Re: UDP packet handling weird behaviour of various operating systems

[Pavlos Parissis <p_pavlos () otenet gr>]

When the time was Tue, 24 Jul 2001 23:36:39 +0300, Stefan Laudat wrote....

Hi Stefan,
 
 Stefan->I would like to hear some other results for other operating systems.
I did some test in my home network.

Info of PC A
CPU : AMD 700
etho: RealTek RTL8139 Fast Ethernet at 0xd8800000, 00:50:bf:4a:bb:7d, IRQ 9
eth0:  Identified 8139 chip type 'RTL-8139C'
RAM :393 MB
Kernel 2.4.7
ip:192.168.100.1

info of PC B
cpu : P133
eth0 RealTEK RTL 8139
RAM : 32 MB
kernel: 2.2.19
ip:192.168.100.2

No hub just cross link.

ON pc A
./a.out 127.0.0.1 cc
CPU 100% USAGE not slowdown
./a.out 192.168.100.2  cc
CPU 100% USAGE not slowdown
on pc B CPU USAGE was the same before the attack

ON pc B now
./a.out 192.168.100.1  cc
CPU 96% USAGE not slowdown,but i don'n use X on these machine i could not run same havy apps.
CPU 100 USAGE On pc A and slowdown i run it only for 25 secs because i couldn't even move the mouse!

Now, if i stop firewall and return to the default state and try from pc B do tha attack the pc A i
got
recvfrom:Connection refused!!!!!!!!!!!!!!
WHen i mean i stopped the firewall i mean that i had flush all rules and default policy is ACCEPT
for
all tables
but pc A can attack to pc B
THe firewall running on pc A.

Thanks in advance,
Pavlos


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I love having the feeling of being in control
while i have the sensation of speed

The surfer of life
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