Debugging DHCP

Geschrieben von Jens Brey am Mittwoch, 9. April 2008 in Computer

Some days ago, i had a fight with the DHCP server in or company. I had the problem, that the Cisco IP Phones needs the option 150 set. So i look around in the internet and found some tips, how i can add this option to the ISC DHCP server. But then i was looking for a tool to check the generated DHCP requests and i found DHCPDUMP.

DHCPDUMP is a parser, which parses and show the output from tcpdump. After you have installed dhcpdump, you can use it with the following command:
tcpdump -lenx -s 1500 port bootps or port bootpc | dhcpdump

I wrote also a short patch, to add the capability to parse option 150. You can also find a complete patched version.

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