What you need to know about IPv6

What you need to know about IPv6

Vendors and government agencies are pushing the use of Internet Protocol Version 6 as the number of addresses available in IPv4 diminishes, and researchers find that network administrators are unprepared for the new protocol. Here's more on what you need to know about IPv6.

What is IPv6?

Internet Protocol Version 6 is a network protocol that will succeed IPv4, the protocol widely used today. (IPv5 was designed for testing, not practical use.) Both protocols help IP-networked devices talk to one another, providing security and specific addresses for devices such as printers, desktops, servers and more.

Why change?

The biggest improvement in IPv6 is a vast increase in the number of addresses that can be doled out for networked devices. Many vendors and the American Registry for Internet Numbers, which gives out the addresses in the US, suggest that only 19 per cent of the addresses for IPv4 are left, and the situation is much worse in nations outside the US. The University of New Hampshire's InterOperability Laboratory claims its members generally believe there are only enough addresses to last until 2010 or 2012, which could pinch unprepared network administrators who are planning to buy a large amount of networked gear, all needing IP addresses, at about that time.

So how big is this IPv6?

Expressed in available addresses, it's so big that only math teachers might care. It is expressed several ways numerically: IPv4, the current one, has about 232 (about 4.3 billion) addresses. In comparison, IPv6 has 2128 (or 3.4 by 1038) addresses or it can be expressed as 340,282,366,920,938,463,463,374,607,431,770,000,000. UNH's InterOperability Lab guru for IPv6, Erica Johnson, said one theory she learned during her research was that Ipv6 has so many addresses that it compares to the number of grains of sand on the Earth. That is certainly more lyrical than the mathematical expression and might actually impress somebody (and is, of course, impossible to disprove). A spokesman at UNH's test lab added that the number of addresses can be expressed as "nearly" 340 undecillion. (Oddly, undecillion is defined as 1 followed by 36 zeros in the US, but by 66 zeros in Great Britain, according to

While we are on the subject, does IPv6 have anything to do with Moonv6?

Yes! Moonv6 is a network over many sites to test the interoperability of various vendors' IPv6 hardware and software offerings. It has been in operation since 2003, using the UNH lab testbeds at the behest of a group led by the North American IPv6 Task Force and involving Department of Defense officials, the US Cyberspace Security Office and others. Some 60 vendors have tested over Moonv6.

Why Moon?

Moon is not an acronym in this case. The name Moonv6 came about because officials were trying to decide how seriously to treat the adoption of IPv6. They concluded it should have the same importance as the US determination to send a man to the moon by the end of the 1960s.

So is this a FAQ about sending another manned flight to the moon?

Not yet. But when another ambitious space flight to some outer space orb like the moon or Mars does come along, it will surely involve communications based on IPv6. The importance of the Moonv6 concept is that it helps the development and adoption of IPv6, especially in the US, where Moonv6 officials believe the interest within the US IT community has been lacklustre. Moonv6 officials attribute the lack of interest to the relatively generous supply of IPv4 addresses in the US, compared to the rest of the world, where IT managers are facing a short supply, thus leading to a general, albeit mild, panic and the adoption of IPv6.

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