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NAT (Network Address Translation)
NAT (Network Address Translation) Private IPs (like 192.168.x.x) cannot go on the internet. NAT lets many devices share one public IP . The router changes the sender address from private to public. The router keeps a NAT table . It remembers which inside device asked. Reply to 198.51.100.7:61001 → g
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What this card says
What is NAT?
Private IPs (like 192.168.x.x) cannot go on the internet. NAT lets many devices share one public IP.
The router changes the sender address from private to public.
How replies come back
The router keeps a NAT table. It remembers which inside device asked.
Reply to 198.51.100.7:61001 → goes to laptop 192.168.1.10
Security points
NAT is not a firewall. It only changes addresses. You still need firewall rules.
In logs, one public IP can mean a whole office, not one person.
Learn more in the lesson: 1.8 NAT (Network Address Translation)