Great Circle Associates Firewalls
(March 1996)
 

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Subject: Filtering on IP options -- ?
From: "Andrew V. Stesin" <stesin @ elvisti . kiev . ua>
Date: Fri, 22 Mar 1996 19:45:04 +0200 (EET)
To: firewalls @ greatcircle . com

Dear filtering gurus,

Q.1:
suppose that due to resource shortage I'm going to combine
the functionality of internal filtering router and bastion host
in a single FreeBSD box, which has _both_ input and output
packet filtering facilities.  (See C&B p.69, fig.3.11)
Is that considered to be evil?

Q.2:
where can I get a _detailed_ explanation of what is the
recommended strategy of packet filtering depending on IP options?
What IP options are considered harmful and why?

(Electronic resourses are preferred: I have no access to books
other than C&B 1st ed., sorry :(  )

Thanks!

-- 

	With best regards -- Andrew Stesin.

	+380 (44) 2760188	+380 (44) 2713457	+380 (44) 2713560

	"You may delegate authority, but not responsibility."
					Frank's Management Rule #1.

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