Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 15 Feb 2011 10:54:26 -0600

On Tuesday 15 February 2011 10:19:04 [email protected] wrote:
> >> 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?

No, the subnets can be different sizes, but all of the machines with 
interfaces on the subnet have to agree about the size of that subnet so that 
all of their broadcast addresses match.  I'm guessing that your eth0 subnet 
hasn't been configured to be the same size on the client machines as it has on 
the server (this machine).  You need to look at the client's configurations as 
well and correct them as necessary and then I think you'll find they should 
connect properly.

- 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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System