multi homed linux router configuration

Dear list,

I may be permitted to open a new thread. I have found the exact terminology which I am actually trying to achieve. It is " multi homed linux router" .
By any luck; any one of you have a working iptables+iproute2 configuration to achieve this ?

I have found
http://blog.khax.net/2009/11/28/multi-gateway-routing-with-iptables-and-iproute2/
but now I am so much confused now :-(
What is your though on this guide ?

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