Good point. Nslookup is an DNS client that sends UDP queries. Then it is UDP 
String or a Fixed UDP engine. The latter supports more options to specify regex

From: Karthik sagar [mailto:[email protected]]
Sent: 27 February 2012 21:53
To: Eugene Pefti
Cc: schilling; ccie security
Subject: Re: [OSL | CCIE_Security] IPS Question

nslookup is an UDP operation on windows machines. String TCP engine would not 
be applicable, right?
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