Re: How to address hosts in dual ethernet networks?
On Wed, Oct 3, 2012 at 8:35 PM, lee <lee@yun.yagibdah.de> wrote:
> What if you actually do make your host a bridge that bridges the two
> networks and let the Modbus devices get their addresses from the DHCP
> server?
Can't. My local "modbus" subnet must not be visible from the outside.
Actually there are several production tools in use here that use
similar subnets with 400+ nodes (=IP addresses) in just the manner I'm
describing. There's no point in exposing all that to the outside
network, and it's also a potential security and reliability issue.
Just imagine a multi-million dollar tool out of production because the
DHCP server is down, when all those modules need to talk to is the
local controller.
> You could also use another private address range like 10.x.x.x for the
> Modbus devices.
Yeah, I'll do something of the sort. As I said, all I need to connect
to on the intranet side is a single host, so I'm sure I'll find an
unused address space ;-)
Thanks,
robert
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