[3580] in bugtraq
Re: BoS: Someone reminded me of something today ;)
daemon@ATHENA.MIT.EDU (Rick Weldon)
Thu Oct 31 05:46:53 1996
Date: Wed, 30 Oct 1996 22:10:38 -0500
Reply-To: Rick Weldon <rick@wisetech.com>
From: Rick Weldon <rick@wisetech.com>
X-To: Alan Cox <coxa@eris.private.cableol.net>
To: Multiple recipients of list BUGTRAQ <BUGTRAQ@NETSPACE.ORG>
In-Reply-To: <199610301144.LAA05072@eris.private.cableol.net>
On Wed, 30 Oct 1996, Alan Cox wrote:
> Now that various people have put bits of info in the public domain[1]
> so nobody
> at 3com can claim I'm breaking confidences, I'd like to invite the
> entire
> world to try sending IP data with 0 length options (IP or TCP) to the
> management port of all their 3com routers and kit, especially the little
> routers, bridges and managed hubs.
>
> Have fun
>
> Alan
> [1] Like the ip_send documentation.
>
>
They will of course barf depending on which rev of the software is on the
device. I have run into this with older equipment, especially comm
servers like the CS2600. I never thought of it as breaking a confidence
to say that if you turn IP options on and try to talk through a 2600 it
will spontaneously reboot or hang. I thought this was a well know problem.
From the FreeBSD /etc/sysconfig file:
#
# Some broken implementations can't handle the RFC 1323 and RFC 1644
# TCP options. If TCP connections randomly hang, try disabling this,
# and bug the vendor of the losing equipment.
#
tcp_extensions=NO
I suspect that more than just the comm servers suffer from this problem,
although I don't know which ones.
Rick
| Rick Weldon -- WISE-Tech LLC
| E-mail: rick@wisetech.com
