Second revision in development of internet protocol First version to be widely implied.
Connection less protocol used for packet switched link layer networks (e.g. Ethernet) Uses 32 bit addresses which are equivalent to 4,294,967,296 possible unique addresses
Version designed to succeed IPv4.
First publicly used IP since 1981.
Protocol for packet-switched internetworking.
IPv6 was developed by the Internet Engineering Task Force (IETF).
Uses 128 bit addresses , much bigger than IPv4.
Global shortage of IP addresses IP addresses have greater demands Despite NAT (network address translation) IPv4 addresses are likely to run out in next few years Need a fair policy for allocation of remaining IP addresses.
Deployment of IPv6 needed on urgent basis
Fixed length, 32 bit scheme Managed by IANA Low government involvement Need for international cooperation Policy for addresses was for first come, first serve.
Pre occupation of large amount of addresses by early users
Bigger address space No need of NAT Full IP connectivity Facilitates mobile devices Allows roaming between different networks Built in security system Unicast ,multicast, anycast (types of addresses)
Mobile/wireless connections are growing at very fast rate.
Will provide larger availability of mobile networks It is good for mobile networks for its low cost, Higher speed of deployment For wireless, larger IP address is required.
Allocation of IPv6 is same as of IPv4.
Actual conditions are growing fast but still low and unbalanced
Dual stack (IPv4 and IPv6 running at same time) End nodes and routers run both at a time Tunneling Carry one protocol inside another IPv6 encapsulated in IPv4 and sent to portions of network Protocol translation will translate IPv6 packets into IPv4 packets