ATTBI refuses to do reverse DNS?

Tue Jun 18 18:51:16 UTC 2002

At 02:30 PM 6/18/02, Lou Katz wrote:

>A client of mine just discovered that he could no longer do ftp
>transfers to my machine. His IP address had changed to one in
>12.240.20 and there is no reverse DNS for that block. His
>previous assignment was in a totally different block which did
>have reverse DNS. Calls to ATTBI got the answer that they
>are not obligated to provide reverse DNS and have no plans to
>do so. My servers refuse connections when there is no reverse
>lookup.

Your server is using this INADDR lookup for what purpose? Security?

INADDR is a really good idea for network operators to be using, and a 
really BAD idea for server operators to use as a security mechanism. Fix 
your server to be less anal.

read draft-ietf-dnsop-inaddr-required-03.txt from your favorite Internet 
Drafts archive for additional information on this subject.

>Is this common?

I have a CDPD card which has a fixed address. It's from Verizon Wireless. 
There's no INADDR. There seems to be a lack of understanding and clue all 
around on INADDR, which is the motivation for the above-mentioned draft. 
Having something to point network operators and server operators to would, 
IMO, help.

>--
>I suppose I could set up a bogus reverse for him, but, feh...

Either you set up something, or you can make your server not care about 
reverse, or lose the customer.

-----------------------------------------------------------------
Daniel Senie                                        dts at senie.com
Amaranth Networks Inc.                    http://www.amaranth.com