Default behaviour of IP Options processing
David Wolfskill
david at catwhisker.org
Thu May 6 12:29:28 PDT 2004
>Date: Thu, 06 May 2004 21:16:03 +0200
>From: Andre Oppermann <andre at freebsd.org>
>To: freebsd-current at freebsd.org, freebsd-net at freebsd.org
>Subject: Default behaviour of IP Options processing
>Sender: owner-freebsd-current at freebsd.org
>However I want to propose to change the default from processing options
>to ignoring options (or even stronger to reject them).
>....
>Opinions? Discussion? Yes/Nay?
>From "ipfw show" on my home gateway/NAT/packet fileter box:
...
02000 0 0 deny log ip from any to any ipopt rr
02010 0 0 deny log ip from any to any ipopt ts
02020 0 0 deny log ip from any to any ipopt ssrr
02030 0 0 deny log ip from any to any ipopt lsrr
I implemented those rules back around August, 1999, when I first set the
box up; I don't recall that they have ever been triggered. (Uptime on
the box is nowhere near 4+ years, as it's been tracking -STABLE about
every couple of weeks:
janus# uname -a
FreeBSD janus.catwhisker.org 4.10-PRERELEASE FreeBSD 4.10-PRERELEASE #66: Sun May 2 06:05:10 PDT 2004 root at freebeast.catwhisker.org:/common/S1/obj/usr/src/sys/JANUS i386
janus#
So the counters from "show ipfw" only show traffic since
janus# uptime
12:27PM up 4 days, 5:53, 1 user, load averages: 0.04, 0.03, 0.06
janus#
-- not really enough to be significant.)
My point was that there are some of us who, quite deliberately,
decline to accept options-laden traffic anyhow. So I have no known
reason to object to the proposal.
Peace,
david
--
David H. Wolfskill david at catwhisker.org
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