Dodgy networking

phunni · Posted: Thu Jan 29, 2004 8:45 am Post subject: Dodgy networking

When I booted into my laptop this monring it seemed to have no network connectivity - despite my being told that eth0 had been brought up succesfully

I had the same problem yesterday and a reboot (I couldn't think of anything else!) fixed it, but not so today.

I then rebooted into windows and was straight on line. That makes me confident that the hardware is fine - so what can I do to track down the problem with connectivity in linux?
_________________
Old School is the way forward!

Caffeine · Posted: Thu Jan 29, 2004 10:05 am Post subject:

What does ifconfig and route tell you once eth0 is supposedly brought up?

phunni · Posted: Thu Jan 29, 2004 10:13 am Post subject:

exactly what I would expect it to - everything seems to be working except the actual networking. I am using the b44 module included in the gentoo kernel sources (it's a broadcom nic) but have heard that there is one you can download and compile from broadcom. I'm going to try and see if that performs differently...
_________________
Old School is the way forward!

Caffeine · Posted: Thu Jan 29, 2004 10:16 am Post subject:

Are you connecting to a hub of some sort? Can you see any activity lights when you try to ping out?

phunni · Posted: Thu Jan 29, 2004 10:23 am Post subject:

yes and yes

The hub is a netgear one. There are lights on both the hub and the nic connection on my laptop
_________________
Old School is the way forward!

Caffeine · Posted: Thu Jan 29, 2004 10:29 am Post subject:

So, a light on your hub blinks when you send ping packets.

Hmmm. How about your default route? Is it pointing at your ISP's gateway?

Can you ping the gateway? Or maybe tracepath/traceroute ?

Maybe install tcpdump and look at the packets leaving your eth0.

phunni · Posted: Thu Jan 29, 2004 10:33 am Post subject:

pinging my lan gateway (192.168.0.1) fails

I have tried the other driver from broadcom (bcm4400 module) and it seems to work. No idea why the other one didn't or which is a better driver, but this seems to be ok so far...

Thanks for your help anyway
_________________
Old School is the way forward!

Caffeine · Posted: Thu Jan 29, 2004 10:36 am Post subject:

What ever works is good.

aman · Posted: Mon Feb 02, 2004 2:58 am Post subject:

I am seeing a similar problem with my Broadcom 4400 NIC in my Dell Inspiron 5150 Laptop. Sometimes when exiting Windows XP and booting gentoo the link light will go out on my cisco switch and the nic card on my Laptop. The Dmesg says that eth0 was brought up correctly, yet it is not, because the eth0 interface is not started, and does not respond to any kind of manual configuration. Usually I can reboot and it will work fine. But I am wondering if it is some kind of interrupt conflict between Windoze and Gentoo that causes the card to malfunction occasionally. If anyone has any information on this please let me know.

_________________
Yes, I do run Gentoo on production servers...

phunni · Posted: Mon Feb 02, 2004 9:20 am Post subject:

Did you try the other driver? The one you download rather than the one you get included in the kernel?
_________________
Old School is the way forward!