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| Subject: | Re: [Snort-sigs] DHCP Attack |
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| Date: | Thu, 19 Aug 2004 22:56:55 -0500 |
On Thu, 2004-08-19 at 14:30, Nick Hatch wrote:
Where do you have your Snort sensor for this rule? There are quite a few tools to find Rogue DHCP servers, but our problem has been finding a graceful solution to mitigate the amount of hardware needed to watch 30 subnets.
How about setting up a script on a box whose segment is monitored by Snort. That script can fire a dummy "whos-my-dhcp-server-daddy" broadcast query packet to 255.255.255.255 port 67 and see what machines respond (server:67 to client:68... iirc). That way you don't need to monitor each collision domain, only your broadcast domains. In essence, you're baiting the rogue DHCP server with fake DHCP queries :) Regards, Frank
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