WRT600N: Diagnosing Constant "Internet" Activity

I have a WRT600N connected to a Scientific Atlanta Model DPX110 cable modem and I'm seeing constant "internet" activity between my router and the cable modem.  The intenet activity light is banging like crazy on the router and the "PC/LAN" light on the cable modem is also banging like mad.  Have disabled all wrieless interfaces and disconnected every network connection from the router except that of the cable modem.  Have also cycled power on both the cable modem and router a number of times just to make sure nothing is stuck in a wierd state.  Basically, nothing I have done seems to get rid of this constant activity between the router and modem.  I'm pretty sure the activity is not coming in from the WAN side of the modem as I'm not seeing any comparable activity on the modems "Cable/WAN" activity light.  Not sure exactly when the behavior began, but I'm pretty sure this was not happening in the past.  Also upgraded to the latest WRT600N firmware to see if that helps, but it did not.  Any suggestions on how to diagnose what this traffic is between my cable modem and WRT600N short of a network sniffer?  Is there some way to make the router log this activity for me to view?  I initially assumed the activity was being caused by the router, but now am beginning to wonder if if might be the cable modem doing it...  Anyway,  any suggestions appreciated.  Thanks!

Yeah, I had considered doing that and may still do so shortly.  Was just a bit concerned with bypassing the hardware firewall in case the cable modem has somehow been compromised.  Thought there might be a way to see what the "internet" traffic is before allowing the cable modem direct access to my PC.  Paranoid, I know...
May try hooking directly to my PC shortly...  but first I believe I'll need to locate and install the original network card to which the cable service is keyed.  Haven't seen it in some time as I've long since had a Linksys cable router with MAC address spoofing in use.  Will provide updates on what I find.
Thanks for the feedback!

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