You may want to make sure the DHCP server is disabled on the modem completely. 
I’ve noticed that caused issues in the past for me.
The default user/pass is cusadmin/highspeed on those modems.


On May 10, 2014, at 2:19, Aaron C. de Bruyn <aa...@heyaaron.com> wrote:

> Yeah--I figured it was related to the MAC address.
> 
> It'd be nice to know why the Comcast equipment does that--I've never run in 
> to it with other providers.
> 
> -A
> 
> 
> On Fri, May 9, 2014 at 9:01 PM, compdoc <comp...@hotrodpc.com> wrote:
> > I called Comcast and had them remotely reboot the modem.
> 
> Whenever I connect a different network card to my home Comcast modem, I have
> to power cycle the modem for it come up. I think it keys off the MAC address
> of the old card, and won't accept the new one until then. I get a new IP
> address each time I test firewall builds. Not exactly the same situation,
> but something like.
> 
> 
> 
> 
> 
> 
> 
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