Re: [cobalt-users] DNS reverse address lookup, Raq3i

[jale@xxxxxxxxxx]

> > A couple of weeks back there was a post, maybe from Jeff Lasman, that said
> > there should not be Automatic Reverse Address Record Generation records for
> > each domain.
>
> I am sure that Jeff Lasman did not say that.
> You need one reverse ptr record per IP address.

It was either he or someone else, but they said just what I said, which is 
just what you said, that you don't need a reverse ptr per domain, just IP

> And even then unless you have been delegated authority for the ip addresses
> it probably is a useless exercise.
>
> > When we setup our DNS, we went by the book, which had us do that, so for
> > each domain, I have:
> >
> > 1) domain.com --> ip address
> > 2) www.domain.com --> ip address
> > 3) ip address --> domain.com (27 bit)
> > 4) ip address --> www.domain.com (27 bit)
> > 5) domain.com --> high speed mail server www.domain.com
>
> That looks OK, but the 'book' says you should have two mailservers.

See below, I answered another post and commented on this.

> 27 bit, does that mean you have a /27 subnet?
> 32 IP addresses 1, for network, one for gateway and one for broadcast
> so you have 29 useable IP addresses.

Yes, that is correct, 32 IPs = 27 bit mask.

..........

From COMPUTICA's POST:

1) domain.com -->> ip address
2) www.domain.com --> ip address
3) domain.com -->> high speed mail server www.domain.com
4) www.domain.com -->> high speed mail server www.domain.com
This is what we learned when we first got some RaQ's and it has been
working great....if something is wrong with it, I apologize, but like
I said before, it has always worked 100% for us...
------------
Your setup is just what I had in mind from all of this. The only difference 
is we don't routinely have the MX www.domain.com .--> www.domain.com, we 
have not seen a need for that, mail to www.domain.com still gets to us; why 
is this needed?

Thanks to all,
Jale