Create Systemd bridge files

in /etc/systemd/network

10-rascsi_bridge.netdev

[NetDev]
Name=rascsi_bridge
Kind=bridge

11-rascsi_bridge.network

This will also bridge the ethernet port to rascsi_bridge and will provide an ip address to a client

[Match]
Name=eth0


[Network]
Bridge=rascsi_bridge

Reboot raspberry pi