how to detect failing open connection attempts

[jrhendri () maine rr com]

Hi,
  It seems like something that could be done, but I'm not real sure how.

What I want is to do alerting (or logging) of connection attempts that receive an inbound SYN (to a specific host or 
network) but no SYN/ACK is ever sent back. 

I simply don't know enough about how snort handles flow or connection "tables" to see an easy way to do this.

I've even thought about a *very* crude combination of tcpdump and a perl script to enter SYNs into a connection table, 
then delete them after a SYN/ACK is seen, and alerting on ones that never complete using alarm(), but I know there must 
be a better way...

Any ideas?

Thanks!
Jim Hendrick




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