Network Address Translation
A router rewrites private source addresses to its one public address, using a translation table keyed by port numbers to route replies back to the right inside host. It conserves IPv4 addresses but breaks unsolicited inbound connections, which is why peer-to-peer apps need hole punching or relays.
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A router rewrites private source addresses to its one public address, using a translation table keyed by port numbers to route replies back to the right inside host. It conserves IPv4 addresses but breaks unsolicited inbound connections, which is why peer-to-peer apps need hole punching or relays.
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