cannot obtain ip from cable modem

August 4, 2011 at 17:40:34
Specs: Windows Vista
my win xp desktop cannot obtain an ip address when connected directly to the cable modem but can when connect through a router. I've tried powering down the computer and modem and power up in the correct sequence. ipconfig / renew returns an error relating to not able to get an ip.

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August 5, 2011 at 07:01:11
additional explanation

I have Linksys router attached to the cable modem. The desktop has a network card is connected via cable to the router along with other wireless devices. All works fine until the other day when the cable company had an outage. The next day I noticed that the modem lights were all back on but I could not connect through the router. So I disconnected the xp desktop catv cable and plugged it into the modem directly and could not obtain an ip. I then shut down the computer and the cable modem. And then powered up the modem and waited for a while then booted the desktop. I still could not get connected. I called the cable co and the accessed that the modem was functioning properly. I then hard wired a different computer to the modem after cycling the modem and bingo it worked. I then tried the desktop again following the same cycling procedure but still no connection. I tried ipconfig release and renew but nothing. I then disconnected the desktop and reconnected the router then connected the desktop to the router and success all worked well. This does not make sense to me so I disconnected the router and plugged the desktop back into the modem and cycled the modem and rebooted the desktop - nothing. the ip given was the default 169... The question is: how is it that the desktop can obtain an ip through the router but not from the modem itself. I'm perplexed. It's not a network card issue, or the ip stack as I am able to connect through the router. I'd appreciate any input to this very strange situation.

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October 7, 2011 at 18:54:21
Hey There,
I face the same situation, did you find anything interesting on your side?

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October 8, 2011 at 20:38:28
Since you should always use a router for safety (firewall) with a high speed internet connection, it is not really important for the computer to directly access the modem. Just resetting the modem and the router will usually work to get things up and running again.

If you have a question of your own, begin your own post and include all relevant facts so we can help you.

You have to be a little bit crazy to keep you from going insane.

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