If you have 2 ISP's coming on a single router, you can use policy based routing and NAT to acheive to send traffic over both the links.
You have to segregate the traffic over these two links. i.e Either based on few inside networks or the traffic that is originating from your network you can load-balance the traffic over the links. For example you can segregate the traffic based on few vlans i.e. vlan1 and vlan2 will use the ISP1 link and vlan3 and vlan4 will use the ISP2 link.
Another example, use ISP1 link for FTP and mail traffic and other link for internet traffic.Use PBR to acheive this and then use NAT on the router to enable the natting.
I agree with Amit, actually if you have a dual link to Internet, its kind of a difficult to achieve the true load-balancing and load-sharing effect without a specialized device (e.g. F5 or Radware Linkproof).
The easiest way to achieve this would be to have your Source Traffic split into two and based on the PBR you can achieve the Load Sharing effect.
If you require any further information, please feel free to get back to us.
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