Networking suddenly stopped working

wilbyforce · 09-14-2009, 08:30 AM

I've been using Ubuntu quite happily on my Fujitsu Siemens Lifebook laptop for months now. Today though, all networking failed. Wireless and Ethernet connections no longer work. If I boot into windoze, everything works. My Ubuntu desktop still works too.

Can anyone explain this? Might there have been a software update that my laptop didn't like? I'm at a loss how to resolve this with no working connection.

Any help most gratefully received.

Thanks.

camorri · 09-14-2009, 08:36 AM

Open a konsole, and run the command '/sbin/ifconfig' ( without the quotes ) and post the results. This will show the status of all your connections.

It would also help if you posted the result of 'netatat -r' This shows the routing information.

Can you connect to your router? From a web browser, type the ip address of your router in the address bar and see if it connects. Post the results.

wilbyforce · 09-14-2009, 08:47 AM

Well this is just too wierd! I've been fiddling about with this laptop for hours trying to get it to connect. I read your response so I booted back into Ubuntu and it connected wirelessly straight away!

I get the feeling this may be the start of something rather than the end.

Many thanks for the response

camorri · 09-14-2009, 08:53 AM

The commands I posted are the first places to look to determine status, so give them a try while things are working, and you will start to see the differences when things don't work.

tears · 09-14-2009, 09:52 AM

Quote:

Originally Posted by wilbyforce

Well this is just too wierd! I've been fiddling about with this laptop for hours trying to get it to connect. I read your response so I booted back into Ubuntu and it connected wirelessly straight away!

I get the feeling this may be the start of something rather than the end.

Many thanks for the response

dmesg is also your good friend.

------

Tears
http://www.techbabu.com

onebuck · 09-14-2009, 09:57 AM

Hi,

I would add that by using 'ifconfig -a' will show all devices even the ones that are down.

Quote:

excerpt from 'man ifconfig';

-a display all interfaces which are currently available, even if down

wilbyforce · 09-14-2009, 10:02 AM

Thanks all

wilbyforce · 09-14-2009, 10:10 AM

This is the output from /sbin/ifconfig with network working is as follows, does it look healthy?

Code:

eth0      Link encap:Ethernet  HWaddr 00:0b:5d:4a:0f:84  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:11 Base address:0x3000 

eth1      Link encap:Ethernet  HWaddr 00:0e:35:1c:1b:a5  
          inet addr:192.168.1.88  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::20e:35ff:fe1c:1ba5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1291 errors:1 dropped:1 overruns:0 frame:0
          TX packets:1402 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1207104 (1.2 MB)  TX bytes:316911 (316.9 KB)
          Interrupt:11 Base address:0x4000 Memory:d0205000-d0205fff 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:480 (480.0 B)  TX bytes:480 (480.0 B)