network interfaces not detected

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cavit8
Posts: 15
Joined: 26. Apr 2014, 17:40

network interfaces not detected

Post by cavit8 »

I had a problem pop up that on my most recent boot, the network was not detected.
- running WiCD showed no wired or wireless network although the network is up (using it on my phone now).
ifconfig -a shows only the local loop lo available
dhcpcd is not running and on starting as root complains that no network connections are available.
The only recent change to the system was adding mindlna which had been working. A power blip today shut the router off but its working fine with wireless, roku and home lighting system.
Any suggestions?
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maximus
Posts: 141
Joined: 2. Sep 2009, 01:41

Re: network interfaces not detected

Post by maximus »

You didn't mention how your machine connects to your network (wired/wireless?) but ifconfig -a should list any active or inactive network interfaces connected to your system. If it was seeing them before, and now it's not seeing any, it indicates to me that possibly your hardware is faulty. I wonder if the power 'blip' you mentioned affected your machine's network card. Try running the following command, and see if there's any output:

Code: Select all

sudo lspci | egrep -i 'network|ethernet'
cavit8
Posts: 15
Joined: 26. Apr 2014, 17:40

Re: network interfaces not detected

Post by cavit8 »

I connect via lan (eth0).

No output from lspci with grep and reviewing the entire lspci output, nothing relevant seems to be showing up.

I don't believe the machine was running when the power blip occurred, which is while it may be related somehow its hard to see how. I'll see if I have a live cd around and try that too. I was hoping it wasn't a hardware issue but that was my first thought. I'll have a boo at the bios settings was well on the off chance there's something there.
Thanks for the suggestion.
- cam
cavit8
Posts: 15
Joined: 26. Apr 2014, 17:40

Re: network interfaces not detected

Post by cavit8 »

For no apparent reason, things seem to be working again. While I did check and recheck the lan cables, that shouldn't have affected detection of wifi. The only other thing I've been doing is trying to get live distros to recognize my usb cd player :-p

So a favourable but inexplicable conclusion...
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gapan
Salix Wizard
Posts: 6361
Joined: 6. Jun 2009, 17:40

Re: network interfaces not detected

Post by gapan »

In general, if you find things start/stop working at random, it's most definitely a hardware failure. Software (usually) doesn't work that way. It could be that your network card is slowly dying, or more likely your cables are worn out and need replacement.
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