Re: Re: Problems with spf testsuite and dns specification

Julian Mehnle ha scritto:
> Stefano Bagnara wrote:
>> IMHO the problem is not "to compact or not to compact". The problem is
>> requiring a PermError (a specific different action) on something that
>> the DNS spec tell us is not different from a single record.
>> To use your "question": show me any other DNS application that specifies
>> a different behaviour on multiple identical RRs ;-)
> 
> SMTP, MX records.  Multiple identical RRs make a typical SMTP client 
> perform multiple lookups, not one.  At least, RFC 2821 section 5 doesn't 
> specify any MX RR compaction.

Well, on SMTP you will find me prepared as I'm a developer of Apache
JAMES SMTP server :-)

rfc2821 DOES NOT add any specification related to multiple identical MX
RRs: it simply rely on what the underlying DNS implementation do, as it
is supposed to. The fact is that if you want to define your load
balancing the only way to make it working every time is to define
multiple MX pointing to *different* host names, having (if needed) some
host name to point to the same address (but not using multiple identical
IP for the same host or multiple identical MX names).

The important thing to be noticed is that SMTP does not add any
specification that will alter the final behavior in a critical way
depending on the underlying dns chain "compression" policy.

IMHO the whole thing is really not very important as publisher ar e not
supposed to publish multiple records at all (identical or different) and
we are only discussing how to improve and make more predictable the
corner case (for not compliant published records) handling.

So, if there is agreement that at least the testsuite is inappropriate,
please let's find a short way to this and let's change the duplicates to
be different :-)

Thank you,
Stefano

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