Ubuntu 设置 Gateway 与 DNS

1. set gateway

# check route
$ ip route show

# set default route
$ route add default gw [IP]

2. set DNS

# edit file /etc/netplan/xxx.yaml

network:
    version: 2
    ethernets:
        ens18:
            dhcp4: no
            addresses:  [192.168.31.12/24]
            nameservers:
                addresses: [xxxx, xxxx]
                
# save and call command below
$ sudo netplan apply

# check gw, dns
$ sudo resolvectl status