Experimental Physics and
Industrial Control System

Mazanec Tomáš <[email protected]> · Mon, 23 Feb 2015 18:15:43 +0000

Hi

I think the fix is here:
https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Make_Channel_Access_Reach_Multiple_Soft_IOCs_on_a_Linux_Host

The problem, you've described, refers to a general behaviour of Linux UDP stack. 
If UDP broadcast is used (like with CA configured by EPICS_CA_ADDR_LIST), only the first client (IOC) is served by OS.

Cheers,
Tomas

________________________________________
Od: [email protected] [[email protected]] za uživatele Chen Xue [[email protected]]
Odesláno: 23. února 2015 18:41
Komu: [email protected]
Předmět: EPICS_CA_ADDR_LIST question

Hi, there,

I have multiple IOCs in a same host. I set up my EPICS_CA_ADDR_LIST to its
broadcast address of IOC host as "1.2.3.255" instead of its IP address
"1.2.3.4" or localhost. But when I started IOC, I still got the warning as
below.

cas warning: Configured TCP port was unavailable.
cas warning: Using dynamically assigned TCP port xxx,
cas warning: but now two or more servers share the same UDP port.
cas warning: Depending on your IP kernel this server may not be
cas warning: reachable with UDP unicast (a host's IP in EPICS_CA_ADDR_LIST)
iocRun: All initialization complete

BTW, my IOC host and client are in the same subnet.

How should I fix it?

Thanks,

Chen

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System