Great Circle Associates Firewalls
(January 1997)
 

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Subject: Re: DNS wildcards
From: Laurie Bostic <Laurie_Bostic @ INS . COM>
Date: Tue, 21 Jan 1997 17:15:25 -0600
To: mike @ ptes . com (Mike Bernhardt)
Cc: firewalls @ greatcircle . com

At 01:00 PM 1/21/97 -0900, Mike wrote:
>Putting in the reverse wildcard entry solved the immediate problem. So my
>question now is, does an ftp server configured as Daniel describes compare
>the forward and reverse lookups to see if they're the same, or does it just
>look for a positive response in both directions? If they must be the same,
>obviously Mike Jones's forward wildcard entry won't work. I don't know of a
>"double-lookup" server to test this with, and I don't want someone to run
>into one at a bad time...

AFAIK, servers configured in this way look only for a positive response on
the reverse lookup.  FTP.UU.NET checks for reverse lookups...it's extremely
busy during prime time, though.

Just $.02 more,
Laurie

 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Laurie Bostic                     E-Mail : <mailto:laurie_bostic @
 ins .
 com>
 INS Dallas                        Pager  : 1-888-897-2430
 http://www.ins.com                V-Mail : (214) 392-3545 x176
		Bad spellers of the world, untie!
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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