[SLE] Firewall zones

I want to configure the SuSE firewall so that communication within my LAN is
uninhibited but communication outside the LAN is fully protected. Looking
at the firewall configuration in Yast, I see that the external zone is
protected but the internal zone is not. However, I don't see how to specify
that the internal zone consists of hosts with addresses 192.168.0.x. This
would seem to be a pretty common requirement.

It appears that the firewall configurator can specify that an interface is
external or internal, but I have only one interface (network card). It
connects to the LAN and to the router; the router in turn talks to the world.
It's a very common setup.

Paul

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