best way to forward udp port to jail?

hello
I want use mosh in jail but it needed udp ports
I forward tcp with ipfw
Code:
fwd 10.10.50.3,80 ip from any to xx.xx.xx.xx 80
10.10.50.3,3306 ip from table(10) to xx.xx.xx.xx 3306

I will be grateful for a solution with ipfw or some port
thank you
 
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