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NAPT: Network Address Port Translation |
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Also called Port Address Translation (PAT) |
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192.168.1.10:3333 connects to 192.18.99.175:80 |
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Let actual Internet address be 68.160.106.71 |
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Router can map 192.168.1.10:3333 to 68.160.106.71:1029 |
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When a packet comes back it can reverse the translation |
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NAT doesn't translate the port numbers, just the address. NAT usually means NAT/PAT or NAPT. |
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If a packet arrives for a port not in the table, it can be discarded. This makes NAPT into a security feature. Vendors like Linksys call this a firewall. |
