/etc/network/interfaces里：
# https://unix.stackexchange.com/a/128662/453838
allow-hotplug enp0s2
iface enp0s2 inet static
address 10.249.44.127
netmask 255.255.248.0
gateway 10.249.40.1
dns-nameserver 10.248.98.30
# https://askubuntu.com/questions/616856/how-do-i-add-an-additional-ipv6-address-to-etc-network-interfaces
iface end1 inet6 static
address fd00:1::1
netmask 64网卡名字和当前子网掩码可以通过ip addr看。
当前网关可以通过route -n查看。
当前dns服务器的IP在/etc/resolv.conf里。
重启网络：
sudo systemctl restart networking