UDP Slows Down RT Network Communications

[cjwhite]

Hello. We are experiencing an extreme slowdown in communicating with an RT PXI. When the host pc requests data via either FTP or Vi Server, it takes about 90 seconds to transfer 5 MB. We tracked the problem down to an Allen-Bradley device that is broadcasting UDP across the network. When that device is removed from the network, transfer time for 5 MB is reduced to 3 seconds. Note that there are no programs running on the RT PXI and that this problem has been reproduced on other RT PXI systems on the same network. The slowdown is also experienced when using Windows FTP to transfer data from RT PXI. However, there is no slowdown when using FTP between two Windows machines. Does RT PXI always try to process UDP messages? Is
there a way to disable that feature?

Chris White
Archimedes Technology

[JR_A.]

The RT PXI system is not processing these UDP messages and the problem is probably related to added network traffic. This may be caused by the RT system being on the same subnet as the Allen-Bradley device and the Windows machines may not be. Thus communication to the RT system has to 'wade' through the UDP traffic. Your IT department might be helpful to get them on different subnets.

Regards,

JR A.
Application Engineer
National Instruments