network:
  version: 2
  renderer: networkd
  ethernets:
    lan:
      match:
        macaddress: c8:2a:14:55:14:9e
      addresses:
      - 192.168.1.253/24
      dhcp4: false
      gateway4: 192.168.1.254
      nameservers:
        addresses:
        - 192.168.1.254
      set-name: lan
    softether:
      match:
        macaddress: a8:60:b6:09:94:7c
      dhcp4: false
      optional: true
      set-name: softether
    wifi:
      match:
        macaddress: 40:6c:8f:04:74:a9
      dhcp4: true
      optional: true
      set-name: wifi

$ ip a
2: softether: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether a8:60:b6:09:94:7c brd ff:ff:ff:ff:ff:ff
    inet6 fe80::aa60:b6ff:fe09:937c/64 scope link
       valid_lft forever preferred_lft forever