how to use SuSE11 as a router between WAN & LAN?

[x2015-0706]

Hi, I have a question about networking setting.

Here is my condition:
I have a static IP address assigned by ISP,
and I have a small local area network for 3~4 computers ( using 192.168.0.x ).
Now there are 2 lan cards in a desktop installed SuSE11, and they both work.

eth0, it connects to the static IP :


eth1, connects to my little local-area-network :

it has been assigned 192.168.0.254 .



Those computers on LAN can reach 192.168.0.254, but they can not reach the Internet via SuSE desktop.
This SuSE11 desktop can connect to Internet , but didn't provide forwarding for computers on LAN.
Please help me about the settings.

I will post other YaST network setting pages below for reference.

[x2015-0706]

I think it's allright in this page :

.

in this page I just keyin the DNS provided by my ISP :

.

default gateway is right, and I enable the IP Forwarding, but it did not forward anything for computers on LAN.
I think I should add something into the "Routing Table" ....


I have tried several times but actually I didn't know what I was doing.
With my blind try, of course it does never work.
This is the popup window after clicking the "Add" button above :




I try to describe my problem as good as I can, but I am not sure is my description clear enough.
Please tell me what i should provide furthermore if I miss something important about this question.