How to forward all traffic on one IP-addres
Example:
All IP prom 10.10.10.0/24 forward to 10.10.10.2
/ip route add address=0.0.0.0/0 gateway=10.10.10.2 routing-mark=my_mark disabled=no
/ip firewall mangle add chain=prerouting action=mark-routing new-routing-mark=my_mark disabled=no