![]() It won't allow anything in unless it came from the original host and port that you originally communicated with, i.e. Moderate NAT is where your router will only accept traffic from the same host, but will allow it to come from any port: Your computer Router In open NAT, any machine on the internet can send traffic to your router's port 21283, and the packet will be sent back to you: Your computer Router Open NAT (aka Full cone NAT, aka the good, right, and correct one) ![]() So the router will relay the packet to your computer: Your computer Router In this case the router has kept a record of you, and it knows that any traffic arriving on port 21283 from the Internet should go to your PC. When Google's webserver sends you back information, it is actually sending it back to your router (since your router is the guy actually on the Internet): Router ╔═══════════╗ ╔════════════════╗Ī packet arrives at your router, on port 21283 from What should the router do with it? ![]() Your router, in turn, establishes a connection to the server you want to talk to. In reality you send packets to your router, going out from your computer on some randomly chosen port: Your computer Router You establish a connection to a server on the internet. It's important first to know how Network Address Translation (NAT) works. ![]()
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