North American Network Operators Group

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  • From: Steve Bellovin
  • Date: Tue Jan 15 17:23:16 2002

Quite a number of people have been asking me about ipsrvtrace.  It's a 
tool I wrote a few months ago, to investigate a service-specific black 
hole.  (Packets to one net to port 80 didn't get through; packets to 
other ports or other nets did, and the network manager insisted that 
there were no firewalls or transparent proxies in the way.)

Anyway -- the code is not (yet) released.  It runs on NetBSD, FreeBSD, 
and OpenBSD; a variant runs on Linux, but I haven't folded the Linux 
changes back into the base version yet.  If you need that sort of 
functionality today, use tcptraceroute, which you can find at

		--Steve Bellovin,
		Full text of "Firewalls" book now at