How can I reinstall Network Manager after uninstalling it?

Question

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?

Solution 1

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).

Solution 2

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

Solution 3

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.

Comments

[Admin]

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".

[Alexander Janssen]

Check with yum whatprovides */nm-applet and yum whatprovides */nm-connection-editor what packages you need to install as well.

[Admin]

@YangJy Updated my answer.

[Admin]

@alexanderJanssen thank you for the comment, as now I have no Internet access on the laptop in question, I'll check your commands later. :)

[Admin]

@xperator Thank you again, it really helps :)

[vonbrand]

@YangYi, you can install the package containing a file (a program in this case) by yum install /usr/bin/nm-applet (or perhaps just /bin/nm-applet). You can give it a list of several files to process at once too.