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IPv6 introduces a number of changes to the format of headers contained in a standard IPv4 packet. The following fields are common to IPv4 and IPv6: Version Length Service Type Packet Length Identification Fragment Offset TTL Transport Header Checksum Source Address Destination Address Options Padding However, there are several brand new headers that contain important information in standard format: Version Number A 6 identifies IPv6
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Priority Sets a priority value depending on whether a packet is non congestion (priority) controlled or congestion-controlled Flow Label Next Header Sets a QualityOfService parameter for the packet Size of the packet s data Determines whether an Extension Header follows Payload Length
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Hop Limit Sets a limit on the number of nodes that can handle the packet (graceful degradation)
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A number of extensions to the standard headers are available in the Extended Header if flagged in the Next Header field of the standard header. The following extensions are currently being developed: Authentication and security Confidentiality Destination data Extended routing Hop-by-hop processing Reassembly
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Quality of service (QoS) is very much a missing component of IPv4. When IPv4 was developed, there was no such thing as mission critical e-commerce data being exchanged between organizations on the Internet. However, with the rise of B2B e-commerce and the development of digital virtual enterprises, ensuring QoS is critical to the operation of certain classes of applications and services (such as Web Services). IPv6 provides QoS through a priority and flow label system of packet prioritization defined within the packet header. There are several different priority values that have been suggested for congestion-controlled traffic, which has a lower priority than noncongestion-controlled traffic: 0 1 2 3 4 5 6 7 Unclassified Bulk traffic Noninteractive bulk data transfer Undefined Interactive bulk data transfer Undefined Interactive non-bulk data transfer Control traffic
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All IPv6 stacks must implement IPSec. IPSec provides security at the Internet layer rather than at the Transport layer (like the Secure Sockets Layer currently provides for secure e-commerce). IPSec provides facilities for encryption, authentication, implementation of security policies, and data compression. The two main components of IPv6 security are packet encryption through the Encapsulated Security Payload (ESP) and source authentication through the Authentication Header (AH).
25:
Internet Layer (IPv6)
The ESP provides confidentiality, authentication, and integrity checks, while the AH only supports authentication and integrity, and works at the packet level it uses strong cryptography to ensure that a packet can be authentically exchanged between two interfaces by sharing a secret key. This allows the two parties to be assured that the packet has not been tampered with in transit, and that the packet originated from the source interface as described in the packet s header. The ESP provides a different level of security than the AH, by ensuring that the data contained within a packet has not been intercepted and decrypted by a third party, as long as the secret key protecting the data has not been given to a third party. Key management is clearly a central issue in the provision of a secure platform for IPv6. That s why the Internet key exchange (IKE) system is important to the success of IPSec. IKE makes it possible for two systems to share secret keys in a secure environment. However, if a cracker discovers a secret key, then all of the traffic previously protected by the key will be open for reading by that hacker. This is why secret keys cannot be used indefinitely, and should be regularly modified. One of the benefits of using Solaris IPSec is that it incorporates IKE Solaris 8 IPSec did not support IKE, since it was not part of the IPSec standard at the time, leading to cross-platform incompatibilities.
Summary
This chapter examined the future of the Internet Protocol as embodied by IPv6, which is the next-generation IP. The areas in which IPv6 introduces the greatest changes are security, addressing, routing, and quality of service. Much of the detail in IPv6 differs from IPv4, and these changes were covered in detail in this chapter.
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