file: /etc/systemd/network/10-eth0.network
[Match]
Name=eth0
[Network]
Gateway=192.168.1.1
Address=192.168.1.10/17
DNS=12.168.1.99
DNS=192.168.2.99
DHCP=no
[DHCP]
UseDNS=false
if the DNS= is not specified on the file, resolve.conf will be overwritten with DHCP provided values (if the DHCP flag is not present)