Why is IPV4 still in existance

This thesis work exhibits the survival of IPv4 addressing architecture and also about the distribution and allocation of IPv4 addresses. The fast growth of the Internet demands huge address space and it is the prominent cause for IPv4 exhaustion. The information regarding the existence of IPv4 addressing architecture in spite of its huge demand for the address space is also discussed. The temporary solutions like private IP addresses, CIDR, NAT makes the life of V4 still alive. But the permanent solution is to shift towards the new addressing scheme, IPv6. The merits and demerits of using both the addressing scheme are also discussed. Deploying IPv6 leads to the co-existence of V4 and V6 during the transition phase. Hence appropriate tunneling and transition techniques have to be deployed to make communication possible across both the addressing scheme. After the transition period the whole internet will be operating with V6 address. During that phase packet travelling across LAN will be carrying huge header to payload ratio. Hence finally this paper also brings out a suggestion on reducing this ratio across the local traffic in the V6 environment