[CentOS] How to make a network interface come up automatically on link up?

Wed Apr 24 17:07:41 UTC 2013
Gordon Messmer <gordon.messmer at gmail.com>

On 04/22/2013 10:30 AM, Joakim Ziegler wrote:
> I've tried various combinations of HOTPLUG=yes and no, and MANAGED=yes
> and no, then someone asked me if this was really not managed, so I
> posted the dmesg output above.

I'm pretty sure HOTPLUG is only used when the interface ITSELF is 
attached to the system at runtime, not the cable, and MANAGED isn't used 
at all.

If you set NM_CONTROLLED=no then the configuration will be loaded only 
if the system starts the "network" service and the configuration will 
not change on link up/link down.

Otherwise, you need to check the messages log file for information from 
NetworkManager.  dmesg will not tell you what you need to know.