All government organisations should have a plan to shift to a network
that supports new version of internet addresses, IPv6, by 2017-end,
Telecom Minister Kapil Sibal on Tuesday said.
“By 2017, we should be a smart knowledge society. We will use IPv6 for
rural emergency healthcare, tele-education, smart-metering, smart-grid,
smart-building, smart-cities which has tremendous potential for
socio-economic development of this country,” Mr. Sibal said while
unveiling the roadmap.
The government has started issuing IPv6 addresses.......The Hindu
What is IPv6?
What is IPv6?
Internet has been growing extremely fast so the IPv4 addresses are
quickly approaching complete depletion. Although many organizations
already use Network Address Translators (NATs) to map multiple private
address spaces to a single public IP address but they have to face with
other problems from NAT (the use of the same private address,
security…). Moreover, many other devices than PC & laptop are
requiring an IP address to go to the Internet. To solve these problems
in long-term, a new version of the IP protocol – version 6 (IPv6) was
created and developed.
IPv6 was created by the Internet Engineering Task Force (IETF), a
standards body, as a replacement to IPv4 in 1998. So what happened with
IPv5? IP Version 5 was defined for experimental reasons and never was
deployed.
While IPv4 uses 32 bits to address the IP (provides approximately 232
= 4,294,967,296 unique addresses – but in fact about 3.7 billion
addresses are assignable because the IPv4 addressing system separates
the addresses into classes and reserves addresses for multicasting,
testing, and other specific uses), IPv6 uses up to 128 bits which
provides 2128 addresses or approximately 3.4 * 1038 addresses. Well, maybe we should say it is extremely extremely extremely huge:
IPv6 Address Types
| Address Type | Description |
| Unicast | One to One (Global, Link local, Site local) + An address destined for a single interface. |
| Multicast | One to Many + An address for a set of interfaces + Delivered to a group of interfaces identified by that address. + Replaces IPv4 “broadcast” |
| Anycast | One to Nearest (Allocated from Unicast) + Delivered to the closest interface as determined by the IGP |
A single interface may be assigned multiple IPv6 addresses of any type (unicast, anycast, multicast)
IPv6 address format
Format:
x:x:x:x:x:x:x:x – where x is a 16 bits hexadecimal field and x represents four hexadecimal digits. (http://www.9tut.com/ipv6-tutorial)
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