Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 26 Jun 2013 17:20:27 -0500

Hi Brian,

On 2013-06-26 Brian McAllister wrote:
> The host system has two NICs, one for the facility network and a private
> one for these devices.
> 
> The IOC runs.  It connects to the devices and successfully communicates
> with at least one of them.
> 
> However, when I try to use "caget" on the host to access the IOC channels,
> it just times out.
> 
> lsof shows:
> istCoolin 5489 epicsdev    9u  IPv4 136863      0t0    TCP *:ca-1 (LISTEN)
> istCoolin 5489 epicsdev   10u  IPv4 136864      0t0    UDP
>  asym.mit.edu:33586->172.18.0.255:ca-2 istCoolin 5489 epicsdev   11u  IPv4
>  136865      0t0    UDP *:ca-1
> 
> 
> I have used soft IOCs before without any such issues but they were in a
> single-network environment.

Do you have EPICS_CA_ADDR_LIST and/or EPICS_CA_AUTO_ADDR_LIST set in the 
environment that's running caget?  If so, what are they set to?

Usually the problem when running both client and server on a dual-NIC machine 
is that you get duplicate replies to the search requests which generates 
warning messages from the client library.  To avoid that you have to tell the 
client to only search one of the networks by setting the above variables.  
Maybe that has already been done without your knowledge, but it hasn't been 
done quite right?

- Andrew
-- 
Advertising may be described as the science of arresting the human
intelligence long enough to get money from it. -- Stephen Leacock

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System