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How Bad are Selfish Investments in Network Security?

There are presently two ways that BACnet can be “spoken” over the public network, and these two methods are prescribed in the BACnet standard in Annex H and Annex J (BACnet/IP). For Annex H communication, a BACnet message destined for a remote BACnet network that must traverse a public network is sent by a tunneling mechanism. A device called a “BACnet/Internet Protocol Packet-Assembler-Disassembler” (B/IP PAD) exists on both networks, keeps track of all other B/IP PADs, and inspects the destination network (DNET) field of packets to see if they are destined for a remote network. If so, the B/IP.