Hi,

I'm newbie into linux. Just set up a Fedora Core 3 box, and now i'm strugling to get iptables configured.

I'm using fwbuilder, and for now i was able to set part of my job.

My linux box has 2 nic iterfaces and it is behind a linksys router. I wan't to stop using the linksys firewall and change it to the linux box.

my nics are set to 192.168.150.1 (inside) and 192.168.50.1 (outside). The entire network is on the 192.168.50.

I only can get it to work if the linksys is on the same class (192.168.50.) than the internal lan. My intentions were to assign the linksys a 192.168.150.x address and use the linux box to forward trafic form the lan to the linksys.

Used fwbuilder and created a NAT rule like this

ORIGINAL SRC: 192.168.50.x
ORIGINAL DEST: ANY
ORIGINAL SRV: ANY
TRANSLATED SRC: outside
TRANSLATED DEST: ANY
TRANSLATED SRV: ANY

Where outside is the linux nic for the 192.168.150.x network.

Can someone helpe me ?

Outside should be the firewall itself using the external IP. As I understand you are using the inside IP, but you want everything coming in from the router to be translated to the local network and vice versa.

Outside is the firewall "external" ip (something like 192.168.150.1) the linksys router is on 192.168.150.100 and it has the DSL connection. I also want to be able to access the linksys control pannel from the lan

Note:

I want everyting comming from the inside network 192.168.50.x to be forwarded to the router 192.168.150.100 using the firewall (192.168.50.1 and 192.168.150.1)

I want just a few ports comming from the internet through the router (192.168.150.100) to be forwarded to specifique computer in the internal network (192.168.50.x) using the firewall (192.168.50.1 and 192.168.150.1)

well you should consider connecting DSL to your primory NIC and there's no need to do all that NAT use just IP MASQ for 2nd NIC