Currently the only drivers that can be configured to use the second Ethernet port are Bacnet, ModbusTCP and EibIp.
The JACE does not act as an Ethernet router or switch, meaning it does not allow TCP/IP traffic to pass from one port to the other.
The second Ethernet port can be used to isolate a BACnet Ethernet or IP network from the primary LAN. All BACnet devices would be connected on the network segment that was connected to the secondary Ethernet port on the JACE. BACnet points that are proxied in the station could then
be viewed or commanded through graphics that are served up by the webService via the primary
Ethernet port.
The Niagara Network and the webService will be available on both network interfaces. With BACnet, you select which network interface to use on the link settings of the IP-port and/or Ethernet-port object under the BACnet network. With Modbus TCP the IP layer decides which network interface to use based on the IP address assigned to the Modbus TCP Device Object.
The second port must be on a different subnet. The second subnet cannot also have a default gateway - so you will be limited to one subnet on the second network interface.
