Experimental Physics and
Industrial Control System

I will certainly take a look at NX then, as well.  As far as IOCs and
the network setup, I'm not too sure.  To be honest, I am fairly new to
the world of EPICS, and this is the first time I've had to worry about
the networking side of things.

As far as the netcat utility, I have actually used it and found it
quite useful in the past.  Yesterday my searches led me to a website
with a few netcat commands for forwarding UDP over TCP, but
unfortunately I didn't have any luck with them.  Perhaps I'll have to
try again.

Thank you for your suggestions!
Doug Sheffer

I do something very similar but with a nx server/client architecture.
Have a look at freenx and nxclient (nomachine.com)
The idea is that you do not forward the PV directly, but a display with
the values of the PV. The nx protocol is TCP based, use ssl encryption
(over ssh), and use compression.
With a gateway over the internet, you will probably lose most of your
UDP datagrams anyway, plus there is the network latency, etc.

I heard that a secure epics gateway is being developed though.
How far are you from the IOCs ?

--
Emmanuel Mayssat

On Fri, 2007-06-08 at 15:09 -0400, J. Lewis Muir wrote:
> Doug Sheffer wrote:
> > Hello!
> >
> > I was wondering if anyone has experimented and had good luck with
> > accessing real-time EPICS channel data over the Internet.  Is this, by
> > any chance, something that is possible with the EPICS gateway?
> >
> > Since allowing access over the Internet in any way would inevitably be
> > a large security risk, we would like to be able to use SSH tunneling
> > to secure the connection and to monitor who is doing what with the
> > system.  Unfortunately, SSH seems unsuitable because it only supports
> > tunneling on TCP ports, while EPICS uses both TCP and UDP.
> >
> > Has anyone done anything similar, or got any ideas/suggestions on how
> > to go about doing it securely?
> >
> > Your help is much appreciated.
> > Doug Sheffer
>
> You could use a VPN. It depends on what you want to do. Or maybe you
> have constraints that make this not an option?
>
> -lewis
>

Replies:

RE: EPICS channels via the Internet Jeff Hill

References:

EPICS channels via the Internet Doug Sheffer

Re: EPICS channels via the Internet J. Lewis Muir

Re: EPICS channels via the Internet Emmanuel Mayssat

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