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Re: Finding a Renegade DHCP Server



At 12:36 PM -0400 8/27/05, Tom Limoncelli wrote:
On a mac, you can do:
    ipconfig getpacket en1
look for the "server_identifier" line.

On Aug 26, 2005, at 4:16 PM, Dan Shoop wrote:


At 4:31 PM +0200 8/26/05, âern— Robert wrote:

use nmap to scan for dhcp port on affected network range.


Except that DHCP is not a TCP service and hence has no port that's open ;)

We've replaced Dan's regular cup of coffee with new Folgers Crystals with UDP support. Let's see if he notices:


# nmap -sU 10.1.240.1-2 -p 67-68

Touche' Tom!

My point of course was that DHCP is not a TCP service.

I'm also not aware that the "nmap" portscan in Network Utility has a way of testing this. It only appears to check TCP ports. So you'd need to install a real copy of nmap AND scan UDP ports, explicitly. A scan using the OS X tool or even a default run of nmap won't uncover this.
--


-dhan

------------------------------------------------------------------------
Dan Shoop                                                   AIM: iWiring
Systems & Networks Architect                     http://www.iwiring.net/
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iWiring provides systems and networks support for Mac OS X, unix, and
Open Source application technologies at affordable rates.
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References: 
 >Finding a Renegade DHCP Server (From: Jacob White <email@hidden>)
 >Re: Finding a Renegade DHCP Server (From: Dan Shoop <email@hidden>)



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