NAT saved IPv4, the 3 RFC1918 ranges explained simply

NAT and PAT power almost every home and enterprise network. In this video I show you, step by step, how private RFC1918 addresses are translated to public addresses, why IPv4 exhaustion forced us to use NAT, how Cisco’s inside-local and inside-global terms actually map to packets, and I prove it all live with Wireshark and tshark.

You’ll learn:
• NAT vs PAT in plain English
• The three RFC1918 ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
• Why IPv4 ran out and how NAT delayed disaster
• Why ISPs block private ranges on the internet
• IPv6 usually doesn’t need NAT
• Cisco’s inside local, inside global, outside local, outside global explained with a capture
• Packet-by-packet proof using Wireshark and tshark
Perfect for CCNA students, junior network engineers, and anyone who wants to finally understand what their router is doing.

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// MENU //
0:00 – Intro
0:40 - Looking at the IP Address
01:37 - Carrier-Grade Nat
02:50 - Private & Public Addresses
04:43 - Class A Addresses
05:15 - Running Out of Addresses
06:50 - What Stops Access to the Internet
07:50 - Terms you Should Know
09:30 - Terminology (Topology)
14:53 - Practical Demo Starts
16:25 - Capturing Traffic
18:49 - Conclusion

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Disclaimer: This video is for educational purposes only.

#ccna #networking #nat