Networking
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Why Your Laptop's IP Isn't Your Public IP
My laptop says 192.168.1.5 but Google sees a totally different IP?
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Lesson notes
Takeaway: NAT lets many private devices share one public IP using port mappings.
Quick check: What does a NAT router use to send replies back to the correct internal device?
- The device's MAC vendor code
- A table mapping port numbers
- The DNS server's cache
NAT records each connection's port so returning traffic maps to the right private IP.
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