[ale] more reverse DNS questions

[Michael H. Warfield]

On Fri, 2012-01-06 at 21:32 +0000, Lightner, Jeff wrote:
> 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.

They haven't delegated it further.  I did an SOA and NS check and it
comes back as Supranet.net right to that address and they've got a /19
block there.

> 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).

Regards
Mike

> -----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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-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
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