Security Incidents mailing list archives

Re: streams of fragments...


From: Dug Song <dugsong () monkey org>
Date: Wed, 18 Jul 2001 14:51:52 -0400

On Wed, Jul 18, 2001 at 01:10:14PM -0400, Jose Nazario wrote:

a lot of sites block fragments to no great loss of theirs. in this
day and age it's usually not needed.

this really depends on your site's normal traffic, and whether you've
actually measured enough of it to make a reasonable decision:

        http://www.caida.org/outreach/papers/pam2001/fragmentation.xml

there are better ways to handle fragments at a security gateway than
just to drop them - see the OpenBSD packet filter's IP normalization
code for details.

-d.

---
http://www.monkey.org/~dugsong/


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