Bugtraq mailing list archives
RE: UDP packet handling weird behaviour of various operating systems
From: Boyan Krosnov <bkrosnov () yahoo com>
Date: Fri, 27 Jul 2001 02:06:53 -0700 (PDT)
From: Stefan
Laudat[mailto:stefan () mail allianztiriac ro]
7. Cisco IOS - tested on Cisco 7513 (12.1(4)E, DCEF enabled),
Cisco
2621 (12.2.1), Cisco Catalyst 35xxXL (12.0.5.2.XU and 12.0.5.1.XP).
I'm
walking here on Linux-behaviour land. The CPU is burning at high load averages from
the start
and I get no control over it. I can get the result either directly
attacking the
router, either forwarding for a host behind it. IOS plays the brave guy and
gets it for
anyone else too.
A single 100Mbps half duplex ethernet link may reach as much as 150000 pps with tiny datagrams, which is far beyond 2621's forwarding perfomance and comparable to 7513's with VIP4-80, RSP8. Not to mention packets addressed to the routers, which will probably get handled by the RSP IOS on 75xx. This may be the reason for those routers dying. Of course, opinions expressed are my own and not of my company, nor Cisco Systems. I can easily be wrong on this. I'm just reading the docs. BR, --- CCNP Boyan Krosnov Networking Consultant Lirex BG Ltd. __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/
Current thread:
- Re: UDP packet handling weird behaviour of various operating systems, (continued)
- Re: UDP packet handling weird behaviour of various operating systems Paul Sack (Jul 26)
- Re: UDP packet handling weird behaviour of various operating systems Stefan Laudat (Jul 26)
- Re: UDP packet handling weird behaviour of various operating systems Sean Hunter (Jul 27)
- Re: UDP packet handling weird behaviour of various operating systems Sean Hunter (Jul 28)
- Re: UDP packet handling weird behaviour of various operating systems Adrian Chadd (Jul 27)
- Re: UDP packet handling weird behaviour of various operating systems Jarno Huuskonen (Jul 27)
- solaris in.lpd patch where/when? Jake Luck (Jul 28)
- Re: UDP packet handling weird behaviour of various operating systems Stefan Laudat (Jul 26)
- Re: UDP packet handling weird behaviour of various operating systems Paul Sack (Jul 26)
- Re: UDP packet handling weird behaviour of various operating systems Keith Warno (Jul 28)