Anybus Defender 4000 Series and up, with NAT, DPI or PRO licenses.
2 ethernet ports to connect together.
Choose two or more Ethernet ports to use as switch, if you don’t already have the ports activated go to:
Interfaces -> Assignments -> Available network ports
And Add the igb# you want to use.
Click the OTP name and enable the port
And Save.
Go to Interfaces -> Assignments -> Bridges -> Add
In Member Interfaces hold Ctrl and click the interfaces you want to add to the bridge, you can also add a Description.
Go back to Interfaces -> Assignments and Add the bridge at Available network ports and enable it.
You could add an IP address to LAN, OTP1 or BRIDGE to allow access to the Defender, but it is not necessary to make it work like a switch.
You will need to add rules under Firewall->Rules on either LAN or OTP1.
Example, you want the IP 192.168.0.12 on LAN to be able to ping 192.168.0.15 on OTP1, here is how it would look.