EA6500 can't connect to cable modem (surfboard 5120)

Hi all -
I've been having a problem trying to connect my new EA6500 to my cable modem (motorola surfboard 5120; charter internet service). When I use my old router (WRT320N), I have internet connectivity and no issues. I am not using bridge mode with my ISP, just automatic DHCP config. I try to access my surfboard's config page (192.168.100.1) while on my new router and get nothing, even though the lights are on and flashing on both the router and modem. No matter what I have tried, i cannot get an IP from my modem.
I have manually updated to the latest firmware (1.1.28.147876) and tried the following suggestions from the forums and internet:
- disabled IPv6
- cloned PC and old router MAC addresses (cloning is DISABLED on my old, working router)
- multiple power cycles and resets on both pieces of equipment
- changed my network to 192.168.100.x to see if I could hit my modem; when pinging surfboard's config page (192.168.100.1) i just got destination host unreachable.
Is it possible that my modem is not compatible? I didn't think it would matter, but its the only thing I can come up with. The settings on both routers are, as far as I can tell, the same. Any ideas?
Thanks in advance!

Do check if the router’s internet port has a light on when connected to your modem’s Ethernet port. It is possible that the router’s internet port is busted. Try to connect a known working Ethernet cable from one of the router’s port to its internet port and see if both ports are on. I do not really see this as a compatibility issue between the router and the modem but possible that it is a hardware problem with the router.  

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