Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Tue, 15 Feb 2011 09:55:58 -0700

> Yes, the two networks have different subnet masks.
> 
> I have 255.255.252.0 on eth0 and 255.255.255.0 on eth1.

The IOC's server should see clients on both network interfaces. Do you see
beacons emitted on the EPICS network? As root type "/usr/sbin/tcpdump port
5065" on one of the eth1 subnet workstations. 

Make certain that the EPICS clients are using broadcast addresses that match
the subnet mask of eth1.

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
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Message content: TSPA

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> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of [email protected]
> Sent: Tuesday, February 15, 2011 9:19 AM
> To: [email protected]
> Subject: RE: EPICS Config for 2 Ethernet Adapters
> 
> >> The IOC server binds to all the interfaces it can see; there's actually
> no way to change that with the current code.  >> I wonder whether your
> problem is actually that the machines do not have the same subnet mask
> settings, and hence their >> broadcast addresses are different?  On Unix
> systems 'ifconfig -a'
> >> will print the broadcast address; you need to make sure that all
> systems are using the same address.
> 
> Yes, the two networks have different subnet masks.
> 
> I have 255.255.252.0 on eth0 and 255.255.255.0 on eth1.
> 
> I'm no expert on network configuration, does this setup make it a non-
> starter?
> 
> Thanks,
> 
> Graham
> -----Original Message-----
> From: Andrew Johnson [mailto:[email protected]]
> Sent: 15 February 2011 16:08
> To: [email protected]
> Cc: Paul Sichta; Cox, Graham (STFC,DL,EID)
> Subject: Re: EPICS Config for 2 Ethernet Adapters
> 
> On Tuesday 15 February 2011 09:52:37 Paul Sichta wrote:
> > Look in the CA Reference Manual for your release of EPICS.  I think
> > you need to specify EPICS_CAS_INTF_ADDR_LIST .
> 
> Actually that variable has no effect on the IOC server, it only applies to
> the CAS which is not (yet) used by the IOC code.
> 
> > On Tue, Feb 15, 2011 at 10:33,  <[email protected]> wrote:
> > > I now need to take the legacy data from one network and make
> > > available on another network via EPICS.  I have a Linux PC with 2
> > > ethernet adapters, eth0 the legacy control system, eth1 the EPICS
> > > control system.  The IOC runs on this machine except I cannot see
> > > the EPICS PVs via other machines on the eth1 network.
> > >
> > > I'm guessing that the EPICS IOC is binding to eth0 by default and
> > > expecting to serve data to this network?
> > >
> > > How do I configure EPICS to bind to eth1 rather than to eth0, is
> > > this possible?
> 
> The IOC server binds to all the interfaces it can see; there's actually no
> way to change that with the current code.  I wonder whether your problem
> is actually that the machines do not have the same subnet mask settings,
> and hence their broadcast addresses are different?  On Unix systems
> 'ifconfig -a'
> will print the broadcast address; you need to make sure that all systems
> are using the same address.
> 
> The output from running 'casr 1' from the IOC shell may also give some
> hints.
> 
> - Andrew
> --
> If a man is offered a fact which goes against his instincts, he will
> scrutinize it closely, and unless the evidence is overwhelming, he will
> refuse to believe it.  If, on the other hand, he is offered something
> which affords a reason for acting in accordance to his instincts, he will
> accept it even on the slightest evidence.  -- Bertrand Russell
> 
> --
> Scanned by iCritical.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System