[c-nsp] Embeded Packet Capture for DHCP Troubleshooting [SEC=UNCLASSIFIED]

Jeff Wojciechowski Jeff.Wojciechowski at midlandpaper.com
Wed Sep 22 10:19:26 EDT 2010

Thanks for the suggestion. Problem is it's a remote site and I don't have a box there (yet) that I could sniff from.

Thanks again for everyone elses help/suggestions. Will update the list when I am able to make any headway on the issue.


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Wilkinson, Alex
Sent: Wednesday, September 22, 2010 8:52 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Embeded Packet Capture for DHCP Troubleshooting [SEC=UNCLASSIFIED]

    0n Tue, Sep 21, 2010 at 05:12:10PM +0100, Heath Jones wrote:

    >Well I think your on the right track with the packet capture then.
    >It looks as if the client either never sees the dhcp proposal, or the
    >proposal itself is unacceptable to the client. (there are more
    >potential issues, but only when there is more than 1 dhcp server)
    >so for the access list:
    >access-list 100 permit udp any any eq bootps
    >access-list 100 permit udp any any eq bootpc

Else if you have a FreeBSD box handy take a look at /usr/ports/net/dhcpdump:

   This command parses the output of tcpdump to display the dhcp-packets
   for easier checking and debugging.

   WWW: http://www.mavetju.org/unix/general.php
   Author: Edwin Groothuis <edwin at mavetju.org>


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