3Com 3C840 manual My video application

IP Network Connection Problems 13-11

Symptom Possible Cause Corrective Action

My video application	Some video applications
does not run when	using UDP streaming
Port Address	have two connections,
Translation (PAT) is	a TCP connection for
enabled.	control and a UDP
	stream for data. The
	TCP connection is
	initiated from the
	privately addressed
	workstation but the
	video stream may be
	initiated from the
	remote server. Because
	a mapping does not
	already exist for the
	UDP data stream, the
	data can not be
	mapped to a private
	address unless a static
	PAT port has been
	defined or the PAT
	default address is
	configured.

First verify the possible cause stated above is actually the problem. Set the Remote Site's PAT default address to your workstation's LAN address, then try to run your video application again. If it works, check to see if your video application allows you to specify a static UDP port. Microsoft NetShow allows you to configure a static UDP port in the Properties > Advanced screen. After setting a static port for the video application, you must add a corresponding static port entry on the OfficeConnect Remote 840. Set your Remote Site default PAT address to 0.0.0.0 before you try the static port.

If you cannot setup a static port on the Video application, check to see if the Video application allows you to specify TCP rather than UDP.

TCP streams are typically initiated from the private side.

If you still are unsuccessful, the video application may be embedding address and port information within the data portion of the frame. If this is the case, consult your application vendor for possible workarounds.