Netplan Config example

network:
    ethernets:
        ens160:
            addresses:
              - 172.16.234.57/24
            gateway4: 172.16.234.1
            nameservers:
              search: [mabnaco.local.zerobuilding.ir]
              addresses: [172.16.100.3, 172.16.0.2]
#            dhcp4: true
    version: 2

By Route

network:
    version: 2
    renderer: networkd
    ethernets:
        enp3s0:
         addresses:
             - 9.0.0.9/24
             - 10.0.0.10/24
             - 11.0.0.11/24
         #gateway4:  # unset, since we configure routes below
         routes:
             - to: 0.0.0.0/0
                 via: 9.0.0.1
                 metric: 100

network:
    ethernets:
        ens160:
            addresses:
            - 172.16.234.57/24
            gateway4: 172.16.234.1
            nameservers:
                addresses:
                - 172.16.100.3
                - 172.16.0.2
                search:
                - mabnaco.local
                - zerobuilding.ir
    version: 2