Re: pvlist does not find all servers in network

[Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>]

Hello Florian,

First, the usual questions.  Which versions of epics-base and associated modules are involved?  Including pvDataCPP, pvAccessCPP, and pva2pva if built as separate modules.  Do you set any of the EPICS_PVA* environment variables?

On this MPOD crate.  Is there only the one IOC process?  fyi. you can add '-p' to 'netstat' and it will tell you which PID each socket is associated with.

As Andrew mentioned.  Setting $EPICS_PVA_DEBUG=3 will turn on a fire hose for logging.

From the output provided, PVXS is not present.  You might also try "pvxlist" and/or "softIocPVX" to see if the behavior differs.

On 1/27/26 4:02 AM, Florian Feldbauer via Tech-talk wrote:

Hey all,

I have a strange problem, that I haven't encountered before.

In our lab we have a small test setup for our pixel sensors.
As HV/LV power supply for these sensors we use a Wiener MPOD crate with an iseg Crate Controller.
The crate controller is running Linux (The Ångström Distribution v2017.12) and an EPICS IOC with PVA.

Now, when I run `pvlist` from another PC I see a list of all the IOCs running in this network except the one on the iseg Crate Controller.
When I explicitly run `pvlist iseg-iCS2-5230317` I get a list of all PVs from that IOC, so PVA communication works in general, but for some reason this IOC is not reacting on broadcasts.

I checked with netstat and for me this looks correct:

root@iseg-iCS2-5230317:~# netstat -tuln | grep 5076
udp        0      0 224.0.0.128:5076        0.0.0.0:*
udp        0      0 192.168.10.255:5076     0.0.0.0:*
udp        0      0 192.168.10.22:5076      0.0.0.0:*
udp        0      0 224.0.0.128:5076        0.0.0.0:*
udp        0      0 192.168.10.255:5076     0.0.0.0:*
udp        0      0 192.168.10.22:5076      0.0.0.0:*
udp        0      0 :::50767                :::*

There is no firewall running on the crate controller.

Any idea what could cause this issue?

Cheers,
Florian