Experimental Physics and
Industrial Control System

Jeff Hill <[email protected]> · Wed, 20 Nov 1996 12:57:15 -0700

Perry L. Anthony wrote:
> 
> We have the following situation.  The accelerator has a Controls Subnet
> and the experiment has a their own Subnet.  We would like to pass
> information between these two subnets, while keeping them seperate.  We
> envision having an IOC (MVME167) with either two e-net interfaces, or
> connected to a router (probably something like a Catalyst 1200 Switch)
> configured to allow the Controls Subnet to access the IOC (epics channel
> access) and to allow the Experiment Subnet to access the IOC, but prevent
> direct communication between the two subnets (to keep experiment traffic
> off the controls subnet).  Does anyone have any experience configuring a
> VxWorks/EPICS IOC as multi-homed (having two interfaces)?  I heard rumors
> some time ago that this might be difficult, but this information might be
> out of date or incorrect.  My experience with UNIX OS's is that
> sometimes it is easy (no problems with motorola's SYSV OS and others) and
> sometimes extremely difficult (IBM's AIX 3.x.x).  How does one configure
> VxWorks/EPICS for two e-net interfaces?  Thanks, Perry

See the CA ref manual for info on multi-subnet configuration of CA.
The CA gateway could also be used if you need a transparent firewall 
between the experiment and controls portions of your system. The
CA gateway can be configured so that PVs on the controls subnet
become virtual PVs on the experimenter's subnet.

Jeff

-- 
______________________________________________________________________
Jeffrey O. Hill                 Internet        [email protected]
LANL MS H820                    Voice           505 665 1831
Los Alamos, NM 87545 USA        FAX             505 665 5107

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System