Larger networks
To ensure minimum latency the ipMIDI driver uses multicast UDP rather than TCP/IP. This means that:
• The network connection should be as short as possible and should only use routers that can support high data
transfer rates. Problems have been experienced with some domestic routers, particularly when used with Pro
Tools.
• Because ipMIDI uses multicast UDP packets, messages between one computer and the Duality SE will be received
by all other computers on the network, potentially causing problems in installations with more than one Duality.
The UDP packets can be blocked by using a firewall router and connecting the main network to the WAN
connector. The firewall can then be configured to allow all traffic apart from UDP ports 21928 through 21947
(which are used by ipMIDI) and, optionally, port 50081 (which is used by the Duality SE Remote application).
Note that it may be necessary to use a separate Ethernet switch in place of the integrated firewall router switch
as some of these devices can not support the high data transfer rate required. The NetGear FS108 (an eight port
switch) has been used successfully. Most systems can be easily configured with a direct connection between Duality
SE and the controlling computer.
Page 34
Duality SE Installation Guide
System Installation Section 4
IP Network
Switch / Router
Network
Duality SE Console
Network
Network
Firewall (option)
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