Re: [cobalt-developers] Mail Settings

["Brad Rathbun" <brad@xxxxxxxxxxxxxxx>]

> >But you should only have ONE PTR record per IP#.  If you don't already
> >have a PTR record for the IP# on which this virtual site resides, then
> >you need to have one, and only one.  Personally, I recommend setting it
> >to the machine's canonical hostname and domain name.
>
> I have many for each IP, that's the idea of virtual hosting

I think the "idea of virtual hosting" is that you can share one IP address
amongst many domains, not that you can have multiple PTR records per IP. I
may be wrong, but I thought the purpose of the PTR record was to allow for
reverse lookup to match an IP address to a domain name, which should be a
one to one relationship. The PTR record shows only the direct connections to
the network and that is (should be?) the hostname of your Cobalt server if
you are using only one IP address on it.

While it won't necessarily harm anything defining multiple PTR records for a
single IP address, I don't think it will help anything at all. I usually
avoid adding extra *harmless* things that aren't supposed to be there
because they have a tendency to cause other problems somewhere down the
line. As the "grasshopper book" says, "you can create two PTR records
...[stuff snipped].... but most systems are not prepared to see more than
one name for an address."

If I'm clueless and confused, someone please correct me so I don't continue
in my ignorance.

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Brad Rathbun
Follow the Leader! CompuTech Internet Services