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<== Date ==> <== Thread ==>
Subject: IOC in Docker not responding to caget from another host
From: "Paduan Donadio, Marcio via Tech-talk" <tech-talk at aps.anl.gov>
To: EPICS tech-talk <tech-talk at aps.anl.gov>
Date: Thu, 28 Oct 2021 02:54:31 +0000
This is the scenario:

In HostA I have one container running an IOC and another container with caget/caput installed. Both containers have these env variables defined:

EPICS_CA_ADDR_LIST=127.255.255.255
EPICS_CA_REPEATER_PORT=5065
EPICS_CA_SERVER_PORT=5064

I can caget in one container and receive data from the IOC. When both are in the same host it works well. With tcpdump I can see the traffic between the two containers, using localhost to communicate.

The containers are running with network host mode.

Now I want to run caget in HostB that is in a different network. In HostB I've defined:

EPICS_CA_ADDR_LIST=134.79.219.255
EPICS_CA_REPEATER_PORT=5065
EPICS_CA_SERVER_PORT=5064

With tcpdump in HostA, I can see that 5 caget requests arrive from HostB to HostA, but the IOC doesn't seem to be aware of the packages. I understand that the IOC responds to broadcast requests coming from any of the interfaces by default. Is that right?


Any clues? If you need more data, I'm happy to add them to this thread.

Thank you,


Márcio Paduan Donadio | Control Systems Engineer

Advanced Control Systems Department

SLAC National Accelerator Laboratory | Menlo Park, CA

p: 650.926.5007 | w: slac.stanford.edu
Replies:
Re: IOC in Docker not responding to caget from another host Florian Feldbauer via Tech-talk
Re: IOC in Docker not responding to caget from another host Pete Jemian via Tech-talk
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