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Subject: Re: Questions regarding CA protocol specification and phylosophy
From: "Kasemir, Kay" <kasemirk@ornl.gov>
To: Diego Sanz <dshernan80@gmail.com>
Cc: EPICS Tech Talk <tech-talk@aps.anl.gov>
Date: Wed, 13 Sep 2017 15:20:43 +0000
Hi:

>Starting for the configuration: the 2 IOCs and the EPICS client is in the same Host, no firewall...
>If I understood correctly, every IOC, shall be working in different IPs on different subnetworks? e.g., 
>IOC1 on 192.168.0.2 
>IOC2 on 192.168.1.3
>and client shall have access to booth IPs....

If you just have one host, that host typically has one IP address.
Well, maybe two: The "real" IP address like for example 192.168.0.2 , and localhost 127.0.0.1.

You can run 1, 2 or 2000 IOCs on that host, all using 192.168.0.2.
No, you to NOT need different IPs for every IOC.

You can 
a) Set EPICS_CA_ADDR_LIST to  127.0.0.1 or 192.168.0.2 and reach the IOC that was started last
b) Set EPICS_CA_ADDR_LIST to a broadcast address and reach all the IOCs.

Suitable broadcast addresses would be 127.255.255.255 or 192.168.0.255.

-Kay

References:
Questions regarding CA protocol specification and phylosophy Diego Sanz
Re: Questions regarding CA protocol specification and phylosophy Kasemir, Kay
Re: Questions regarding CA protocol specification and phylosophy Dirk Zimoch
Re: Questions regarding CA protocol specification and phylosophy Diego Sanz

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