[ale] DirecTV DSL - No Reverse DNS

[Paul D. Manno]

John and ALErs,

Jerry is correct about RARP - it's not related to DNS issues.  You are 
also correct in believing you can still run servers with no reverse-DNS 
on your connection.  Your connection as a no-reverse-DNS client is indeed 
trouble for many sites that verify.  That said...

Depending upon what you're really serving, some server applications may 
require the ability to do a reverse lookup on their own IP before they 
serve.  One can argue if that's reasonable but such falls outside this 
discussion.  In addition, some clients may be picky about the server they 
communicate with and require a valid IP -> DNS name lookup to verify the 
server's credentials.

So... YMMV.

-- Paul

On Mon, 28 Jan 2002, John Mills wrote:

> Jerry -
> 
> Thanks for clearing that up, but I'm not sure how it affects the other
> reader's comment that inability to do reverse lookup would prevent them
> from running a server. I have certainly seen the reverse case: servers
> which will not respond to me as a client for which [I've assumed] they
> cannot to a reverse lookup.
> 
> On Mon, 28 Jan 2002, Jerry Z. Yu wrote:
> 
> > 	reverse DNS lookup (IP -> DNS name) has nothing to do with RARP
> > (which is mac->IP)
> > 	If the ftp server (or any server for the matter) trying to do
> > reverse DNS lookup before allowing further client connection, valid
> > request whose source IP can't be resolved to a valid DNS name, the server
> > time out the lookup eventually and allow the client to continue anyway.
> > However, your client program may time out before that. Another thing would
> > be the ident lookup.
>  
> > #On Sun, 27 Jan 2002, Paul D. Manno wrote:
> 
> > #> I checked my connection about a minute ago and the Telocity/DirectTV DSL
> > #> connection has a valid DNS reverse map just as it always has.
> 
> How does one check? I used 'whois <my_IP>' with no match.
> 
> Thanks.
> 
>  - John Mills
> 
> 
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