Product SiteDocumentation Site Add an Interface to a Zone by Editing the Interface Configuration File
To add an interface to a zone by editing the ifcfg-em1 configuration file, for example to add em1 to the work zone, as root use an editor to add the following line to ifcfg-em1:
Note that if you omit the ZONE option, or use ZONE=, or ZONE='', then the default zone will be used.
NetworkManager will automatically reconnect and the zone will be set accordingly.