Well, I can see the packets getting to the router. When I go to "connections", the "TCP State" is "syn sent" with a "U" for "unreplied" instead of "A".

I have a customer who is rolling out new web-based software that requires we open LPR printing (port 515) from a printer on the LAN to the WAN. All connections looking for WAN:515 should go to LAN:515. My WAN IP is: 71.6.55.226 The LAN IP of printer is: 10.0.0.10 I didn't set up this Mikrotik origin...

Thnks very much. am not familiar with CLI, I use winbox. I will appreciate if u can interprete it

if you click "new terminal" in winbox, you can type in those commands.