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<== Date ==> <== Thread ==>

Subject: UDP Warnings (VME and Linux) - Subnet wide
From: "Sullivan, Joseph via Tech-talk" <tech-talk@aps.anl.gov>
To: EPICS tech-talk <tech-talk@aps.anl.gov>
Date: Fri, 24 May 2019 21:16:03 +0000
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
sullivan@aps.anl.gov <> 630-252-8657
Advanced Photon Source
APS Xray Science Division
Beamline Controls & Data Acquisition Group






Replies:
Re: UDP Warnings (VME and Linux) - Subnet wide Mark Rivers via Tech-talk
Re: UDP Warnings (VME and Linux) - Subnet wide Johnson, Andrew N. via Tech-talk

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