NM doesa handle hostnames more gracefully now. howver, i think in your case the hostname was updated by something else (e.g. an ifup.d hook or resolvconf or ppp or dhcp).
NM doesa handle hostnames more gracefully now. howver, i think in your case the hostname was updated by something else (e.g. an ifup.d hook or resolvconf or ppp or dhcp).