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Understanding IPv6

Approx. read time : 4 min

In 1994, the Internet officially changed from a lab to a commercial network service. World Wide Web (WWW) & electronic mail (aka email) fueled it’s growth which is phenomenon & known globally. The IP address system was not designed to be a global numbering system. The number space was small. Not the way telephone system was spread with country & area codes. IP ranges were assigned to organizations inefficiently resulting in wastage of IP ranges.

The number space is being depleted. As the IP addresses are not assigned hierarchically, routing tables are growing rapidly. In no way the expansion of internet is going to slow down. There is a growth personal computers all over the globe, especially in developing Asian countries. This results in their connectivity into the global network. New challenges are presented by

  • Networking of mobile/personal computers, latest gadgets.
  • Over growing demand for real time audio/video which is pushing the internet technology to it’s limits.

The world of shopping carts has moved onto Internet & ecommerce hosting has been a boom. For these portals it is time to build security into the network infrastructure.

One more thing that haunts managers is the administration of these IP addresses due to IP address enabled devices zooms in the stratosphere. Organizations (large OR small) use IP backbones to connect the network together & tunnel the traffic. Launching IP version 6 (Ipv6, also know as IP next generation) is the need to solve these IP addressing, routing, administration, performance, security & congestion problems.

Overview of IPv6
Key points of IPv6.

  • It’s 128 bit(16 byte) addresses which simplifies address delegation & routing. They can be structured hierarchically.
  • Simplifies main IP header but defines many optional extension headers. Enabled networking functions to be added when needed.
  • Supports authentication, database integrity & confidentiality.
  • Introduces flows which us used to support many kind of transmission requirements such as real time videos.
  • Improves router discovery and detection of dead routers OR unreachable routers on the network.
  • Automatic address self-configuration methods & built in tests for IP address uniqueness.
  • Easy to encapsulate other protocols & provides a mechanism for congestion control when carrying foreign protocols.

IPv6 makes some adjustments in comparison to IPv4 & standardizes the following terminology

  • A node is any system that implements IPv6.
  • A packet is IPv6 header plus payload.
  • A host is any node that is not a router.
  • A router is a node that forwards IPv6 packets not designed to address itself.
  • Neighbors are nodes attached to same link.
  • A link is a medium over which nodes can communicate at link layer.

Packet is one word that is widely used for every layer in networking world which isn’t true.

IPv6 types

There are 3 types of addresses.

1. Unicast – Identifies a single interface.
2. Multicast – Identifies a set of interfaces. A datagram sent to unicast address is delivered to all interfaces that have joined the multicast group for this address.
3. Anycast – Identifies a set of interfaces. Here, a datagram sent to an anycast address is delivered to one address.

Boradcasts are not used in IPv6 making large switches LAN’s feasible.

IPv6 Notation

To write these addresses a compact notation is used. Eight hexadecimal numbers separated by colons. Each hexadecimal group is 16 bit.


Leading zeros in the hex field can be dropped. The above address can be compressed further by replacing the string of 0 with ::. 0 instead of 0000 & 5 instead of 0005


How & Why to change ?

Mobile Connectivity across the Internet is increasing day by day. There is a pressure of IP addresses all over the world. Implementing the IPv6 will be a relief to organizations using private as well as public network. There will be more devices around the globe & the need of IP addresses will keep on increasing. Every device over the network has a IP address assigned to it.

The first thing to implement is to upgrade DNS service that the DNS servers respond to the new address format which is IPv6. A new address record type AAAA will be used to map domains to IPv6.

MilesWeb IN AAAA 51DC::5:ABE2:9006:2114

The IPv6 have laid a foundation to solve the Internet space depletion problem with more efficient routing. Allows future updates & a way for other protocols to ride across the IP network. At, IPv6 is successfully implemented in private labs & is compatible with services on server (linux & windows). In coming months control panels will be compatible with IPv6 in their next release.

Looking for quality IPv6 Hosting? Look no further than MilesWeb Hosting!

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