Cisco E1000 wont connect to internet anymore - not getting DHCP ip address from Comcast modem

Very strange issue...
I have Comcast HSI and have been using my Cisco (Linksys) E1000 for about 3 years now. Bought it as a refurb.
My issue is that the E1000 is NOT receiving the DHCP info from my Comast modem.
The internet works when my laptop is directly attached to the modem; but when connecting the modem internet port
to the E1000 internet port it is NOT grabbing my ISP DHCP ip address thus no clients can broswe 'wired or wireless'.
I even updated the firmware and am starting to think its time to get a 'BRAND NEW' router as this makes NO SENSE!
I cannot release/renew as i have NO ip address to release.  I have even tried to configure the E1000 as a static 
using the ipconfig/all from when the laptop and modem was connected. Comcast says they see nothing on their end. 
I also factory defaulted the router and redid the config to no avail. 
Any help would be appreciated.
Solved!
Go to Solution.

You need to enable MAC address clone on the router to recognize the connection from your cable modem. The link below would tell you how to configure the router to work with a cable connection and how to do MAC address clone.
Setting up a Linksys router with Cable Internet service

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