Contemporary Control Systems BASrouter Installation Guide (Firmware 2.x) - Manual (Page 21)

TD071200-0IK
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NPDU IP Address field. The NAT router must be configured
such that communications to the NAT router on the Secondary
BACnet/IP network port are port forwarded to the BAS Router.
The Public IP Address of the BAS Router will be the public IP
address of the NAT router.
Figure 16 — The Advanced Configuration Screen
If you click the Broadcast Distribution Table (BDT) button, the
screen of Figure 17 appears (if the BBMD Enable box is
checked). Enter the IP addresses of all BBMD devices to which
the BAS Router will communicate. Do not include the BAS
Router’s own IP address. Normally you will set the Broadcast
Distribution Mask (BDM) to 255.255.255.255. If the BAS
Router will communicate through an IP router which can
forward broadcasts, then set the BDM to the subnet mask
assigned to the destination subnet.
Figure 17 — The Broadcast Distribution Table