merging 2 Internet connection

Configure a second interface in the address range of the new connection and then configure appropriate static routes and policies to allow traffic flow. You will need to look into setting the priorities to ensure traffic hits the right route first! Good luck!

Under router... First thing I would do is make default routers for wan 1 and wan 2 set the WAN1 and WAN2 to DIFFERENT " Priority" and the same " Distance" Set WAN 1 Distance to 10 and Priority to 700 Set WAN 2 Distance to 10 and Priority to 800 so you will have 2 entries IP = 0.0.0.0/0.0.0.0 gateway = X.X.X.X device = Port 1 Distance = 10 Priority = 700 IP = 0.0.0.0/0.0.0.0 gateway = X.X.X.X device = Port 2 Distance = 10 Priority = 800 This will force the Fortinet to choose WAN 1 by default... (For now) This allow you to make rules, and quickly route traffic back to wan 1 if you mess it up... Then make identical rules for all rules that go out WAN 1 and WAN 2 Under Router - Static - Settings = choose the way you want to load balance the two circuits. I' d start on source IP based. From there you can now go back and give both WAN 1 and WAN 2 the same Priority... If you have servers published on WAN 1 and wish to publish them on WAN 2, publish them just like you did on WAN 1. Make sure the same rules outbound are made, and in the same order. Example - Mail server nat' d behind WA1 1 NAT rule may need to be above other rules.... Same applies to WAN 2 Use policy routes if you wish to force email a specific way Once working you can use Dead Gateway Detection to pull routes and drop a route (wan1 or wan2 default gateway) if the link goes down... Just a quick summary... may be another, easier way, but the above works for me. (I use weighted Load Balance as my links are different sizes)

could you tell me which menu should I choose for your suggestion? thanks

Under the router section. Router - Static - Static Route Router - Static - Settings

what is the meaning of :

Then make identical rules for all rules that go out WAN 1 and WAN 2 Under Router - Static - Settings = choose the way you want to load balance the two circuits. I' d start on source IP based.

I Have set like this : Destination IP/Mask : 0.0.0.0/0.0.0.0 Device : wan1 Gateway : 117.102.222.xxx Distance (1-255) : 10 Priority (0-4294967295) : 700 and Destination IP/Mask : 0.0.0.0/0.0.0.0 Device : wan2 Gateway : 117.102.222.xxx Distance (1-255) : 10 Priority (0-4294967295) : 800 But still doesn' t working please help me..thanks

I dont think they can both go to the same default gateway...