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DNAT (Port Forwarding)SNAT / Masquerade

External (WAN)

Public IP

Public Port & Protocol

Internal (LAN)

Private IP

Private Port

MikroTik RouterOS

/ip firewall nat
add chain=dstnat action=dst-nat to-addresses=192.168.1.50 to-ports=443 protocol=tcp dst-address=1.1.1.1 dst-port=443 comment="Port Forward 443 -> 192.168.1.50"

FortiGate (FortiOS)

config firewall vip
    edit "VIP_443_to_192.168.1.50"
        set extip 1.1.1.1
        set mappedip "192.168.1.50"
        set extintf "any"
        set portforward enable
        set protocol tcp
        set extport 443
        set mappedport 443
    next
end

config firewall policy
    edit 0
        set srcintf "any"
        set dstintf "any"
        set srcaddr "all"
        set dstaddr "VIP_443_to_192.168.1.50"
        set action accept
        set schedule "always"
        set service "ALL"
    next
end

Linux iptables

iptables -t nat -A PREROUTING -d 1.1.1.1 -p tcp --dport 443 -j DNAT --to-destination 192.168.1.50:443
iptables -A FORWARD -p tcp -d 192.168.1.50 --dport 443 -j ACCEPT

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