Bugtraq mailing list archives
Re: UDP packet handling weird behaviour of various operating systems
From: Stefan Laudat <stefan () mail allianztiriac ro>
Date: Thu, 26 Jul 2001 01:59:59 +0300
Most UDP packets should be firewalled from the Internet.
Agree.
This is only really useful if someone has access to the local network. Is Linux/UP actually *locking* or just temporarily unresponsive? Also, it is invalid to compare Windows ME running on $3000 hardware with Linux/*BSD running on an old Pentium. Are you running all of this on the same hardware? Obviously faster hardware is going to be affected less by a UDP flood. How about the network cards?
Identical network cards for Win2k, Linux SMP and OpemBSD processor (Intel Pro 100). Linux was run on dual p3/1Ghz(SMP), Pentium2/400Mhz and P3/800Mhz (UP). Windows 2000 was run on p3/1Ghz UP. I've made tests with same results against Linux UP boxes running on Celeron/600 with 3com Vortex and realtek 8139 NICs. I've outlined that the result is the same no matter if you hit via 1Gbit or 100Mbit.
I am suspicious that you are just comparing hardware, given that different versions of W2K perform much differently in your analysis. (You said the load was server: 35%, professional: 60%) I somehow doubt that MS tuned the network stack so much on the ``server'' version & wouldn't do the same on the ``professional'' version.
Some of the Linux servers have just the same configuration with the w2k servers. The reaction IS different. That's what amazes me. Also WinME was run on a cheap p2/350 box with an old intel NIC. No slowdown at all :(
I bet a Sun E10K with lots of NICs could flood the Sun UE3500 with lots of NICs, but that probably doesn't mean that the Solaris 8 network stack is better than the Solaris 8 network stack; it's because the E10K is faster.
well then someone will clear all this stuff for me. -- Stefan Laudat CCNA,CCAI Senior Network Engineer Allianz-Tiriac SA "Let's call it an accidental feature." -- Larry Wall
Current thread:
- Re: UDP packet handling weird behaviour of various operating systems, (continued)
- Re: UDP packet handling weird behaviour of various operating systems Cade Cairns (Jul 27)
- Re: UDP packet handling weird behaviour of various operating systems aland (Jul 27)
- Re: UDP packet handling weird behaviour of various operating systems Stefan Laudat (Jul 26)
- Re: UDP packet handling weird behaviour of various operating systems Michal Zalewski (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 Niels Bakker (Jul 27)
- RE: UDP packet handling weird behaviour of various operating systems David LeBlanc (Jul 26)
- Re: UDP packet handling weird behaviour of various operating systems Radu-Adrian Feurdean (Jul 27)
- Re: UDP packet handling weird behaviour of various operating systems trop (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 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 Keith Warno (Jul 28)