The following are example of my rules:
1 drop_smb-all Drop lan lannet wans all-nets smb-all
2 allow_http NAT lan lannet wans all-nets http-all
3 allow_dns NAT lan lannet wans all-nets dns-all
4 allow_ntp NAT lan lannet wans all-nets ntp
In the Interface Group under Interfaces I made a group called wans which is compose of wan1 and wan2.
With this configuration the traffic transfer automatically from the wan2, but as I said you have to manually remove the cable from wan1 port to be able to detour the traffic.
may you have some ideas or suggestion regarding my problem.