buntu@maas21-node1:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
dns-nameservers 10.13.21.2
dns-search maas
auto ens3
iface ens3 inet manual
mtu 1500
auto ens4
iface ens4 inet manual
mtu 1500
auto ens5
iface ens5 inet manual
mtu 1500
auto ens6
iface ens6 inet manual
mtu 1500
auto br-ens3
iface br-ens3 inet static
address 10.13.21.4/24
bridge_ports ens3
hwaddress 52:54:00:a9:24:04
mtu 1500
auto br-ens4
iface br-ens4 inet static
gateway 10.13.21.1
address 10.13.21.3/24
bridge_ports ens4
hwaddress 52:54:00:6f:f4:b5
mtu 1500
source /etc/network/interfaces.d/*.cfg