PS3 error: "An Ethernet cable is not connected" with E2000

Question

Problem: My PS3 displays An Ethernet cable is not connected almost immediately after logging in. I am connected through a Linksys E2000 router.  If I reset the cable modem, it will work for 10-15 minutes until it errors out again.  If I plug the PS3 directly into the cable modem, it works fine. I'm really confused.
1. I do not believe it is the router, as my computer is also connected to the router, and works fine. My Touchpad is connected wirelessly and also works fine.
2. I do not believe it is the PS3, because it works fine if I plug it directly into the cable modem. I tried switching to wireless and it finds a lot of other signals (including mine), but I have the same problem if I choose wireless.
I first had this problem with a launch PS3 and a Netgear router after almost three years of no problems. This was back in November 2010.  I replaced it with a Linksys E2000 router in January 2011, and a slim PS3 in late September 2011.
I had no problems from January until last weekend.  I have tried to do the DMZ trick, but no luck. I have also tried to set the primary and secondary DNS to 4.2.2.1.
Does anyone have any insight? If I need to buy a new router, I will, but I don't understand because it works for my computer and Touchpad.  Is it something crazy like when November comes, my internet settings get corrupted?

Answer 1

Try using the DHCP reservation feature to give your PS3 a "static " ip outside of the DHCP server range. So something above the range called "IP Address Range". 192.168.1.150 should be good, but you can check to confirm that this address isn't in that range. 
Make sure your PS3 is set to obtain the network information automatically, NOT through a custom setting. Also, make sure your PS3 is turned off completely before doing this. 
Could you also give us a screenshot of the "signals" tab when you go to 192.168.100.1?
I don't work for Cisco. I'm just here to help.