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Men & Mice Support said:
Re: Multiple CNAMES... who cares?
From: Mia''s Virtual Post Office
Date: Friday, July 30, 1999
Time: 5:59:00 pm
>>oops, you're right! Thanks, Chris, for clarifying all the points (er,
>>PTRs). I meant to say:
>>
>>> >Right now, I have it set up like so:
>>> >
>>> >mydomain.com. NS ns2.mydomain.com.
>>> >ns2.mydomain.com. A 198.0.0.0
>>> >
>>> >mydomain.com. MX mail.mydomain.com
>>> >mail.mydomain.com CNAME ns2.mydomain.com
>>
>>But I realize that this would be wrong.
>>
>>However, using the above scenario, does it matter if my secondary DNS
>>("ns2") doesn't have a PTR record (I have to reserve the PTR for the
>>mailserver record)?
>
>PTR records are almost totally irrelevant for a server.
Are you sure about this?
>
>The only service for which PTR records are currently used is mail, for
>anti-spam measures. Therefore, it is important to have a PTR record that
>matches the name of your mailhost (as specified in your MX record).
I number of IRC and ftp servers, (especially on the University level)
require that they be able to check your reverse records to allow access.
jer
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