[FW1] Multiple WAN Links.

[Gunjan Mathur at 9netave]

I have two WAN links using PPP with static routes from diff. ISP, Now I want if my one links goes down then automatical second link handel all the things and if both are up then load balancing will happen. and I'm using NATting of my LAN traffic on firewall with one ISP's IP range. If the link of this ISP goes down then all my LAN users are unable to access the net,b'caz of this NATting. How I configure my structure in such a way if one the link of NATting ISP's is down then second link handel the traffic. GM