Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 20 Jan 2009 17:37:15 -0600

On Tuesday 20 January 2009 17:17:09 Szalata, Zenon M. wrote:
> I have a number of soft IOC's.  Each individually works fine.  I have
> recently noticed that after I start the second IOC, EDM can no longer
> establish "new" CA connections with the first IOC.  It does not matter
> which of my IOC's I start first and which second.  The end result is that
> starting the second IOC breaks the channel access to the first.  I
> suspected caRepeater, which I restarted.  This made no difference.
>
> These IOC's are built with epics R3.14.9, asyn R4.9, streamdevice R2-3 and
> a few other support modules.

Are these soft IOCs all running on the same server?  Is this server on 
different subnet than your EDM client, so that on the client machine you have 
to have EPICS_CA_ADDR_LIST set to the server's IP address to reach it?

If the answer to those questions is yes, change the EPICS_CA_ADDR_LIST entry 
from the server's IP address to the broadcast address of the subnet that it 
belongs to, because you've hit the classic Directed UDP distribution issue 
which is arguably a bug in pretty much every single IP network stack in 
existence.

If not, you'll need to tell us more about your settings.

- Andrew
-- 
The best FOSS code is written to be read by other humans -- Harold Welte

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System