ip link add link enp5s0 name enp5s0.4001 type vlan id 4001
ip link set enp5s0.4001 mtu 1400
ip link set dev enp5s0.4001 up
ip addr add 192.168.200.3/24 brd 192.168.100.255 dev enp5s0.4001
add to
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/etc/netplan vlans: vlan.4001: id: 4001 link: enp7s0 addresses: [192.168.200.3/24]