Changing the DHCP address of a machine on my Local LAN

[Bruno Wolff III]

On Sat, Mar 06, 2010 at 18:31:32 -0500,
  Sam Varshavchik <mrsam at courier-mta.com> wrote:
> 
> DHCP requests are, by definition, sent to the local link broadcast
> address, and can only be received by DHCP servers on the same
> network segment. DHCP requests cannot cross a router or hop to a
> different network segment. A DHCP server is always required to be on
> the same network segment as its clients, in order to receive DHCP
> requests and manage the clients.

Cheapo routers are often set up as bridges. So it could be that his ISP
supplied device and his device are both seeing the dhcp packets.