Experimental Physics and
Industrial Control System

I think those are the messages one sees when network scanning is being done. Is this happening only during the APS shutdown when they scan us?

Mark


Sent from my iPhone

On May 24, 2019, at 4:53 PM, Sullivan, Joseph via Tech-talk <[email protected]<mailto:[email protected]>> wrote:

Hello,

The following warning messages are appearing periodically (~2hrs) on all the EPICs IOC's (VxWorks and Linux - base-3.14.12.3) on a beamline here at the APS - (base-3.14.12.3).

../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.0.2:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.132.146:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.0.2:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.0.2:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.0.2:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.0.2:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.0.2:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.132.146:3956 ignored
../udpiiu.cpp: Undecipherable (payload too small) UDP msg from 169.254.132.146:3956 ignored

Eventually the CAS-Event processes fail (after a day or so). A reboot brings everything back and the sequence starts over.

This happened after the IOCs where brought up after a shutdown period.

Is this a network issue (someone on the CA ports that should not be) or should I look at the CA Clients (medm)?

Thanks for any help.

Joe


Joseph Sullivan
[email protected]<mailto:[email protected]> <> 630-252-8657
Advanced Photon Source
APS Xray Science Division
Beamline Controls & Data Acquisition Group

References:

UDP Warnings (VME and Linux) - Subnet wide Sullivan, Joseph via Tech-talk

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