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way to a packet's destination. This function is very similar in function to IPv4's Loose Source and Record Route option.

IPv6 Quality-of-Service Capabilities
The Flow Label and the Priority fields in the IPv6 header may be used by a host to identify those packets for which it requests special handling by IPv6 routers, such as non-default quality of service or "real-time" service. This capability is important in order to support applications which require some degree of consistent throughput, delay, and/or jitter. These types of applications are commonly described as "multi- media" or "real-time" applications.

IPv6 Security
The current Internet has a number of security problems and lacks effective privacy and authentication mechanisms below the application layer. IPv6 remedies these shortcomings by having two integrated options that provide security services. Transport mode and Tunnel mode are security services that provide security such as authentication, integrity, confidentiality and access control at the IP layer. These two options may be used singly or together to provide differing levels of security to different users. This is very important because different user communities have different security needs.

IPv6 Transition Mechanisms
The key transition objective is to allow IPv6 and IPv4 hosts to interoperate. A second objective is to allow IPv6 hosts and routers to be deployed in the Internet in a highly diffuse and incremental fashion, with few interdependencies. A third objective is that the transition should be as easy as possible for end- users, system administrators, and network operators to understand and carry out.

The IPv6 transition mechanisms are a set of protocol mechanisms implemented in hosts and routers, along with some operational guidelines for addressing and deployment, designed to make transition the Internet to IPv6 work with as little disruption as possible.

The IPv6 transition mechanism provides a number of features, including:
Incremental upgrade and deployment. Individual IPv4 hosts and routers may be upgraded to IPv6 one at a time without requiring any other hosts or routers to be upgraded at the same time. New IPv6 hosts and routers can be installed one by one.

The only prerequisite to upgrading hosts to IPv6 is that the DNS server must first be upgraded to handle IPv6 address records. There are no pre-requisites to upgrading routers.

When existing installed IPv4 hosts or routers are upgraded to IPv6, they may continue to use their

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