====== 22 NI Discovery Protocol ======


Discovery of networked NI devices (targets) by other devices (hosts) requires bi-directional communication between host and target. By default, NI devices do not have communication restrictions. However, devices that are not produced by NI may use firewall software as a security measure to restrict communication. 

NI network device discovery requires access to the following ports.
 
^Port	^Protocol	^Description    ^
|5353	|UDP		|Discovery of devices using the [[https://en.wikipedia.org/wiki/Multicast_DNS|multicast Domain Name System]] (mDNS) protocol     |
|44515	|UDP		|Discovery of legacy devices in safe-mode when a routable IP address is not known  |
|44516	|TCP		|Discovery of legacy devices in safe-mode when a routable IP address is known   |
|44525	|UDP		|Discovery of legacy devices in run-mode   |
||||
|52725	|TCP		|NI Network Browser utility   |
|3580	|UDP		|web monitoring and configuration server port   |

<WRAP left round important 100%>
As of 2023, it seems that Linux RT does not use the UDP-based communication anymore but is using an mDNS based protocol. The UDP protocol is deprecated and only used on Phar Lap and VxWorks devices.

</WRAP>


=== Other Resources ===

Configuring Software and Hardware Firewalls to Support National Instruments Products: 
http://www.ni.com/white-paper/12402/en/