> Snort does not do any filtering. It's an IDS that logs 
> scans.

Yes. I realize that. Jochem's complaint about using TCP/IP Filtering and IP
security policies in Windows 2000 was that it didn't do stateful inspection.
My response to that, assuming that Jochem's concern was primarily that these
tools don't allow you to see what's actually being sent to the box, was that
you could use Snort for that. No, it won't actually STOP any traffic.
However, if you've properly configured your bastion host, this may not be a
significant concern. After all, if you've got a server which only allows
inbound traffic to ports 80, 443, and whatever your remote shell listens on,
and only allows outbound traffic to your database server, and you've
installed an input filter on your web server, do you really need host-based
stateful inspection other than for reporting purposes?

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
voice: (202) 797-5496
fax: (202) 797-5444
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