Experimental Physics and
Industrial Control System

https://github.com/jeonghanlee/epics_NIOCs

I think you need to setup UDP broadcasting on the host, see this article: https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Make_Channel_Access_Reach_Multiple_Soft_IOCs_on_a_Linux_Host

P.S.: For some reason, I had to manually set the "$addr" and "$bcast" variables, they were not working for me.

Best Regards,
Abdalla.

-----Original Message-----
From: Tech-talk [mailto:tech-talk-bounces at aps.anl.gov] On Behalf Of Randall Cayford via Tech-talk
Sent: Tuesday, December 21, 2021 9:34 AM
To: Gofron, Kazimierz via Tech-talk <tech-talk at aps.anl.gov>
Subject: Multiple IOCs on a remote server

I’ve run into a problem I don’t understand.  I’m running 2 IOCs on a machine in a different subnet.   I can access the PVs by adding the remote machine’s IP address to my CA_ADDRESS_LIST.  However I can only access the PVs from one of the IOCs - the IOC that I start second.  Whichever IOC I start second. PVs from both are accessible from machines on the same subnet at the same time but only one set of PVs is accessible remotely.  If I restart the first IOC then it becomes the accessible one and the other becomes inaccessible.

I’ve tried setting up a cagateway on the remote machine and the behavior is the same.   Is there some trick to running multiple IOCs on a machine without which only one will respond to remote requests?

Randall
LBNL