At 17:34 22.11.2001, you wrote:

>                         Dual homed host
>Laptop <--> Hub <--> NIC0 <--> NIC1 <--> Target System
>
>Thinking I need set the dual homed host as a bridge, then install the 
>firewall.

I don't know if it is possible to solve your problem with this bridged 
scenario, but I can give you a different hint:
On the Linux-box do portforwarding (and filtering) for the RISC/6000. You 
don't have to change any IP-Adresses, but you need to adapt your 
application settings - they have to access the Linux-box instead of the 
RISC/6000. (You also could give the Linux-box an additional IP exclusively 
for this use and do some more logging on this IP).

The only thing that could get a little bit ugly is the routingtable on the 
linux-box (I think you have to insert all hosts on your network explicitely 
for NIC0 and the RISC/6000 box for NIC1).

I would recommend using iptables instead of ipchains for this. It is not 
this much effort for learning iptables and you get stateful filtering which 
is quite powerful.

greetings,

Matthias

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