EA4500 Internet Port Cycles On and Off Every Few Second

Question

I bought a EA4500 to replace my old WRT54G earlier this year.  At first the router worked fine.  After the automatic firmware upgrade to Cisco Connect Cloud, I was never able to get the Connect Cloud stuff to work, constant 500 Internal Server errors when trying to access the router with the Internet cable attached.  So I downgraded back to the old firmware and all was well again.  Then I started having problems a few months ago, when I would wake up in the morning, the router would be cycling the Internet port on and off.  I could usually reboot everything and it would work the rest of the day.  I lived with it like this a while, and support couldn't seem to find anything wrong.  Eventually it started getting worse, until the point I could hardly ever get it to stay connected.  I got Cisco to RA the old router and I figured problem solved.   Now while the EA4500 was gone, I used my WRT54G again, and everything worked fine for nearly two weeks while I was waiting on the replacement EA4500.
So today the new EA4500 showed up, I connected and configured it, and it worked for a short time.  Then suddenly I lost Internet, looked up at the modem and the LAN light was going on and off every few seconds.  So I'm back in the same boat as before.
I've tried changing cables, same setup works fine with the WRT54G.  Modem works fine with WRT54G and connected directly to the computer, zero problems.  I tried lowering the MTU, turning on MAC address cloning, and various other things.
My modem is a HughesNet HN9000.
Any suggestions or ideas would be greatly apprecaited.
David

Answer 1

OK, the setup as is works fine with the WRT54G, just the EA4500 has the issue.  It started working again last night, and was working this morning.  It continued to work until about 3:15 PM today, and out of the blue, my computer came up and said the Ethernet connection went off, then it came back on, it did this several times...at the same time, I looked up at the modem, and the LAN light was going on and off on it also.  So the router was cycling both the Internet and Port 1 on and off.
My HN9000 has a static public IP, and the IP it's DHCP server gives out is one digit different than it's own IP.
My router is set this way, and this is what it gets if I switch the Internet to Automatic (DHCP):
IPv4 Address: 97.xxx.xxx.194
Subnet Mask: 255.255.255.252
Default Gateway:  97.xxx.xxx.193
Then there are two DNS server addresses.  I've tried the router setup as Static IP or Automatic (DHCP) and the problem occurs either way.
The HN9000 seems to pass all incoming traffic straight to the router.
One the LAN side, the router is configured to give out IP's in the 192.168.1.x range, and I have some static leases set.  The router is 192.168.1.1.
Everything works with the computer connected directly to the modem, and with the WRT54G in place of the EA4500.
As far as calling Hughes, they won't support the router.  If it works without the router, and with another router, they will say it's a problem with the router, which I think it is, just not sure what.  Also, just to be clear, I do loose Internet access on my computer when the router acts up, but the HughesNet modem remains connected to the Internet.