Can't connect DD-WRT Router to Comcast

[John Aldrich]

On Mon September 13 2010, 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.
>
I had to replace my router a few months back. I happen to be on DSL, so 
it's a little different. That being said, there were some changes I had to 
make to my configuration as my ISP had changed the way they did things. 
Check with Comcast to see if the connection is PPPOE or something else. 
That is a *huge* difference...if it's PPPOE and you have it configured for 
something else, it won't log in. Period.