CNAME, MX and more
Michael Kjorling
michael at kjorling.com
Mon Feb 4 17:23:00 UTC 2002
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On Feb 4 2002 10:04 +0100, Paco Orozco wrote:
> Hiya,
>
> Imagine this scenario:
>
> Scenario 1:
>
> nmg.hola.com. IN A 10.0.0.1
> nmg.hola.com. IN MX 10 mailhost1.hola.com.
> IN MX 20 mailhost2.hola.com.
>
> Is this possible??? Is there any mistake?
You don't define A records for mailhost[12].hola.com. Other than that
there is no problem with this DNS data, syntactically speaking.
> Scenario 2:
>
> nmg.hola.com. IN CNAME server.hola.com.
> nmg.hola.com. IN MX 10 mailhost1.hola.com.
> IN MX 20 mailhost2.hola.com.
>
> Is this possible??? Is there any mistake???
>
> Thanks
This must be one of the most frequently asked questions around here.
Try searching for "CNAME and other data" in the archives. RFC 1034
section 3.6.2:
"If a CNAME RR is present at a node, no other data should be present;
this ensures that the data for a canonical name and its aliases cannot
be different."
This restriction has been lessened recently in that SIG, NXT and KEY
records are allowed alongside CNAMEs, for DNSSEC purposes (though I
don't remember which exact RFC codifies this off the top of my head).
Any questions?
Michael Kjörling
- --
Michael Kjörling -- Programmer/Network administrator ^..^
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