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I am running a version of RHCE6 on my laptop, and lately I've been trying various stuff about network configuration through command line. Last night, I tried removing the NetworkManager using 

yum remove NetworkManager

from the system, so that I could have more control of the network through the command line. But the result is, I didn't manage to configure the wireless connection through wpa_supplicant , and I need wireless connection during my travel.
I tried to reinstall using : 

yum install NetworkManager

Some version installed, but I didn't get an icon in the taskbar, and of course, the network doesn't work. The package I previously removed (about 24MB) was much larger that the one I just installed(about 2MB), I think some dependencies must be missing.

How could I Reinstall network manager correctly to restore my connectivity?

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To identify discrepancy in packages removed/installed, you can check /var/log/yum.log*. Scroll back to where NetworkManager is removed, and look at all the packages removed with the same datestamp (removed because they depended on NetworkManager).

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Did you try bringing up your network 'by hand'? This is easiest if you can be connected by a ethernet cable (non-wireless) just long enough to reinstall Networkmanager. Then it is likely a simple matter of (as 'root', of course):

ifconfig eth0 up
dhclient eth0

If it simply must be via wireless there is a command-line formula which goes:

wpa_supplicant -B -iwlan0 -c/etc/wpa_supplicant.conf -Dwext && dhclient wlan0

Note your driver maybe be other than 'wext'; and all this presumes that you have /etc/wpa_supplicant.conf already set-up.

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I know this is an old question, but I hit this problem recently and the answers here helped. I will expand and say when you reinstall NM try:

yum install NetworkManager*

That will pickup the ui packages needed for the applet.

When I parsed my yum logs I found this:

Jun 16 18:54:43 Erased: NetworkManager-gnome
Jun 16 18:54:43 Erased: NetworkManager-openconnect
Jun 16 18:54:44 Erased: NetworkManager
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Did you check the Wiki page for NetworkManager

Install :

yum install NetworkManager

Check if running or Start if not:

service NetworkManager status

Start if it's not running:

service NetworkManager start
chkconfig NetworkManager on

Disable network and wpa_supp services as stated in Wiki:

chkconfig network off
chkconfig wpa_supplicant off

And Reboot. To open it's GUI:

nm-applet
nm-connection-editor

UPDATE 1:Check out Reinstall all dependencies of a given package?

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  • Thank you for the answer. I've run all the commands you listed, still no avail. Opening the GUI using nm-applet and nm-connection-editor would return "command not found". – Yang Jy Nov 3 '12 at 8:12
  • Check with yum whatprovides */nm-applet and yum whatprovides */nm-connection-editor what packages you need to install as well. – Alexander Janssen Nov 3 '12 at 8:22
  • @YangJy Updated my answer. – xperator Nov 3 '12 at 8:39
  • @alexanderJanssen thank you for the comment, as now I have no Internet access on the laptop in question, I'll check your commands later. :) – Yang Jy Nov 3 '12 at 10:45
  • @xperator Thank you again, it really helps :) – Yang Jy Nov 3 '12 at 10:45

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