[ale] more reverse DNS questions

[Lightner, Jeff]

The ISP does reverse delegations to their customer.  If they've already delegated the range that includes the IP donated to you to the company that donated it to you that company can delegate it to you or make the reverse entry on their own DNS server(s).   Alternatively they could request the ISP change the delegation range to exclude the one to you then do a delegation to you for that one.   I'd think that alternative would be a PITA for the donator.

But yes in general:
You tell the Registrar (GoDaddy in your case) the DNS information for forward lookups (or at least what your DNS servers are - many of the Registrars will also let you put records (A, CNAME, MX etc...) on their site.
You tell the ISP the DNS information for the reverse lookups (typically a delegation to your DNS servers).





-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of John Heim
Sent: Friday, January 06, 2012 4:01 PM
To: Atlanta Linux Enthusiasts
Subject: [ale] more reverse DNS questions

Last week I was asking about using godaddy for DNS. Well, I finally figured
out how to get godaddy to let us run our own DNS server. Toward the bottom
of the page for setting nameservers is a button called "Host summary". You
have to enter the names and IP addresses of your nameservers on that page
before you can enter them onto the list of nameservers for your domain. So I
did that and now we are up and running.

Well, except for one thing. you can't do a reverse lookup on the IP address
of our virtual machine. There is nothing I can do about that, right? This is
a vm that is donated to us by a local web services company.  Its one thing
to tell the world that www.iavit.org goes to 66.170.20.226. That can't mess
anything up. But you can't have just anybody doing it the other way around.
If that was something anybody could do, the internet could be severaly
messed up.

So if I understand the way the internet works, I'm going to have to go to
the company that donated the virtual machine and get them to contact their
ISP on our behalf. Is that correct?

PS: Here is my forward lookup zone file. Can anybody tell me if I've done
anything wrong?

$TTL 86400 ; 24 hours could have been written as 24h or 1d
$ORIGIN iavit.org.
@ IN SOA iavit.iavit.org. hostmaster at iavit.org. (
         2011062601 ; serial
         3H ; refresh
         15 ; retry
         1w ; expire
         3h ; minimum
        )
;define name servers on domain
    IN NS ns1
iavit.org.     IN TXT "v=spf1 mx ~all"
    IN  MX 10  mailhost
    IN  A      66.170.20.226
iavit IN A 66.170.20.226
lists IN A 66.170.20.226
ns1 IN A 66.170.20.226
ns2 IN A 66.170.20.226
mailhost IN CNAME iavit
wiki           IN CNAME iavit
www            IN CNAME iavit


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