Re: Restricting ports/services to specific interfaces

>I should probably also mention that I believe the root of the problem lays
>with the bridges/routers, possibly frame type conversion issues. But they
>are IBM ones no longer being made, no one here knows much about them, and
>the company that installed and configured them is kaput. (They are budgeted
>for replacement next year, until then we're holding our breath).  So
>anyway, I'm trying to resolve the problem by forcing the AS/400 to behave
>differently.

Can you let us know something about the network layout?  What IBM network
equipment? 2210? 8229?

If the connections are routed, then you will need different subnets on each
segment.
If the connections are bridged, then each segment would usually share the
same subnet.


>I gave an interface on the T/R line a different subnet mask.  Every PC
>beyond the bridges/routers which has a static IP address (there are many -
>we use it to control Internet access) abruptly quit communicating.  As soon
>as I deactivated the interface, they started again.  Perhaps, I did it
>wrong.
All devices on the same subnet should have the same subnet mask - otherwise
strange and nasty things can happen.

--
Mike Buglass
Technical Consultant
DCS eIntegration
Nottingham, England



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