Open source firewalls

[Vinay Venkataraghavan <raghavanvinay@yahoo.com>]

Hello,

I have implemented an bare bones Intrusion detection
system that currently detects scans like open, bouce,
half open etc and a host of other tcp scans.

I would like to develop this into a full blown IDS
which is capable of detecting buffer overflow attacks,
sql injection etc. 

I know how to implement buffer overflow attacks. But
how would an intrusion detection system detect a
buffer overflow attack. My question is at the layer
that the intrusion detection system operates, how will
it know that a particular string for exmaple is liable
to overflow a vulnerable buffer. 

Are there other open source firewall implementations
other than snort?

I would apprecitate it if you could let me know.
Thanks,
Vinay



		
__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - Find what you need with new enhanced search. 
http://info.mail.yahoo.com/mail_250
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/