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Full Discussion: DHCP server discover
Special Forums IP Networking DHCP server discover Post 302573350 by otheus on Monday 14th of November 2011 07:50:17 AM
Old 11-14-2011
Mrm. A script won't help you. Something like nmap would be your tool of choice. I'm thinking this is what you want to use (run as root):
Code:
nmap -oN /tmp/dhcp-discovery.txt -sU -p 67,547 10.2.11.0/24  10.2.0.0/16

Change the portion in blue to match your subnet/bits-in-mask.

Then grep the results:
Code:
grep -B4 open /tmp/dhcp-discovery.txt

If your grep doesn't support "-B", try:
Code:
egrep "(^Interesting)|( open)" /tmp/dhcp-discovery

And you'll see output like:
Code:
Interesting ports on 10.2.11.88:
Interesting ports on 10.2.11.205:
67/udp open|filtered dhcps
Interesting ports on 10.2.11.210:
Interesting ports on 10.2.11.211:
Interesting ports on 10.2.11.212:

And the line in red is the one you're interested in.

Last edited by otheus; 11-14-2011 at 10:18 AM.. Reason: corrections, expounding on output
 

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NAME
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