Hi.

Experiencing a very bad thing here - after some updates installed on CentOS it lost any network connectivity!

So, it is a laptop (DELL XPS-15). CentOS 6.2 was installed on a 2nd HDD partition (side-by-side with Windows 7) - it was in February 2012. From time to I'm booting Linux to do some work. Today I have noticed that there is an "updates" icon in a {notification area}, I had clicked it, clicked [install all], it was installed, suggested me to restart OS, I restarted it... and now it cannot connect any networks!

So, LAN network does not work, WiFi network does not work. To check if it is an Linux OS problem I had restarted laptop in Windows 7 and checked network from there - both LAN and WiFi are working fine from Windows. So, I suspect it could be something related to automatic updates installed today.

Could you please advice - how to fix this problem with networking in Linux?

Regards,
Dmitry.

PS. uaname -a = "Linux uanbDbo-CentOS 2.6.32-220.17.1.el6.centos.plus.x86_64 #1 SMP Wed May 16 05:20:13 BST 2012 x86_64 x86_64 x86_64 GNU/Linux"

It sounds like NetworkManager was installed. To check to see if it was installed run:

That will give you a list and date of all packages installed and when they were installed.

If it did get installed try running NetworkManager and see if it will allow you to get on then.

It should put an icon in the upper right corner next to the updates icon.
Right click on the icon and select Edit Connections.
Put in your network information and it should work again.
You want to make sure it comes up when you restart the machine so you will want to do this :

If that does not work you may want to remove NetworkManager from the system.

verify the config file ONBOOT=yes