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Help with capturing network packet

Posted on 2004-03-30
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Last Modified: 2010-03-18
I run a priviledged BNC service (for IRC) and I would like to monitor the contents of my users. For example, I was sent an email by the IRC network asking for evidence in which a user of my BNC service has spammed in the network. I have heard there is a command called 'tcpdump' which is able to listen and log all network data coming to and from any interface. I have tried it and it logs mostly garbage packets which I do not require and uses up a lot of disk space. I would like to know the command to listen to only certain keywords of phrases and log THAT data in, if possible, and if not then what software out there could I use for this purpose?
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Question by:rudyzainal
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8 Comments
 
LVL 18

Expert Comment

by:liddler
ID: 10712477
tcpdump has lots of option for narrowing the output down, you can then pipe the output via egrep to match it against certain keywords, before writing it to a file, this should reduce the disk space, and get rid of lots of the rubbish. take a look at the tcpdump manpage.
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Alf666 earned 50 total points
ID: 10712499
tcpdump is a network diagnostic tool. It will not log packets content (per design).

For a diagnostic, you can use ethereal or tethereal (the terminal version).

But for doing exactly what you want, you'll have to look inside the hackers section.
It's very bad practise to sniff your users emails or irc sessions.
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Expert Comment

by:givetoprakash
ID: 10712596
There is some programs to capture the packets & it contents .

if you want that programs contact me
<email address removed by sirbounty>

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LVL 17

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by:owensleftfoot
ID: 10712703
ngrep http://ngrep.sourceforge.net/ is a program like ordinary grep for searching for regular expressions/phrases but ngrep works on network packets instead of files.
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Expert Comment

by:pablouruguay
ID: 10713060
sniffit or ethereal...

have a gui interfaces to discrimine garbage packets
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Author Comment

by:rudyzainal
ID: 10717236
liddler
I have read the MAN page but the options are way too vast for me to actually pinpoint for the results i wanted.

Alf666
It IS bad practice, but before they acually are given a bouncer they have to agree on the policies set which state that all communications to and from the server will be assessed and logged as and when necessary, as in this case whereby this certain user has been accused of breaching. I cannot terminate this user's account due to flamboyant accusations without any proof and as such he was put in (and duely notified of) what's called 'monitor accounts', in which i need this information from here. :)

givetoprakash : your email was removed. You might wish to get in touch with me via email. My email is posted on my profile.

owensleftfoot
thanks ill take a look at it

pablouruguay
my box is not local, its located on a datacenter, and as such GUI isnt that much of an option.
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LVL 18

Expert Comment

by:liddler
ID: 10721018
As Alf666 says ethereal is an excellent tool, hava a look at that
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