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IPv4 to IPv6 Migration strategies. What is IPv4. 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)
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What is IPv4 • 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
What is IPv6 • 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.
Introduction • 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
Problems of IPv4 • 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
What’s good about IPv6? • 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)
IPv6 Deployment • 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.
continued • Allocation of IPv6 is same as of IPv4. • Actual conditions are growing fast but still low and unbalanced
Migration to IPv6 • 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
