Firewall testing tool - name forgotten ...

Hi,

I'm looking for a firewall testing tool that runs under FreeBSD (among
others) and consists of a packet sender on one system, and a packet
listener on another system. The firewall is in between. The sender
generates traffic and the listener sees what goes through the firewall.
Then a summary of the firewall rules can be made.

I'm almost sure I read about the tool in one of R. Bejtlichs "Tao of
Network Security Monitoring" of "Extrusion detection" books, but I've gone
through them almost page by page and I can't find the reference anymore.

Anyone remembers the name of the tool? I would like to try it on a new
production firewall. Has anyone already tried it?

Greetings, Petr Kazil

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