Reverse Look on a half class C

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webmaster@mbcl.org - 04 May 2004 21:13 GMT

We currently have a half class C IP block.

My ISP told me to use

0/25.3.2.1.in-addr.arpa for the name of the reverse zone.

it wont work so they said to use 0-25.3.2.1.in-addr.arpa

I creates that name OK..

It will not auto create the PTR records, and I can't
figure out how to add them my self. The ISP sent me an
example but I am thinking it must have been for 2000
becasue DNS would not restart after edit of the .DNS file.

How do I get this reverse lookup created with the proper
records?

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Kevin D. Goodknecht [MVP] - 04 May 2004 21:34 GMT

> We currently have a half class C IP block.
>
[quoted text clipped - 13 lines]
> How do I get this reverse lookup created with the proper
> records?

Use the DNS console, click Action, new Pointer, type in the host IP number
and the hostname.
When your ISP delegates it to you with a CNAME referral it will be like
1.0-25.3.2.1.in-addr.arpa. which would be for IP 1.2.3.1 which reverses to
1.3.2.1.in-addr.arpa.
One way to check to see how it is delegated to you is to go to
www.dnsstuff.com where you will get a report of the CNAME they used.
See the one below for one of mine that reverses 65.65.91.211
Asking NS2.SWBELL.NET. for 211.91.65.65.in-addr.arpa PTR record: Got CNAME
referral to ns1.lonestaramerica.com. (zone 211.208.91.65.65.in-addr.arpa.)
Asking ns1.lonestaramerica.com. for 211.208.91.65.65.in-addr.arpa. PTR
record: Reports mail.lsaol.com.
My zone name is 208.91.65.65.in-addr.arpa.

Signature

Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
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Jonathan de Boyne Pollard - 06 May 2004 00:22 GMT

w> It will not auto create the PTR records, [...]

That's because your ISP is making your life difficult by using RFC 2317
style delegation. Tell it to stop making your life difficult.

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/avoid-rfc-2317-delegation.html>

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