The BACnet discovery process uses broadcast messages, but broadcasts are blocked by an IP router. To deal with subnets, a BACnet/IP Broadcast Management Device (BBMD) must be used. The BBMD functionality within the EIPR can be enabled from this page. It is disabled by default. You also need to configure the basic BACnet/IP settings on this page to enable BACnet communication through the EIPR.
The EIPR combines IP routing and BBMD. When the EIPR has the firewall enabled your system will need to use two UDP ports in order to traverse the EIPR. The WAN port will utilize one UDP port, for example BACO and the LAN port will utilize another, for example BAC1. The devices on the WAN port will need to utilize the EIPR's WAN UDP port setting and devices on the LAN port will need to use the EIPR's LAN UDP port setting. The port forwarding required to make this work will be automatically configured for you. If the firewall is disabled then there is no port forwarding and WAN and LAN BACnet devices will all utilize the same UDP port setting.
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