Experimental Physics and
Industrial Control System

Hello Tech Talk,

We have encountered an issue with pv access when a host running an ioc switch network. The host is a mini-pc and obtains a new ip from dhcp. After the switch, the pvs from the ioc are not accessible with pv access, e.g., pvget. However, the pvs can still be obtained with channel access (both before and after switching network).

Some findings after switching network:
 => Pv access works if the ioc is restarted.
 => Pv access works if executing 'stopPVAServer' and 'startPVAServer' in the ioc shell.
 => Pvget locally doesn't work.
 => pvget to an ioc on a different host on the network works.
 => Channel access continuous to work after switching network.

Versions:
pvAccess server v7.1.6
epics-base v7.0.7

# ioc shell
> pvasr
EPICS_PVAS_INTF_ADDR_LIST = 0.0.0.0:5075
EPICS_PVAS_BEACON_ADDR_LIST =
EPICS_PVAS_AUTO_BEACON_ADDR_LIST = YES
EPICS_PVAS_BEACON_PERIOD = 15
EPICS_PVAS_BROADCAST_PORT = 5076
EPICS_PVAS_SERVER_PORT = 5075
EPICS_PVAS_PROVIDER_NAMES = QSRV local

Has anyone else experienced something similar? Preferably we would like to find a solution so that it is not required to restart the ioc for pv access to work (same as channel access).

Kind regards,

Jim