Units
Drop-in
systemctl edit servicename
systemctl revert servicename
systemctl cat servicename
Network
Simple dhcp config
/etc/systemd/network/00-wired.network
[Match]
Name=enp1s0
[Network]
DHCP=yes
Bridge
3 files are needed to make it work. Each file is described below
/etc/systemd/network/10-bridge.netdev
[NetDev]
Name=br0
Kind=bridge
/etc/systemd/network/20-bridge.network
[Match]
Name=br0
[Network]
Address=192.168.29.99/24
Gateway=192.168.29.1
DNS=192.168.29.1
/etc/systemd/network/30-enp3s0.network
[Match]
Name=enp3s0
[Network]
Bridge=br0