I am interested if a RG750 can be used as a switch in an existing LAN. I was thinking to use eth1 as a management port and the ports from eth2 to eth5 as a switch. The idea would be to create some queues to prioritize the traffic through the switch.
Thanks for the tip with NAT. It was the missing link. I managed to make it work by using a bridge with IP firewall turned on. As I understand (basic networking knowledge), you cannot mark switched packages.