Trouble with External Lookups

Barry Margolin barmar at
Fri Jun 9 03:49:23 UTC 2006

In article <e68bpp$1s5a$1 at>, krmdv at wrote:

> I can do everything with my IP address except get a reverse lookup off 
> of it. I can nslookup connect to the IP address and it responds.  I 

Hey, remember when I said to use "dig", not "nslookup"?

> found an article on the next that had the same error described with my 
> ISP (SBC/ATT).  I called SBC and they are putting the reverse 
> delegation in for my IP Block.  The change should take 24 to 72 hours 
> so I should hopefully be good to go.  If you can think of anything else 
> I can try, please let me know.  I havent touched DNS in a couple years 
> so things are slowly coming back.
> When I perform nslookup on my ip address outside my network I get Can't 
> find IP addy Non Existent Domain.  If I do an nslookup 
> from inside my domain I get:
> ** server can't find NXDOMAIN
> I can run nslookup then connect to the IP address so there doesnt 
> appear to be any firewalling issues.
> All of this investigation lead me to the ISP not delegating reverse DNS 
> on my IP Block.  Let me know if you any thoughts on this being 
> something else.

If it works locally but not remotely, then it's probably a delegation 
problem.  If it doesn't work locally, either, then it may be a problem 
with your configuration as well.

I'm having a hard time parsing your message to understand which of these 
it is.  I don't know what "I can do everything with my IP address except 
get a reverse lookup off of it."  What else are we discussing other than 
reverse lookups, so what is "everything"?

Barry Margolin, barmar at
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

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