Is it possible to record a DHCP handshake?

From: Elias Aarnio (eliaar_at_utu.fi)
Date: 12/06/04 

Date: Mon, 06 Dec 2004 16:25:29 +0200

Hello,

It is very common among the ISP's to refuse any responsibility even if
there is a malfunction in their hardware devices. A very common problem
these days is low-end HomaPNA switches that all of the sudden stop
functioning as DHCP servers.

This causes all clients (customer's computers) behind that switch to be
  unable to use the connection. These "layman" HPNA services often also
state in the user guide that the the ISP has the right to change the IP
addresses of the default gateways etc. without prior notice.

So, when I go to help somebody with a problem like this, I would like to
"record" the DHCP handshake. This would be extremely useful when the
customer wants to get his/her money back from the ISP.

How do you record a DHCP handshake? 

-- 
EliasA

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