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Weird Networking issue

post #1 of 14
10/29/06 at 5:01am
Thread Starter 
Hey guys. I have noticed a strange issue with my laptop, thought maybe someone could help me.

I noticed that for some odd reason my 9300 will not let me use the internet when it is connected directly to a cable modem. I have to connect a router to the modem for it to browse.

Seems really strange to me that it would only work when connected to a router and not the cable modem.

I know the latest drivers are instaled for the NIC and it is set to obtain an IP automatically.

I powercycled my modem and PC and for some reason it obtains a generic 169# instead of the IP assigned by the router.

Any ideas? Thanks.

(It is a Broadcom NIC)
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post #2 of 14
10/29/06 at 5:05am
Some questions:

1. Is the cablemodem set to be a DHCP server?
2. What is/are the "no internet" symptoms...e.g. your browser says it can't find so-and-so site (like google)?
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post #3 of 14
10/29/06 at 5:23am
try unplugging the modem for 30 seconds. Make sure its connected to your laptop when you turn it back on. Then when it will get your mac address and you should be fine. You would have to do that again if you plug the modem to an other computer.
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post #4 of 14
10/29/06 at 5:30am
Interesting...
That sound's like the problem. Nice!
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post #5 of 14
10/29/06 at 5:40am
Quote:
Originally Posted by galahad05
Interesting...
That sound's like the problem. Nice!
after rereading his post...I'm not so sure anymore.
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post #6 of 14
10/29/06 at 5:51am
In any case, the standard "ipconfig" check should tell all...
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post #7 of 14
10/29/06 at 2:31pm
Thread Starter 
Thanks for the suggestions guys. I have gone through all of that. Ipconfig shows a 169.x.x.x which is usually a generic IP. I turned of the modem and leaved it off for at least a minute and then turned it back on (turned off as in unplugged all the cables from the back to fully powercycle it). After the lights were on I turned my computer back on. Still the same thing. I've tried ipconfig /release and ipconfig /renew and it's still the same.

The modem does not have any configuration settings like a GUI or anything, it just gives you the IP address from the ISP. What's really weird is that the computer did the same thing when I was in New Jersey over the summer using a different cable ISP. My computer was working fine on the router but when the router was acting up I tried connecting my laptop directly to the modem and it did the same thing. I then took my friends laptop and it worked fine.

What's even better is that since the Summer Dell has switched out my motherboard, so it has a different NIC. Also, I always have all the latest drivers installed. This issue is really baffling me.
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post #8 of 14
10/29/06 at 2:45pm
Is this a cable modem or a DSL? Also, if DSL, does it require PPPoE or somesuch to login?


In any case, can you direct-IP to a site? In other words, perhaps you have a DNS problem.

Make sure ipconfig shows that you have a legitimate DNS server.

EDIT: you could try pinging one of google's servers:
ping google.com
ping 64.233.187.99
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post #9 of 14
10/29/06 at 3:06pm
I had a problem very similar to yours... Make sure you network card isn't forced to 100BaseT or 1000BaseT(Depeding on card). I forced my network card to 100BaseT and it would connect to my 10/100BaseT router with no problems. As soon as I tried plugging directly into the cable modem I couldn't connect at all. I was stumped just like you, until I realized that my cable modem only has a 10BaseT interface.

It might be a long shot but verify that your nic card is set to auto negotiate speed.

Prince
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post #10 of 14
10/29/06 at 5:20pm
169.xxx.xxx.xxx isn't a standard IP.

Do you have it set to DHCP?

To check:

Start->Control Panel->Network Connections->Local Area Connection->Properties->TCP/IP->Properties->General

This should show you your lease information.
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post #11 of 14
10/29/06 at 5:47pm
It could be that the modem will only give an ip to the mac address of the router if that is the way it was originally setup. You can try leaving the modem unplugged from power for at least an hour but sometimes it takes overnight so it forgets the previous mac or you may have to call the isp and give them the mac address of your laptop.
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post #12 of 14
10/29/06 at 7:28pm
IP addresses beginning in 169.x.x.x are auto config IPs that the network interface gets assigned when it cannot find a DHCP server.

That being said it almost sounds as though your ISP may have the MAC of the router Whitelisted. Can you connect with any other system directly?
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post #13 of 14
10/30/06 at 2:10am
Thread Starter 
Strange. Tried it again tonight and it worked. The duplex settings sounded like a good idea. DHCP has been enabled in TCP/IP Settings.

Thanks again for the suggestions all.

Computers.... gotta love 'em. :P
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post #14 of 14
10/30/06 at 7:33am
Quote:
Originally Posted by Draconis77
Strange. Tried it again tonight and it worked. The duplex settings sounded like a good idea. DHCP has been enabled in TCP/IP Settings.

Thanks again for the suggestions all.

Computers.... gotta love 'em. :P
Glad you got it worked out.
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