Experimental Physics and
Industrial Control System

Hi Jeff,

Wonderful!  Please add this to R3.15 especially if you are under the hood making other CA changes.  

Thank you VERY much,

Stephanie

> -----Original Message-----
> From: Jeff Hill [mailto:[email protected]] 
> Sent: Monday, April 28, 2008 4:29 PM
> To: Allison, Stephanie; 'EPICS Tech-Talk'
> Subject: RE: Multiple IOCs on the same Host - question on 
> dynamically allocated TCP Ports
> 
> Hello Stephanie,
> 
> The specific of how this gets configured would need to be 
> worked out, but
> this does appear to be a good idea. If you would like I could add your
> request as a Mantis entry against R3.15 so I have a reminder 
> to look at this
> sometime before R3.15 gets released?
> 
> Jeff
> 
> > -----Original Message-----
> > From: [email protected] 
> [mailto:[email protected]]
> > On Behalf Of Allison, Stephanie
> > Sent: Monday, April 28, 2008 11:04 AM
> > To: EPICS Tech-Talk
> > Subject: Multiple IOCs on the same Host - question on dynamically
> allocated
> > TCP Ports
> > 
> > Hello,
> > 
> > When multiple IOCs run on the same host, using the same
> > EPICS_CA_SERVER_PORT, they use the same port for UDP 
> channel connection
> > requests but have to use different ports for the CA TCP 
> connection (of
> > course).  The CA reference manual says:
> > 
> > "If the CA server library detects that a server is 
> attempting to start on
> > the same port as an existing CA server then both servers 
> will use the same
> > UDP port, and the 2nd server will be allocated an ephemeral 
> TCP port."
> > 
> > Is there a way to set the allowable range of TCP ports that 
> the IOC is
> > allowed to choose from for its TCP port?  In particular, on 
> a RHEL4 linux
> > server.
> > 
> > The reason for this is that we wish to have some of our CA clients,
> outside
> > our firewall, connect directly to IOCs (both RTEMS and 
> linux) inside the
> > firewall.  We don't want them to go through a CA proxy 
> gateway process and
> > we don't want to have to set their EPICS_CA_ADDR_LISTs to include
> different
> > EPICS_CA_SERVER_PORT values.  We also don't want to open up 
> our firewall
> to
> > all TCP ports just to allow this communication but are 
> willing to allow a
> > small range of predefined TCP ports.  And we don't want to 
> combine our
> IOCs
> > into one.  Essentially, we want each soft IOC to use the same
> > EPICS_CA_SERVER_PORT for UDP connection requests but a 
> predefined port for
> > the TCP connection (ie, a new environment variable like
> > EPICS_CA_SERVER_TCP_PORT which would be set differently in 
> each of our
> soft
> > IOC startup files).
> > 
> > Any thoughts?  Thank you,
> > 
> > Stephanie Allison
> 
> 
> 

References:

Multiple IOCs on the same Host - question on dynamically allocated TCP Ports Allison, Stephanie

RE: Multiple IOCs on the same Host - question on dynamically allocated TCP Ports Jeff Hill

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