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Added FAQ 18 for firewall info (#587)

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Steve Karg
2024-03-01 16:13:57 -06:00
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doc/README.faq
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@@ -152,3 +152,10 @@ A-17: Yes, static address binding is supported as of version 0.4.3. Use a file c
;DeviceID MAC SNET SADR MAX-APDU ;DeviceID MAC SNET SADR MAX-APDU
4194302 05 0 0 50 4194302 05 0 0 50
55555 C0:A8:00:18:BA:C0 26001 19 50 55555 C0:A8:00:18:BA:C0 26001 19 50
Q-18: I have downloaded the BACnet stack but can't get Who-Is or EPICS applications to work. When I capture their packets with WireShark, I see Who-Is broadcast packet sent by the client application, but Wireshark shows no I-Am packets. How do I make it work?
A-18: Firewalls on modern OS block incoming and outgoing network traffic and require you to 'allow' the port that BACnet/IP uses. To allow the default BACnet/IP UDP port 47808 Linux with UFW:
$ sudo ufw allow 47808/udp