WL500g as a home gateway

[rigips]

Hello.

I intend to use my Asus router as a home gateway, but i can't; seems to be a problem with the WAN interface.

I set the following settings:
- operation mode: "Home gateway"
- WAN interface (static configuration received from the ISP)
IP: A.B.C.D
Subnet: 255.255.255.0
Gateway: A.B.C.1
- LAN interface
IP: 192.168.1.4
Subnet: 255.255.255.0
- DHCP according to the above config.

When i connect to the router with a computer from LAN, it receives the correct config:
IP: 192.168.1.200
Subnet: 255.255.255.0
Gateway: 192.168.1.4
but it doesn't work.

I can ping the 192.168.1.4 & A.B.C.D IPs, but i cannot reach A.B.C.1 and therefore the internet doesn't work.

What can i do anything else? I tried static routing but that didn't help either... maybe i did it wrong, does anybody has an example for this?

Thanks a lot!

[rigips]

Below is the Kernel IP routing table shown after running route in the http://my.router/Main_AdmStatus_Content.asp page

Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 br0
A.B.C.0 * 255.255.255.0 U 0 0 0 eth1
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default A.B.C.1 0.0.0.0 UG 0 0 0 eth1

[max2950]

Is the A.B.C.D WAN IP in the same IP class than the LAN IP ?