Question about PVaccess and docker

[Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov>]

Hey all,

we use docker to manage and distribute our IOCs.

Assume the following:

I have two PCs connected via LAN.
On PC A I ran a docker container containing an IOC
ON PC B I try to access PVs of this IOC via caget/pvget (locally installed).

If I start my docker container with the `--network host` option (the 
container uses the network of PC A), both caget and pvget are working fine.
But if I use the Docker's default bridge network and map the ports of 
the container to the ports on PC A (`-p 5064:5064 -p 5064:5064/udp -p 
5075:5075 -p 5076:5076/udp`) only caget works.
The ioc does not reply to any request on port 5076/udp
I also tried to use pvlist which returns nothing. But `pvlist <IP of PC 
A>` works.
I used wireshark to check. The only difference in these two scenarios I 
can see are broadcast messages send regularly by the ioc to ports 
5065/udp and 5076/udp.
This difference is to be expected, as network bridges do not forward 
broadcasts, so these are only visible in the 1st case.
Any idea why pvget/pvlist cannot connect with my ioc if I use the `-p` 
options when starting the docker container?
Best regards,
Florian

--
Ruhr-Universität Bochum
AG der Experimentalphysik I
Dr. Florian Feldbauer
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