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Problem with Comcast Internet: Ubee Modem and Linksys Router

Posted on 2010-09-18
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Last Modified: 2012-05-10
I just got Comcast internet. FiOS is better but Apartments don't have it yet...plus 30/month for internet up to 20Mbps is damn good deal.

Ok so here's the rundown...
-Comcast service just hooked up and activated to my purchased Ubee modem (free via rebate)
-Did the Comcast service setup using my laptop directly connected to modem.
-hooked up perfect in ~10 mins. Speedtest showed 21Mbps down/5Mbps up
-Connected to Linksys WRT54GL (internet port on WRT54GL to ethernet on modem) and browsed to the "Status" page to see that the Comcast WAN IP information shows up properly.
---Only weird thing is that the internet port on the WRT54GL flashes 100% constantly
---The above makes me so confused as to why it wont work now.


So, after getting all of this set up the way I always have, it will not go out to the internet when connected through the router. So, I reconnect the modem directly back to my laptop (bypassing the router) and it goes right to any webpage. (the WAN IP i saw in the WRT54GL page now shows up as my IP under network preferences on my laptop.) I started to think that the direct connection setup caused my MAC address of my laptop network card to be bound to the modem for whatever reasons. Here is what I tried;

-Cloned the MAC from my laptop (used to initiate the modem with comcast) to the Linksys WRT54GL.
---waited some time and rebooted the router. nothing. waited some time and rebooted the modem. waited some time and rebooted both...letting the modem come up 100% first...then connecting the router up. Nothing again. It still shows that I have a comcast WAN IP on my router so I have no idea why this happened. Also, I reset the router back to defaults a few times to clear it out for every possible fix that I came up with.


Now, why in the heck can I not get out to the internet through a router? boggles my mind.

--edit-- also I have tried to change the IP on the router to 192.168.2.1 instead of 1.1 because I googled around and thought it may be a problem.
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Question by:Justin_Edmands
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by:R. Andrew Koffron
ID: 33708841
unclone the MAC. turn everything off unplug the cable modem, pull the battery if there's phone stuff in it. wait 2-3 minutes, turn on the modem, turn on the router, turn on the computer.
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by:Justin_Edmands
ID: 33709041
hey, thanks for the response. still back to square one after trying that stuff. even unplugged the coax as other sites recommend.
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Expert Comment

by:R. Andrew Koffron
ID: 33709315
first off the cable modem works with laptop plugged straight into it?

if yes power it down(pull battery if there is one), wait 2 minutes fire it back up.

take you router, not hooked to router, and do a factory reset. blank it out, and fire it up.

hook your machine laptop or desktop up with an ethernet cable, and run the setup for the router,
do not change ANYTHING till it's workking, you can always improve security after the thing is set up.

set the WAN/Internet to be Obtain automatically -> DHPC
leave everything else default, save, reboot router, and hook it to the cable modem.

once it reboots you should be able to get the internet through the cables.

THAN change wireless and IPs as you see fit to improve secuirty.
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Justin_Edmands earned 0 total points
ID: 33709535
bad router. hmm. i may try to convert it to DD-WRT in hopes of fixing the problem.
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