#TechBlogClub by Krittin Srithong

/ip firewall address-list
add address=192.168.50.0/24 list=LAN

/ip firewall nat
add action=masquerade chain=srcnat comment="Internel Hairpin NAT" dst-address=!192.168.50.1 src-address-list=LAN
add action=dst-nat chain=dstnat dst-address-type=local dst-port=80 protocol=tcp src-address-list=LAN to-addresses=192.168.50.100 to-ports=80
add action=dst-nat chain=dstnat comment="External Port Forwarding" dst-port=80 in-interface=WAN1 protocol=tcp to-addresses=192.168.50.100 to-ports=80