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Why is IPv6 so spectacular?

5 Answers

  • 1 month ago

    Well, the original IPv4 had 32-bit addresses, which allowed for over 4 billion unique addresses, although some of it is reserved for private networks. 4 billion is not enough these days, if you want the entire planet to be connected via the Internet.

    IPv6 doubled the number of bits, and then doubled it again to 128-bits. That's why there's no IPv5, they skipped right over 64-bits straight to 128-bits. That's enough bits to give every atom in the universe its own unique IP address! You only need 80 bits to represent each atom.

    However, there are certain faults with it. Well maybe not faults, but they change the way we've been doing things currently on the Internet. For example, there is a set of IPv4 addresses that are entirely reserved for use inside private networks. These addresses can be reused from one LAN to another LAN as many times as you like, as long as there is no direct connection between the LANs. But if you want to use the Internet from these private networks, they built a routing scheme called NAT (natural address translation) that allows all of the computers behind a LAN to use the same single full IP address to access various parts of the Internet. This NAT scheme was a very effective natural firewall, effectively protected the LAN from attacks from the outside. This mechanism was not carried over into IPv6, because there's no need for private IP addresses anymore, since there's so many addresses available, you don't need to share. But the firewalling capabilities of a simple NAT are now missing.

  • 1 month ago

    In the early 1990s if you worked at a company connected to the Internet, odds are you were assigned a static - real Internet routable - IP address for your computer.  Conventional wisdom at the time was that the IPv4 addresses would run out, then what?  So the IETF started working on a next generation of IP addressing, where the idea at the time was that there would be a large enough pool of addresses that every person on earth could have several static ones of their own.  

    Since then technologies like NAT and DHCP have helped us limp along on IPv4 as IPv6 was perfected.  

    Additionally IPv6 has evolved such that static addresses will never be assigned, they will always be dynamically assigned.  

    I wouldn't say IPv6 is "spectacular", more that it was allowed to evolve based on 20:20 hindsight based on what has been learned from IPv4.  There won't be a hard cut over to IPv6, it will be something that the Internet user base evolves towards.  

    Parts of the Internet already use IPv6, but they're masked behind an industrial strength NAT that converts IPv6<>IPv4.

    Source(s): Worked in the networking industry for long time.
  • ?
    Lv 7
    1 month ago

    IPv4 has an upper limit of about 4.2 billion addresses max.

    current world population is around 7.8 billion people (and rising).IPv6 has a limit of about 340 trillion trillion trillion addresses.

    it would take an immeasurably long time for world population to reach those numbers.

  • 1 month ago

    It's impossible to memorize multiple IPv6 addresses, unlike IPv4, and they are much more complex overall.

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  • 1 month ago

    It's not.  It just allows for more internet addresses. 

    You sure you know the meaning of spectacular?

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