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IPv6 Notes

Facts about IPv6

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Please note that this page is not complete and is lacking information. It will be completed soon.

This is a compilation of notes regarding IPv6. Each group of notes will be under a specific header for easier reference.

IPv6 - In General

  • IPv6 provides 128-bit source and destination addresses compared to 32-bit addresses with IPv4. This represents an extremely large, to put it lightly, number of addresses, 2128 or roughly 340 trillion, trillion, trillion addresses.
  • IPv6 provides a configuration mechanism where hosts can self-generate a routable table. IPv4 autoconfigured addresses are usable only on the local subnet and are never forwarded by a router. Stateful auto-configuration using DHCPv6 is an option in IPv6.
  • Because of the large number of public addresses with IPv6, there is no longer a need for Network Address Translation, (NAT) or Port Address Translation, (PAT). Large Enterprise ISPs can offer each customer a unique IP address for each device the customer has.
  • IPv6 does not use Layer 3 broadcast addresses, but it does employ solicited node multi-cast addresses. This is a more efficient and selective technique for processes such as address resolution. IPv4 uses Address Resolution Protocol, (ARP) broadcasts, IPv6 uses solicited node multi-casts to accomplish the same purpose.
  • A variety of tools accompany IPv6 to help with the transition from IPv4 to IPv6. This includes tunneling and NAT. Tunneling is the process of encapsulating the IPv6 packets into an IPv4 packet so that it can be delivered over IPv4 networks. NAT is the process providing a mechanism to translate an IPv4 address to an IPv6 address or vice versa.
  • PAT is known also as NAT overloading, single address NAT or port-level multiplexed NAT. By using PAT, each computer on a private network can be translated to the same public IP address, each having a different source port assigned.