Suddenly Linksys routers cannot connect to internet - cable modem works fine!

[rgrubin]

I have been a Vonage customer for over 10 months and use the WRTP54G
phone adapter/router. Today, all of a sudden, I can no longer connect
to the internet wirelessly via my laptop OR from the PC where I have an
ethernet cable plugged into a port on the router.

I called Vonage and they said it seemed defective and are shipping me a
new router.

HOWEVER, I tried plugging in my old Linksys BEFW11S4 wireless router
and I have the same connectivity problems.

If I connect the PC directly to the cable modem I can access the
internet fine, but not when connected through the router.

The router lights are all on and look correct. It also gives me the
proper DHCP-based IP address and I can access the Router Admin page
from the browser.

I've tried releasing/renewing the DHCP.
I've tried resetting the TCP/IP stack.
I've also upgraded the firmware on the BEFW11S4.

I have McAfee Security Center running and I disabled that, thinking
that was the issue, but that didn't help either.

I even tried doing a System Restore to yesterday and that still didn't
work, so I have no idea what to do next. This is killing me.

 

[Chuck]

I have been a Vonage customer for over 10 months and use the WRTP54G
phone adapter/router. Today, all of a sudden, I can no longer connect
to the internet wirelessly via my laptop OR from the PC where I have an
ethernet cable plugged into a port on the router.

I called Vonage and they said it seemed defective and are shipping me a
new router.

HOWEVER, I tried plugging in my old Linksys BEFW11S4 wireless router
and I have the same connectivity problems.

If I connect the PC directly to the cable modem I can access the
internet fine, but not when connected through the router.

The router lights are all on and look correct. It also gives me the
proper DHCP-based IP address and I can access the Router Admin page
from the browser.

I've tried releasing/renewing the DHCP.
I've tried resetting the TCP/IP stack.
I've also upgraded the firmware on the BEFW11S4.

I have McAfee Security Center running and I disabled that, thinking
that was the issue, but that didn't help either.

I even tried doing a System Restore to yesterday and that still didn't
work, so I have no idea what to do next. This is killing me.

Do you know where connectivity was lost? Or was the problem with connectivity?
What was the exact error or problem observed?
<http://nitecruzr.blogspot.com/2005/06/background-information-useful-in.html>
http://nitecruzr.blogspot.com/2005/06/background-information-useful-in.html

Any chance DNS was the problem? I ask because a large amount of USA broadband
customers were without service, because of DNS problems, today.
<http://nitecruzr.blogspot.com/2006/05/identifying-dns-problem-in-your.html>
http://nitecruzr.blogspot.com/2006/05/identifying-dns-problem-in-your.html

 

[Lem]

I have been a Vonage customer for over 10 months and use the WRTP54G
phone adapter/router. Today, all of a sudden, I can no longer connect
to the internet wirelessly via my laptop OR from the PC where I have an
ethernet cable plugged into a port on the router.

I called Vonage and they said it seemed defective and are shipping me a
new router.

HOWEVER, I tried plugging in my old Linksys BEFW11S4 wireless router
and I have the same connectivity problems.

If I connect the PC directly to the cable modem I can access the
internet fine, but not when connected through the router.

The router lights are all on and look correct. It also gives me the
proper DHCP-based IP address and I can access the Router Admin page
from the browser.

I've tried releasing/renewing the DHCP.
I've tried resetting the TCP/IP stack.
I've also upgraded the firmware on the BEFW11S4.

I have McAfee Security Center running and I disabled that, thinking
that was the issue, but that didn't help either.

I even tried doing a System Restore to yesterday and that still didn't
work, so I have no idea what to do next. This is killing me.

This sounds as if your routers are not communicating with your ISP
(through the cable modem) rather than your PCs not communicating with
your routers. Check your router's WAN configuration. Did you have a
power surge or something else that might have caused a partial reset?

If your cable ISP ties your access to a particular MAC address (the MAC
address of your PC, for example), and you had used the "clone MAC
address" feature of the router, perhaps that somehow got reset. Check
the MAC address of your router and compare to the MAC address of the PC
that worked when directly connected.

While you're at it, you might also check the router's WAN status info to
see if it's receiving an IP address from your ISP and has the proper DNS
server and gateway IPs.