Overview

From Bruce Hill on March 2, 2023:

For DRP we setup two additional gatewaysthis gateway:
drp on pscag03 serving PVs from 172.21.155.255 subnet to hutches
drpneh on pscag04 serving PVs from 172.21.159.255 (a.k.a. the "152" subnet) subnet to hutches

Clients on daq-drp.pcdsn and daw-drp-neh.pcdsn hosts (the "152" subnet) are able to directly
access hutch PVs using our standard EPICS_CA_AUTO_ADDR_LIST=YES
via any of the pscag0* hosts which all have interfaces for these subnets.

In late 2023 ports were open so that ACR and S3DF can access DAQ EPICS across subnets without a gateway using EPICS_CA_ADDR_LIST and EPICS_PVA_ADDR_LIST (cpo has notes on how to do this from ACR, need to put those notes here).

We propose to export DAQ:NEH:tmo (read-only) from the tmo gateway.  This is for variables like DAQ:NEH:tmo:0:DeadFrac created by the prom2pvs process.  We also export DAQ:NEH:XPM (read-write) from the drp gateway so that control-level processes running on machines like tmo-daq can program XPM's.