Options no more available in the latest 1.3 version
vyos@vyos6# set proto static route 0.0.0.0/0 dhcp-interface Possible completions: <text> DHCP interface that supplies the next-hop IP address for this static route vyos@vyos6:~$ sh ver Version: VyOS 1.3.0-rc4 Release Train: equuleus Built by: Sentrium S.L.