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wired network adapter quits after cable is unplugged

asked 2014-04-07 14:35:03 -0500

bigrog gravatar image

Here's what happened: I have had my ethernet cable unplugged for a couple weeks from my server running Centos 6.x, then after plugging it in again I had no network. The network manager has no cards listed anymore. I have tried some things that I've found on the internet, but now I don't know if I have totally hosed it. One of the things I did was remove the 70-persistent-net.rules. I tried adding it to files )ifcfg-eth0 and it does not do anything. I have shut system down and removed the card and reinstalled the card but network manager still does not see the card. Everything worked great before unplugging the cable. I'm a little green at this as you can tell. help me please! PS this is all on local home lan system. Roger

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Roger, you might consider asking in CentOS support venues. Fedora users might have answers, but the site is dedicated to actual Fedora installations. Centos and Fedora are not the same.

randomuser gravatar imagerandomuser ( 2014-04-09 11:01:18 -0500 )edit

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answered 2014-04-13 11:33:15 -0500

bigrog gravatar image

Sorry to bother everyone with this! Problem was the cable, it just worked one day and not the next. Replaced it and running like a champ. thanks, Rog

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answered 2014-04-07 21:15:04 -0500

sergiomb gravatar image

updated 2014-04-08 16:18:18 -0500

Hi, you need recreate 70-persistent-net.rules , to have eth0 again, which maybe restart udevd (be careful) or simple reboot , on some stage of the boot 70-persistent-net.rules will be created , I don't remember now .

in reply of comment :

route

could you ping default gateway ?

maybe you are missing dns resolvers , have you any DNS confgiured in /etc/resolv.conf ?

cat /etc/resolv.conf

in reply of 2nd comment :

I remember on Network gui , you can disable NetworkManager to manage that interface ...

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Ok. I do have the file 70-persistent-net.rules and it looks like it's correct. I followed someones advice on another link and stopped NetworkManagerGui and am using the network service instead. When I restart the service it shows that the card goes thru the Stop and Restart process with all "ok"s. The ifconfig looks right as far as I can tell. I still can't ping anything though. I seem to be missing one key piece somewhere??

bigrog gravatar imagebigrog ( 2014-04-07 21:37:58 -0500 )edit

Hey thanks. I looked at the dmesg log and am posting the text below. I hope it's ok to paste it here, not sure how to go about posting long text? Here's the message log: [root@closet01 network-scripts]# dmesg lo: Disabled Privacy Extensions eth1: link down ADDRCONF(NETDEV_UP): eth1: link is not ready lo: Disabled Privacy Extensions eth1: link down ADDRCONF(NETDEV_UP): eth1: link is not ready lo: Disabled Privacy Extensions eth1: link down ADDRCONF(NETDEV_UP): eth1: link is not ready lo: Disabled Privacy Extensions eth1: link down ADDRCONF(NETDEV_UP): eth1: link is not ready lo: Disabled Privacy Extensions eth1: link down ADDRCONF(NETDEV_UP): eth1: link is not ready END dmesg

Looks like I need to start here first? The other thing that concerns me is that I am trying to use network service instead of NetworkManager, but in one of the commands I still saw that it ...(more)

bigrog gravatar imagebigrog ( 2014-04-08 09:17:00 -0500 )edit

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Asked: 2014-04-07 14:35:03 -0500

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Last updated: Apr 13 '14