Experimental Physics and
Industrial Control System

Sorry I think I may have left out part the IPs are for example 192.168.1.40 and 192.168.2.50.  They exist on different subnets and I didn’t have trouble at first running one IOC on say 192.168.1.40 and having 192.168.2.50 be the client doing caget/camonitor. 

I have the client(192.168.2.50) env variable CA_ADDR_LIST=192.168.1.40 and it was working fine but now that I have switched things up and I have 192.168.1.40(CA_ADDR_LIST=192.168.2.50) be the client and 192.168.2.50 have the single IOC running it doesn’t seem to want to communicate. 

Which led to me believe I might have just gotten lucky before when it was working and I am missing a piece of the puzzle such as using cagateway or like you have mentioned broadcast addressing.  When you stated to set both to the same broadcast address, do you mean that 192.168.1.40 machine would have 192.168.2.255 and the 192.168.2.50 machine would have 192.168.1.255 set under CA ADDR_LIST respectively.