[63078] in North American Network Operators' Group
RE: Detecting a non-existent domain
daemon@ATHENA.MIT.EDU (alex@yuriev.com)
Fri Sep 26 12:08:05 2003
Date: Fri, 26 Sep 2003 12:22:06 -0400 (EDT)
From: alex@yuriev.com
To: Kee Hinckley <nazgul@somewhere.com>
Cc: David Schwartz <davids@webmaster.com>, nanog@merit.edu
In-Reply-To: <p06100225bb968c56e4c9@[192.168.1.104]>
Errors-To: owner-nanog-outgoing@merit.edu
> The answer so far seems to be to query *.TLD, nab all the records,
> and then compare them all the results you get back from querying the
> domain. If there is anything that doesn't match, you are in the
> clear. (Modulo internal networks and localhost and all those fun
> tricks of course--but that's a different problem.)
>
> The fact that this is a single IP comparison with Verisign today
> presumably does not preclude the wonders of MX records, CNAME's,
> multiple A records and all of that in the future.
Alg 101
1. Seed the isWildCard[] probability array.
Generate N random strings. Attach ".NET" or ".COM" to them. Get records for
them. Compare records to each other assigning them probability of being a
wildcard based on the repetitiveness of the data.
2. Query domain name in question.
Compare the result with isWildCard[] probability array.
Alex
