NetworkManagerService
From LinodeWiki
[edit] CentOS & Fedora NetworkManager Service
CentOS and Fedora include two services to control networking - one is called NetworkManager and the other is called network. NetworkManager, it seems, is meant to run when using the GUI network configuration tools and is likely to fail if you edit some configuration files by hand. We recommend that you use the network service on Linodes.
Checking which service is enabled:
chkconfig --list NetworkManager chkconfig --list network
The output of the chkconfig --list <service_name> command is a list of runlevels with on or off to indicate if the service is started in that runlevel. If NetworkManager is on, you should disable it and enable the network service.
Disabling NetworkManager and enabling network:
chkconfig NetworkManager off chkconfig network on
