Experimental Physics and
Industrial Control System

Kate Feng wrote:

There are two network interfaces (N.I.) on my IOC, each attached
to  a  different  IP address. I  thought one could  decide which medm
clients  "Channel Accessing"  which  N.I. by opening two windows.
Both windows  are set with  EPICS_CA_AUTO_ADDR_LIST = NO.
Window #1 is set with EPICS_CA_ADDR_LIST= IP1, while
window #2  is set with  EPICS_CA_ADDR_LIST= IP2.

Is ther any other better way ?   I wanted to make sure  that certain
clients  CA the specified IP, instead of  the other one.  Thus, I
disconnected
one of the cable going to that specified N.I.  However, when I do that,
all the medm clients on both windows  became disconnected from the IOC.

The two IP addresses must be on different subnets, or the IOC OS's network code is likely to just use one port for all communications to that subnet - display the routing table from the IOC's OS and you may get a clue what it's doing at the moment. Once you've separated the two ports properly into different subnets, your technique of setting EPICS_CA_ADDR_LIST should work as you expect.

you may have to put a couple of "routeAdd"s to the two different subnets
/client machines into the startup file of the IOC as well.

References:

CA for IOCs w/ dual NICs Kate Feng

Re: CA for IOCs w/ dual NICs Andrew Johnson

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