Telekom furcsasagok

Néztem magam is. Szerintem hostname és hostnamectl parancs az interface, nem az mcedit. :)

man 5 NetworkManager.conf

       hostname-mode
           Set the management mode of the hostname. This parameter will affect only the transient hostname. If a valid static
           hostname is set, NetworkManager will skip the update of the hostname despite the value of this option. An hostname
           empty or equal to 'localhost', 'localhost6', 'localhost.localdomain' or 'localhost6.localdomain' is considered
           invalid.

           default: NetworkManager will update the hostname with the one provided via DHCP or reverse DNS lookup of the IP
           address on the connection with the default route or on any connection with the property hostname.only-from-default set
           to 'false'. Connections are considered in order of increasing value of the hostname.priority property. In case
           multiple connections have the same priority, connections activated earlier are considered first. If no hostname can be
           determined in such way, the hostname will be updated to the last one set outside NetworkManager or to
           'localhost.localdomain'.

           dhcp: this is similar to 'default', with the difference that after trying to get the DHCP hostname, reverse DNS lookup
           is not done. Note that selecting this option is equivalent to setting the property 'hostname.from-dns-lookup' to
           'false' globally for all connections in NetworkManager.conf.

           none: NetworkManager will not manage the transient hostname and will never set it.
 

sztem itt érdemes körülnézni.