IPF, NAT or NIC

[Freeco]

So it means that i will need 2 more NIC's in my gateway?

				|---------<pc>
				|
ISP>-----------<Gateway>-----<Switch>-----<pc>
				|
				|_________<pc>

Why all pc's can't be in one subnet? I'll be happy with one subnet, i don't
need more. I tried this:

ISP x.x.88.17>-----------<x.x.88.20 Gateway 192.168.1.2>----------<pc cable
unplugged 192.168.1.7>?

I want to use this one:
                                                                                          
|---------<pc 192.168.1.5>
                                                                                          
|
ISP x.x.88.17>-----------<x.x.88.20 Gateway
192.168.1.2>-----<Switch>-----<pc 192.168.1.6>
                                                                                          
|
                                                                                          
|_________<pc 192.168.1.7> 

The gateway will work like firewall and nat. Maybe i have wrong settings on
my pc?
----PC Settings----
IP: 192.168.1.7
Mask: 255.255.255.128 (same in rc.conf)
Gateway: 192.168.1.2
Dns: x.x.88.17
Dns: 192.168.1.2
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