Experimental Physics and
Industrial Control System

Freddie Akeroyd - STFC UKRI via Tech-talk <tech-talk at aps.anl.gov> · Tue, 13 Sep 2022 13:44:33 +0000

Hi Carsten,

Are there any firewalls involved on the computers concerned? I see the IOC that works is on the default EPICS 5064 port whereas the one that doesn’t is on a dynamically allocated port. 

If you set EPICS_CA_ADDR_LIST= my_computer.bessy.de and it doesn’t work, I think that may be because it then sends a unicast UDP for name queries that only one of the iocs might see.  Is the EPICS_CA_ADDR_LIST on the gateway computer set to use uinicast or broadcasts to resolve PVs?

Regards,

Freddie

> -----Original Message-----
> From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Carsten
> Winkler via Tech-talk
> Sent: 13 September 2022 14:21
> To: tech-talk at aps.anl.gov
> Subject: EPICS_CA_ADDR_LIST and multiple instances of a SoftIOC on Windows
> 
> Hello tech-talkers,
> 
> I have the following situation. My computer is running MS Windows and
> several SoftIOCs (EPICS BASE 7.0.6.1). Furthermore, there is a CA gateway in
> the local network.
> 
> Without EPICS environment variables I get the following results:
> 
> cainfo TestPV:aiExample
> CA.Client.Exception...............................................
>      Warning: "Identical process variable names on multiple servers"
>      Context: "Channel: "TestPV:aiExample", Connecting to:
> my_computer.bessy.de:5064, Ignored: ca_gateway.bessy.de:5064"
>      Source File:
> D:\epics\epics-base-R7.0.6.1\modules\ca\src\client\cac.cpp line 1320
>      Current Time: Tue Sep 13 2022 08:19:36.713908800
> ..................................................................
> TestPV:aiExample
>      State:            connected
>      Host:             my_computer.bessy.de:5064
>      Access:           read, write
>      Native data type: DBF_DOUBLE
>      Request type:     DBR_DOUBLE
>      Element count:    1
> 
> cainfo TestPV:ai1
> TestPV:ai1
>      State:            connected
>      Host:             my_computer.bessy.de:62425
>      Access:           read, write
>      Native data type: DBF_DOUBLE
>      Request type:     DBR_DOUBLE
>      Element count:    1
> CA.Client.Exception...............................................
>      Warning: "Identical process variable names on multiple servers"
>      Context: "Channel: "TestPV:ai1", Connecting to:
> my_computer.bessy.de:62425, Ignored: ca_gateway.bessy.de:62425"
>      Source File:
> D:\epics\epics-base-R7.0.6.1\modules\ca\src\client\cac.cpp line 1320
>      Current Time: Tue Sep 13 2022 08:19:27.881409000
> ..................................................................
> 
> Okay, lets fix the issue "Identical process variable names on multiple servers".
> set EPICS_CA_ADDR_LIST=ca_gateway.bessy.de
> set EPICS_CA_AUTO_ADDR_LIST=NO
> 
> Now I get following results:
> 
> cainfo TestPV:aiExample
> TestPV:aiExample
>      State:            connected
>      Host:             ca_gateway.bessy.de:5064
>      Access:           read, write
>      Native data type: DBF_DOUBLE
>      Request type:     DBR_DOUBLE
>      Element count:    1
> 
> cainfo TestPV:ai1
> Channel connect timed out: 'TestPV:ai1' not found.
> 
> Obviously the variables from the second SoftIOC with port 62425 are not
> found anymore. I have the same problem when I enter the address of the
> client computer in the EPICS_CA_ADDR_LIST.
> How do I solve this problem?
> 
> Cheers,
> Carsten
> 
> 
> 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System