Security Incidents mailing list archives

Re: DHCP or Probe?


From: "Clint Bodungen" <clint () secureconsulting com>
Date: Fri, 12 Mar 2004 11:59:59 -0600

Friday, March 12, 2004 10:52 AM
Subject: Re: DHCP or Probe?


I just wanted to respond as no one else has... perhaps it's just me and my
somewhat limited understanding of cable network architecture, but if this
is the cable modem renewing it's DHCP, it should not be sending the DHCP
requests to the public IP on this user's computer.

From what has been posted so far, it seems that this is a
misconfiguration, but it is an interesting one. Anyone else have ideas?


My only assumption is this, and someone correct me if I'm wrong:  the modem
receives the DHCP packet and passes it on to my router.  My router sees the
original IP address of the 10. gateway/DHCP server because the cable modem
is basically acting like a router with an unnumbered interface.



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