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6 Nat for IPv4 - Coggle Diagram
6 Nat for IPv4
6.2 Types of NAT
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When the session ends, the public address returns to the pool.
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6.4 Static NAT
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Commonly used for servers that need consistent external access (e.g., web, email, or FTP servers).
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Explain the operation of different types of NAT (static, dynamic, PAT).
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Configure static NAT, dynamic NAT, and PAT via CLI.
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6.1 NAT Characteristics
IPv4 address space is limited; there aren’t enough public IPv4 addresses for every device to have a unique routable address.
Private IPv4 address ranges (per RFC 1918) are used internally (e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16).
Private addresses cannot be routed on the internet; to reach the internet, a private address must be translated to a public one.
NAT (Network Address Translation) performs this translation at the border router between the internal and external networks.
Key terminology: “inside” vs “outside” and address types — inside local, inside global, outside local, outside global.
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6.7 NAT64
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Useful during IPv6 transition, allowing IPv6-only clients to reach IPv4 servers.
Unlike IPv4 NAT, NAT64 is not needed long-term because IPv6 provides enough addresses for direct end-to-end communication.