Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Mon, 29 Mar 2004 12:42:54 -0600

Hi Ernest,

Thanks for the reply.

I really don't think it's anything with CA.  These IOCs were running
fine for a long time, years in some cases.  Suddenly last week they all
hung up at the same time.  I am able to completely reproduce the problem
by simply sending 2000 1500-byte ping packets to them as fast as
possible.  So I am quite sure that some computer on the network is doing
the equivalent of that.  It is happening every few minutes or hours. The
problem is that the NSLS is one giant subnet with 512 addresses.  If we
disconnnect the switches at the beamline from the NSLS subnet then
things are fine, so it's not a problem with the local CA server and
clients.  They need to get a sniffer on the network and find who the
culprit is.  More importantly, Wind River needs to fix their network
software so that sending a 2000 1500-byte packets does not crash the
network.

Mark

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System