Re: TCP and UDP port numbers fr multiple IOCs

[Andrew Johnson <anj@aps.anl.gov>]

Hi Hovanes,

On 05/21/2014 05:19 PM, Hovanes Egiyan wrote:
> The PVs from these softIOCs need to be accessed from another network in
> our lab that
> happens to be behind a firewall for security reasons. If we can assign
> the TCP address manually then the network administrator only needs to open
> a dozen (or two) predefined port #s between the two different firewalled
> networks, otherwise
> we apparently need to have the whole ephemeral port # range open between
> the networks ,
> which is a possibility too. There was a  similar question back in 2008
> according to
> techtalk, and it seemed that such a thing might get implemented, but I
> do not
> think the EPICS base version we are using has that capability yet.

This sounds like you should look at using a PV Gateway, configured
across the two subnets if your security guys will allow it, but not
necessarily if they'd rather do the hole punch. The gateway should
probably live on a different host where it gets to use the regular 5064
TCP port number, and it forwards the requested PVs to the firewalled
clients. You can configure which PVs are allowed through, and whether
writes are allowed etc.

Here at the APS we run PV gateways to allow all our experimental
beamlines to access selected PVs from the accelerator control system;
each beamline gets its own gateway between their subnet and the central one.

- Andrew
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