IPv4 to IPv6 Migration strategies

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Second revision in development of internet protocol
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First version to be widely implied.
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Connection less protocol used for packetswitched link layer networks (e.g. Ethernet)
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Uses 32 bit addresses which are equivalent to
4,294,967,296 possible unique addresses

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Version designed to succeed IPv4.
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First publicly used IP since 1981.
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Protocol for packet-switched internetworking.
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IPv6 was developed by the Internet Engineering
Task Force (IETF).
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Uses 128 bit addresses , much bigger than IPv4.

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Global shortage of IP addresses
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IP addresses have greater demands
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Despite NAT (network address translation) IPv4 addresses are likely to run out in next few years
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Need a fair policy for allocation of remaining IP addresses.
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Deployment of IPv6 needed on urgent basis

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Fixed length, 32 bit scheme
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Managed by IANA
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Low government involvement
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Need for international cooperation
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Policy for addresses was for first come, first serve.
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Pre occupation of large amount of addresses by early users

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Bigger address space
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No need of NAT
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Full IP connectivity
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Facilitates mobile devices
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Allows roaming between different networks
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Built in security system
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Unicast ,multicast, anycast (types of addresses)

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Mobile/wireless connections are growing at very fast rate.
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Will provide larger availability of mobile networks
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It is good for mobile networks for its low cost,
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Higher speed of deployment
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For wireless, larger IP address is required.

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Allocation of IPv6 is same as of IPv4.
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Actual conditions are growing fast but still low and unbalanced

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Dual stack (IPv4 and IPv6 running at same time)
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End nodes and routers run both at a time
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Tunneling
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Carry one protocol inside another
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IPv6 encapsulated in IPv4 and sent to portions of network
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Protocol translation will translate IPv6 packets into IPv4 packets