Bugtraq mailing list archives
Re: BoS: Someone reminded me of something today ;)
From: rick () wisetech com (Rick Weldon)
Date: Wed, 30 Oct 1996 22:10:38 -0500
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
Current thread:
- Someone reminded me of something today ;) Alan Cox (Oct 30)
- Re: Someone reminded me of something today ;) carson () lehman com (Oct 30)
- (Another) vulnerability in new SGIs Tung-Hui Hu (Oct 30)
- Re: BoS: Someone reminded me of something today ;) Rick Weldon (Oct 30)