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FRAGMENTATION AND REASSEMBLY Datagrams can vary in size As a result of this size variation, it is possible that the datagram can get stuck in an intermediate network while in transit to its destination Routers are preset to accept datagrams of a specific size However, in order to ensure that the information is not lost, the router in the intermediate network will chop the datagram into smaller pieces The destination router takes the responsibility of reassembling all of the pieces This capability ensures that no matter what operational parameter may have been established by another network manager, the datagram still continues its journey It is unfortunate that the fragmentation and reassembly capability drastically increases the amount of time it takes for the ultimate destination to obtain the full datagram ADAPTIVE/DYNAMIC ROUTING Adaptive/dynamic routing refers to the IP ability to determine the best path of transmission in real time In other words, as the datagrams are traversing the network in a multitude of paths, every network router is making a decision (in real time) as to the next best intermediate destination of the datagram This means that any physical change in one of the many intermediate networks would not affect the datagram In other words, a change in any one of the networks would cause the datagram to take a different route The capability of real time adapt routes is a fantastic capability that serves to increase the flexibility and usefulness of IP Figure 59 is an illustration of the IPv4 datagram
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Length of Datagram Fragment Offset
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Source IP Address Destination IP Address
OPTIONS
DATA
FIGURE 5-9
IPv4 datagram
IPV4 SUMMARY A number of weaknesses and issues exist concerning IPv4 s ability to support time sensitive applications like voice However, these limitations do not diminish the power of the protocol in any way If IPv4 was not as flexible in its ability to support the interconnection of multiple vendors devices and in its ability to adaptively route, the Internet would not exist The next section will take a brief look at Internet Protocol Version 6 (IPv6) INTERNET PROTOCOL (IP) VERSION 6 Many industry pundits are claiming to find salvation with the arrival of IPv6 However, one should note that in the world of telecommunications (of which I claim the Internet is a part), nothing is static IPv6 is still under development by the Internet
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Engineering Task Force (IETF) and various industry consortiums So much hope has been placed in IPv6 that many call it IP Next Generation IPv6 brings a number of innovations to the Internet:
The current 32-bit (8-byte) address has been expanded to 128 bits (16 byte) The expanded format now enables hierarchical addressing, which is helpful in routing schemas requiring more structured and faster routing The IPv6 format also supports private Internet site addresses for use within a company This is similar to a telephone company s allowance for PBX dialing extensions The expanded format also enables the use of multicast addressing where multiple people and locations receive information simultaneously Self-configuration of addresses Enhances the protocol s ability to detect the next-hop routers and determine whether or not the routers are active, which can reduce latencies arising from transit times Enhances the protocol s ability to detect a healthy and usable transmission path The addresses can now be structured to simplify address delegation and routing The addressing methods used in IPv6 are similar to bulk addressing of signaling points in a SS7 network, where the nodes can be addressed as either a cluster of nodes or as individual nodes This addressing methodology simplifies routing plans Supports a new flow label that effectively introduces the concept of information flows, which can be used to support voice and maybe even video Packets can now be tagged with just the origin and destination so the packet does not need to have its entire header read, just the tag Authentication Data integrity
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