Network Address Translation
By default your firewall block/drop incoming connections not initiated by you because it doesn't know for which LAN devices this connection is for, so with NAT forwarding you tell your router hey if you receive a packet at this port of WAN ip then forward it to X local device and port.
192.168.1.5 is your LAN ip, your WAN ip would what you see here What Is My IP Address? IP Address Tools and More
By default your firewall block/drop incoming connections not initiated by you because it doesn't know for which LAN devices this connection is for, so with NAT forwarding you tell your router hey if you receive a packet at this port of WAN ip then forward it to X local device and port.
192.168.1.5 is your LAN ip, your WAN ip would what you see here What Is My IP Address? IP Address Tools and More
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