Have a look at http://freshmeat.net/proje
It can check to see which clients on a lan have their network adapters set to promiscuous mode, ie those that may be sniffing
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Tool to find the sniffer in subnet
I want to find any one using sniffer in my network. Is there any open source tool available?.
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by: jimmypwPosted on 2009-10-05 at 21:53:45ID: 25501976
Hi,
Your question depends on how sophisticated the suspected hacker is, I'll go through a few scenario's.
1)
S. The hacker is using a packet dumping tool such as ethereal or tcpdump.
A. There isn't anything you can do to prevent this particularly if they have their own kit. If you are using switch they can only see their own traffic and broadcasts. Consider a security switch that monitors MAC address changes.
2)
S. The hacker has physical access to a sensitive machine / networking equipment.
A. Physical access should always be restricted. If you are in control of this you can log and supervise users you are well within your right.
3)
S. A tool is being used to poison ARP tables of machines to redirect traffic.
A. This kind of attack is by far the most flexible from the perspective of the hacker but also the noisiest and easily detectable (arp responses with no requests). From here there are 2 routes either write your own script to monitor arp -an and scan for changes or (i believe) there is a module for snort.