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Old 04-07-2005, 01:48 AM   #1
Registered: Apr 2003
Location: Sydney
Distribution: Gentoo
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packet filtering

hi guys,

I admin a LAN every few months with about 200 ppl attending. Ofcourse the guys that come bring the blaster worm & varients with them.

Is it possible to setup some kind of packet filtering so that we can find who is broadcasting so that we can shut them down? I was thinkin along the lines of ethereal or something.

thanx in advance

Old 04-07-2005, 03:18 AM   #2
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Registered: Mar 2003
Distribution: Fedora
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An IDS like snort or snort-inline is probably a good way to do it, especially if you want to have updateable signatures rather than just static rules. Ethereal will show you real-time captures, but unless you can identify malware by looking at raw packet payloads, then it likely won't be as effective.
Old 04-09-2005, 01:34 AM   #3
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Registered: Jan 2005
Location: Unix planet
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Talking HI

if u r using the iptables as firewall command and router then u can find from the following

use tail -f /var/log/message

this command will show all the continiou packets that has been generated by.

find out which source is generating the broad cast packets. and catch it for further filtering/investigation.


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