I think everyone missed an important detail from the initial question.
He stated he has already tried "spoofing" the MAC address. I was not
aware m0n0wall had this functionality, but assuming it does, and he is
using the MAC address from his working router, that should not be the
Jonathan Merrill wrote:
>Recently, I have discovered that Adelphia is now doing MAC authentication
>for their cable modem residential customers. This means that you have to
>tell what Adelphia what network card and MAC will be used to allow a DHCP
>lease to be given. This behavior also happens if your IP address changes
>from a routable to a non-routable (i.e,. 192.168.x.x).
>This same scenario happened here in Ohio. How it was solved was by calling
>Adelphia Tech Support, give them your MAC, and reset the cable modem. Up
>and running in 2 minutes.
>Hope this helps.