Experimental Physics and
Industrial Control System

"Hill, Jeff" <[email protected]> · Mon, 23 Feb 2015 22:28:41 +0000

Hi,

As long as you don't use the "1.2.3.4" unicast form of address in EPICS_CA_ADDR_LIST then you can safely treat this warning message as benign.

I have heard that some of the sites are working around this issue by placing their IOCs, when there are multiple IOCs per host, in dedicated virtual machines.

I also have implemented support for binding the soft IOC to a dedicated network interface in a new CA server we use here, but this server isn't included at this time in any version of EPICS released at launch pad. This would allow for working around this issue by employing multiple virtualized network interfaces.

Jeff

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of Chen Xue
> Sent: Monday, February 23, 2015 10:42 AM
> To: [email protected]
> Subject: 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