Thursday, 3 November 2011

IBM Sametime Standard 8.5.2 - Port allocations for NAT traversal

Saw this on my IBM Connections homepage this morning, thanks to the Recommendations widget on the Updates page, and thought it might be of use to me ( and others ) at some point down the line.

The Sametime® Connect client will dynamically allocate UDP ports as a result of ICE negotiation.

Ephemeral ports are allocated on clients and are assigned by the client's operating system. Ephemeral ports are usually in the range of 1024-5000 and are dynamically re-allocated by the operating system as needed. Proper function of the Sametime NAT traversal feature requires open access to UDP ports on both the TURN server and the Media Manager's Packet Switcher.

Note: UDP is the preferred protocol; TCP should be used only if UDP is not available (for example, due to company policy).

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