Abstract
With an increase in the number of internet users and the need to secure internet traffic, the IPv4 protocol has been replaced by a more secure protocol, namely IPv6. The IPv6 protocol does not allow intermediate routers to fragment the on-going packets. Moreover, due to IP tunneling, some extra headers are added to the IPv6 packet, exceeding the packet size, resulting in increased packet drops due to lower path mtu. One probable solution is to use Path MTU Discovery (PMTUD) to know the path mtu using ICMP packets. Due to dependency on ICMP error messages, this method faces security and failure issues. In this paper, we propose a Dynamic MTU (DMTU) scheme, which tries to handle the packet drops in IPv6 network, by dynamically adjusting the MTU of each link depending upon the incoming packet size, thereby reducing the number of packet drops by a significant amount. Unlike PMTUD, the algorithm works on intermediate node level which is further optimised by assigning specific phases for validation and then, for processing. The method has ability to work in standalone and in parallel with PMTUD. Using mathematical and graphical analysis, our scheme proves to be much more efficient than the state-of-the-art PMTUD scheme.
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