On Sat, Mar 06, 2010 at 18:31:32 -0500,
Sam Varshavchik <mrsam(a)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.