  With an increase in the number of internet users and the need to secure
internet traffic, the unreliable IPv4 protocol has been replaced by a more
secure protocol, called IPv6 for Internet system. The IPv6 protocol does not
allow intermediate routers to fragment the on-going IPv6 packet. Moreover, due
to IP tunneling, some extra headers are added to the IPv6 packet, exceeding the
packet size higher than the maximum transmission unit (MTU), resulting in
increase in packet drops. One probable solution is to find the MTU of every
link in advance using the Internet Control Message Protocol (ICMP) packets and
accordingly fragment the packets at the source itself. However, most of the
intermediate routers and the network firewalls do not allow ICMP packets to
traverse through their network, resulting in network black holes, where we
cannot know the MTU of some links in advance. This method tries to handle the
packet drops in IPv6 network by proposing a DMTU scheme where we dynamically
adjust the MTU of each link depending upon the original size of the IPv6
packet, thereby reducing the number of packet drops by a significant amount.
Using mathematical and graphical analysis, our scheme proves to be much more
efficient than the state-of-the-art PMTUD scheme. In this paper the method,
mathematical and graphical representations are focusing solely in IPv6 Internet
communication.
