How to use different gateways for different IP addresses when connected to multiple gateways - Win7

Question

My office has a LAN and a Open ADSL (without proxy) via WIFI. Though I'm connected to both I can't use them same time. So How am I edit and add routes so for specific ips uses different gateways. I found this article which I don't understand it well.

Configuring multiple gateways on a network

Answer 1

Say your LAN has gateway 192.168.0.1(i.e. IP are in the range 192.168.0.xxx) and WIFI has gateway 192.168.1.1(i.e. IP are in the range 192.168.1.xxx)

use this at command prompt:

route -p add 192.168.0.0 mask 255.255.255.0 192.168.0.1 metric 1 if 20
route -p add 192.168.1.0 mask 255.255.255.0 192.168.1.1 metric 2 if 21

Interface index(20,21) says, which interface to use for each route. Interface index is seen at route print

After adding use

route print

and check if the routes have been added.