Code recommendaion?

[Lance Spitzner <spitzner () dimension net>]

Any recommendations on code that will let me build
my own packets?  Specifically TCP SYN only packets
with various flag settings.

'Statefull Inspection' is becoming a common standard
in the Firewall industry.  I want to test/verify what
types of packets are added to a stateful table and
when.

Any recommendations would be greatly appreciated.  The
simpler the code the better (so I can hack it myself :)

Thanks

Lance Spitzner
http://www.enteract.com/~lspitz/papers.html
Internetworking & Security Engineer
Dimension Enterprises Inc