IPv6 addressing was designed to address the deficiencies in IPv4. It is based on 128-bit hexadecimal IP addresses, which provide a much greater amount of addresses (3.4×10^38 or 340 undecillion) while still meeting requirements to be heirarchical and scalable. So what happened to IPv5? I always assumed IPv4 was so because it used four octets. IPv6 was just logical because it used hex. But that’s just how it worked out. There actually was an attempt at IPv5, but it was never formally adopted as a standard.
- Tremendous amount of address space - trillions upon trillions of addresses
- 128-bits = 32 hex characters to make up an IPv6 address
- No more NAT and PAT
- When integrating or transitioning IPv4 with IPv6 there is NAT64, which facilitates communication between IPv4 and IPv6 devices.
- EUI-64 address - a host can assign itself its own unique 64-bit IPv6 interface identifier, an Extended Unique Identifier. How to calculate an EUI-64 address
PacketTracer Lab: CCNA-1.13-Configure-verify-and-troubleshoot-IPv6-addressing.pkt
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