Re: CSS : Multiple IOC pv(s) disconnect on ethernet unplug

["Kasemir, Kay" <kasemirk@ornl.gov>]

Hi:

I believe this is related to the general multiple-IOCs-on-same-computer problem, https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Configure_Channel_Access

With
 EPICS_CA_ADDR_LIST = IP-of-that-server
you only get the IOC that was started last.
Same with
 EPICS_CA_ADDR_LIST = 127.0.0.1
You get the local IOC that was started last on the local computer.

You must use
 EPICS_CA_ADDR_LIST = broadcast-address-that-includes-that-server
to get all IOCs that are running on a computer.

With
 EPICS_CA_ADDR_LIST = "127.0.0.1 broadcast-address-that-includes-myself"
you get all IOCs on the local computer, but it's likely going 'over the network', even for the local IOC, since it would only find one of them via 127.0.0.1.

If the network cable is disconnected, I'm not sure if you might still be able to reach yourself via your own network interface.
Maybe the network kernel somehow decides that the interface is not connected, so it can't "work", and also doesn't handle broadcasts from the local computer to the local network interface?

-Kay

On Apr 4, 2014, at 1:37 PM, Sud Roy <sud.roy@tcs.com<mailto:sud.roy@tcs.com>> wrote:


Hi Everyone,

I am using two IOC(s) on same system and able to get pv data from both IOC on system and over network as well.

I am using CSS ( Control system studio) for GUI on same system, able to get/set pv value from it.

Trouble arises when I unplug ethernet cable from my system running these two IOC(s),immediately all CSS widgets shows "disconnected" .

I already configured CSS Channel addr list to "auto", else added "localhost" on the list (though checked auto addr list check box) ,same I did for EPICS environment variables .

Is there anything else has to be done so that even on ethernet unplug all pv(s) from both IOC would survive on CSS ?

Please guide if am missing something or configured CSS or EPICS incorrectly.


Thank you.

Best regards,
Sudeep Roy