From IPv4 To IPv6- The Big Switch
IP or Internet protocol address is a unique identifier that are used to identify devices that are connected to the network (Internet). IP addressing needs some sort of sub-netting and subnet mask. Currently we are using IPv4 (IP version 4) so in this version we have some classes like class A (IP), class B (IP) and class C (IP) and so on.
World IPv6 Day
On June 8, 2011, Google, Facebook, Yahoo and some major organisation will offer their content over IPv6 for a 24-hour. This world IPv6 day also known as "Test Drive Day" and its organised by Internet Society.
The main aim of this day is to motivate organisations to prepare their services for IPv6 as soon as possible.
IPv4:
Limitation Of IPv4
- Today the Internet is on IPv4, IPv4 was good but now due to it Internet has to face some problem, the main and the major problem is growing shortage of IPv4 addresses. There are new machines added on Internet daily and IPv4 is no longer going to support all of these machines.
- This limitation force the organisation to use NAT (Network Address Translation) a protocol to map multiple private addresses into single public address. NATs does not support standards-based network-layer security and also creates complicated barriers to VoIP, and other services.
- The routing tables on the backbone of Internet become larger.
IPv4 VS IPv6
IPv4:
- Source and destination addresses are 32 bits (4 bytes) in length, means 2^32 which amounts to around 4.3 billion addresses.
- Security (IPsec) support is optional.
- Header includes a checksum.
- Require manual configuration or DHCP
- Send traffic all the node on a subnet (broadcast).
- Sending host and router both has to fragment the packets
- Source and destination addresses are 128 bits (16 bytes) in length, means 2^128 which is 3.4*10^8 (340 undecillion) addresses.
- Security (IPsec) support is required.
- Header does not includes a checksum.
- Do not require manual or DHCP.
- Link-local scope all-nodes multicast address
- Sending host has to fragment the packets.
Test Your IPv6
Be prepare for IPv6 because IPv6 is coming, now check your computer and ISP for IPv6.
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