 |  |
>Now, let's see if I get this right. Bear with me and correct me where wrong!
Re: Classless subnet reverse delegation
From: Men & Mice Support
Date: Friday, June 23, 2000
Time: 4:09:14 pm
>
>I assert...
>First of all, for classless reverse delegation there are actually two
>different delegations involved:
>1. The delegation of the "real" reverse domain, in our case either
>"72.116.212.in-addr.arpa." or "116.212.in-addr.arpa.". This should be
>delegated to our ISP.
>2. The delegation of of the fake classless (if I may call it so)
>"26/64.72.116.212.in-addr.arpa." domain, which should be delegated to
>us.
Except that the actual name of the classless subnet is arbitrary - it
can be a subzone of the class C reverse zone that is delegated to
your servers, or it can be a subzone of a domain zone that you
control. It can even be individual names in a domain you control,
i.e. not a separate subzone. In this case, you'd have to put the PTR
records into the domain zone file.
>Second, our ISP has to create CNAME records for each of our IPs:
>70.72.116.212.in-addr.arpa. CNAME 70.26/64.72.116.212.in-addr.arpa.
>71.72.116.212.in-addr.arpa. CNAME 71.26/64.72.116.212.in-addr.arpa.
>72.72.116.212.in-addr.arpa. CNAME 72.26/64.72.116.212.in-addr.arpa.
>and so on.
Right. Using BIND, there is a simple pair of directives to do this:
$ORIGIN 72.116.212.in-addr.arpa.
$GENERATE 65-126 $ CNAME $.26/64
That's it. Just two lines.
>Third, we create the "26/64.72.116.212.in-addr.arpa." zone in our DNS
>which contains PTR records for all of our IPs:
>70.26/64.72.116.212.in-addr.arpa. PTR ogre.sovle.se.
>71.26/64.72.116.212.in-addr.arpa. PTR sinensis.sovle.se.
>72.26/64.72.116.212.in-addr.arpa. PTR hadal.epicon.nu.
>We of course also feed our secondary with this zone.
>
>All set and done. Is this correct?
Correct.
>If so, then it seems that our ISP hasn't even been delegated the
>"real" reverse domain, so delegating "26/64.72.116.212.in-addr.arpa."
>to us is pointless. Right?
Correct.
____________________________________________________________________
Chris Buxton cbuxton@menandmice.com
Men & Mice http://www.menandmice.com
Makers of: QuickDNS Pro
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