Multi wan only as failover

[RpR]

Hi,

I have 2 internal networks and 2 external networks.
Both have a 1 wan.

Now I want to implement 1 firewall with 4 network ports (2 wans and 2 seperate lans) and make WAN1 gateway for LAN1 and WAN2 for LAN2 and LAN1 only use WAN2 if WAN1 is down.
Basicly I want to prevent that LAN1 can saturate both internet connections.

Anyone has some insight in this methode?

[Perry]

http://doc.pfsense.org/index.php/Multi-WAN_Version_1.2.x