I would advise trying command below: nat44 plugin enable sessions 63000 nat44 forwarding enable set nat timeout udp 3000 tcp-established 7440 tcp-transitory 2400 icmp 600 set interface nat44 out {wan1} output-feature nat44 add static mapping tcp local 192.168.1.20 external 4.4.4.4 nat44 add interface address {wan1} //replace "wan1" with your wan interface name
just make sure , your default route(fib 0.0.0.0/0) output interface is wan1. if not, just repalce {wan1} with the specific interface name. and if there is no default fib item in your fib table, just check the destination ip address in your fib table with command (sh ip fib X.X.X.X/32),the output info will dispaly the output interface name, make sure the "NAT44 command" with the right output interface name.
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