netplan

 root@fw:/etc/netplan# cat 50-cloud-init.yaml 
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        eth0:
            dhcp4: true
            dhcp4-overrides:
                route-metric: 100
            dhcp6: false
            match:
                macaddress: 0a:0f:ec:f2:19:5b
            set-name: eth0
        eth1:
            dhcp4: true
            dhcp4-overrides:
                route-metric: 200
            dhcp6: false
            match:
                macaddress: 0a:19:88:8e:0d:d7
            set-name: eth1
        eth2:
            dhcp4: true
            dhcp4-overrides:
                route-metric: 300
            dhcp6: false
            match:
                macaddress: 0a:c9:85:69:e1:d3
            set-name: eth2
    version: 2
#---------------------------------------------
ubuntu@west:~$ cat /etc/netplan/50-cloud-init.yaml 
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        eth0:
            dhcp4: true
            dhcp6: false
            dhcp4-overrides:
                use-routes: false
                use-dns: false
            nameservers:
                addresses: [8.8.8.8]
            routes:
            - to: 0.0.0.0/0
              via: 192.168.0.40
              metric: 100
              on-link: true
            match:
                macaddress: 0a:23:28:98:bb:e9
            set-name: eth0
    version: 2
ubuntu@west:~$ 

ubuntu@east:~$ cat /etc/netplan/50-cloud-init.yaml 
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        eth0:
            dhcp4: true
            dhcp6: false
            dhcp4-overrides:
                use-routes: false
                use-dns: false
            nameservers:
                addresses: [8.8.8.8]
            routes:
            - to: 0.0.0.0/0
              via: 192.168.0.80
              metric: 100
              on-link: true
            match:
                macaddress: 0a:d6:96:d7:8f:e9
            set-name: eth0
    version: 2