Can't connect DD-WRT Router to Comcast

[Jim]

  On 09/13/2010 01:32 PM, Terry Polzin wrote:
> On Mon, 2010-09-13 at 13:19 -0400, Jim wrote:
>> FC13 / KDE-4
>>
>> I cannot get a Linksys WRT54G with DD-WRT  or a Linksys WRT160N to
>> connect to a Arris TM602G/CT Modem.
>>
>> 1. I have called Comcast and they swear that the connection is not
>> registered to my PC MAC address.
>>
>> 2. I cloned the PC mac address in my DD-WRT/Router.
>>
>> 3. I have pulled the battery out of the Cable Modem , reset,
>> disconnected power cord and ethernet cable and wait 1 minute before
>> plugging modem back in.
>>       And put in ethernet cable and powered modem back up.
>>
>> 4. I then powered up the Router and reset it and I get no WAN IP
>> addresses in router.
>>       PC connects to router and I can login to router and check settings,
>> No WAN Ip's in router.
>>       I also Cloned the PC Mac address in Router .
>>
>> 5. I know for sure that the WRT54G is working because I have already had
>> it connect to this Modem, but I had to move everything to a different room.
>>
>> 6. I know the Ethernet Cable is okay because, I can remove it from
>> router and plug it directly into PC, and reboot PC and I have a Internet
>> Connection, without having to pull the power plug on Modem
>>       The ethernet cable is 25 ft. long because the Modem is up stairs
>> and I can't relocate it , but that should not be a problem.
> You sure you cloned the RIGHT mac?  can you get Comcast to put your real
> mac into their dhcp list? Been a while since I've set up my dd-wrt but I
> believe there is a inside and an outside mac addr.
>
Has anyone had problems with this,  
http://www.fixya.com/support/t3475982-problem_arris_comcast_cable_modem