NAT64, IPv4 NAT or No Translation?

About this interactive

From the lesson: - **IPv6 does not need NAT** to reach the world. Its address space is huge, so each host that talks to the internet gets a global unicast address of its own. Unique local addresses play the part of private addresses inside a company, and are never translated to global ones; there is no IPv6-to-IPv6 NAT for reaching the internet. - **NAT64** translates between IPv6 and IPv4, so IPv6 segments can reach IPv4 ones while a network moves to IPv6. - **IPv4 NAT**, the rest of this module, translates private IPv4 addresses to public ones on the way to the internet. Hosts on the same side, with the same IP version, talk without translation.

What you'll learn

Decide whether a connection needs NAT64, IPv4 NAT or no translation, from the IP versions and the kind of addresses at each end
Explain that IPv6 hosts use global unicast addresses directly, that unique local addresses stay inside, and that NAT64 joins IPv6 and IPv4 segments

Aligned to

Cisco CCNA

4.1 Configure and verify inside source NAT using static and pools

1.9 Describe IPv6 address types

Key terms

NAT64: A transition mechanism that translates between IPv4 and IPv6 addresses, enabling communication between IPv4-only and IPv6-only network segments.
Network Address Translation: A method that maps private IP addresses to a public IP address, allowing multiple devices to share a single public IP.
Global Unicast Address: A publicly routable IPv6 unicast address beginning with the prefix 2000::/3, equivalent in role to a public IPv4 address, used to identify a device uniquely across the internet. GUAs are assigned by ISPs and regional internet registries and are the addresses used for internet-facing communication in IPv6.
Unique Local Address: An IPv6 address in the FC00::/7 range (most commonly FD00::/8) used for private internal network communication, analogous to IPv4 private address ranges like 192.168.0.0/16. Unique local addresses are not routable on the public internet but can be routed within an organization's own network.
Dual Stack: A network configuration that enables a device to operate with both IPv4 and IPv6 addresses simultaneously on the same interface.

Topics

Nat Nat64 Ipv6 Ipv4 Ipv6 Transition Interactive Categorize

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