/ip firewall filter
add action=accept chain=forward comment="allow connection to 198.138.1.10" src-address=198.138.1.5 dst-address=198.138.1.10 protocol=tcp dst-port=80
add action=accept chain=forward comment="allow connection to 198.138.1.10" src-address=198.138.1.5 dst-address=198.138.1.10 protocol=tcp dst-port=443
add action=drop chain=forward comment="drop all other connection" src-address=198.138.1.5