - Analista de Sistemas
Centro de Sistemas Informáticos
Universidad Nacional de Educación a Distancia
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