Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Mon, 12 Nov 2001 13:46:52 -0600

Hi Geoff,

Geoff Savage wrote:
> 
> Here is an error message about bad UDP messages.  We have seen this
> from two different IOCs over the weekend.
> 
> CAC: post_msg(): Corrupt cmd in UDP msg b
> ../iocinf.c: bad UDP msg from d0olctl50.fnal.gov:5064
> 
> Could this be caused by low memory on the IOCs?  Each were running
> around 80-90% of memory capacity of 16MB.

I'll leave Jeff to answer that, but would ask what you know about the
machine d0olctl50.fnal.gov?  Does it normally have CA connections to the
relevent IOCs?  Could it have been running something like a network
sniffer at the time of the messages?  If something other than CA had sent
either directed or broadcast UDP messages to port 5064 I would expect
something like that error to be reported.

- Andrew
-- 
Perfection is reached, not when there is no longer anything to add,
but when there is no longer anything to take away.
- Antoine de Saint-Exupery

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System