Hi Alan,
On 10/16/2013 09:01 AM, Alan Greer wrote:
I have a headless server (serv01) running two soft IOCs (IOC-01 and IOC-02).
I have another machine on a separate subnet that runs the EDM GUI
applications for those IOCs.
caRepeater is running on serv01.
caRepeater is only used by CA clients running on the same machine, so
that won't help this situation at all.
I hope I have explained this with enough detail, can anyone help me so
that the connections to IOC-01 are not lost(?) when running up IOC-02.
Kay's explanation of the problem is correct, but there are alternative
solutions to running a CA gateway.
1. You could run a CA Nameserver in the GUI subnet which knows about the
IOCs and responds to search requests; in this case you would *not* set
the EPICS_CA_ADDR_LIST variables. This is almost equivalent to running a
CA Gateway, but is slightly more robust in that if the Nameserver
process dies it wouldn't kill any existing connections.
2. If you have access to a machine with a network interface on both
subnets you could also try running a program on it called UDP Broadcast
Packet Relay https://www.joachim-breitner.de/udp-broadcast-relay/ which
forwards broadcast packets between subnets. You would probably have to
run it twice, once on port 5064 and once on 5065; the first one will
forward CA search requests between the subnets, and the second sends the
CA beacons. If you do have success with this please let us know, we use
it here at the APS for forwarding timing UDP packets but not for CA.
- Andrew
--
Advertising may be described as the science of arresting the human
intelligence long enough to get money from it. -- Stephen Leacock
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