Firewalls: Re: Cheap NT and DOS Firewalls

Firewalls
(May 1996)

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Subject:	Re: Cheap NT and DOS Firewalls
From:	peter @ baileynm . com (Peter da Silva)
Date:	Tue, 28 May 1996 10:40:17 -0500 (CDT)
To:	avalon @ coombs . anu . edu . au (Darren Reed)
Cc:	peter @ baileynm . com, Firewalls @ GreatCircle . COM
In-reply-to:	<199605281440 . JAA11076 @ web . nmti . com> from "Darren Reed" at May 29, 96 00:35:04 am

> > > > And I don't know any packet filter solution that can stop stealth scanning.

> All that needs to happen for this to come into effect is expanding the fields
> used in packet filtering to include ack/seq numbers plus window size.

Wouldn't you need to retain state about the ack/seq numbers to do this
meaningfully?

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