Introduction to IPv6 Best Cisco CCSP Training Institute in New Delhi

Network Bulls
www.networkbulls.com
Best Institute for CCNA CCNP CCSP CCIP CCIE Training in India
M-44, Old Dlf, Sector-14 Gurgaon, Haryana, India
Call: +91-9654672192

You should become familiar at a high level with IPv6 specifications, addressing, and design. The driving motivation for the adoption of a new version of IP is the limitation imposed by the 32-bit address field in IPv4. In the 1990s, there was concern that the IP address space would be depleted soon. Although classless interdomain routing (CIDR) and NAT have slowed down the deployment of IPv6, its standards and deployments are becoming mature. IPv6 is playing a significant role in the deployment of IP services for wireless phones. Some countries such as Japan directed IPv6 compatibility back in 2005. Several IPv6 test beds include the 6bone and the 6ren. The 6bone was an IPv6 test bed that focused on testing standards, implementations, and transition and operational procedures. The 6bone has served its purpose and ceased to operate in 2006. The 6ren is an IPv6 network that serves research and educational institutions. Furthermore, the U.S. Federal government has mandated all agencies to support IPv6 by mid 2008.

The IPv6 specification provides 128 bits for addressing, a significant increase from 32 bits. The overall specification of IPv6 is in RFC 2460. Other RFCs describing IPv6 specifications are 3513, 3587, 3879, 2373, 2374, 2461, 1886, and 1981.

IPv6 includes the following enhancements over IPv4:

• Expanded address space— IPv6 uses 128-bit addresses instead of the 32-bit addresses in IPv4.
• Globally unique IP addresses— The additional address spaces allow each node to have a unique address and eliminate the need for NAT.
• Fixed header length— The IPv6 header length is fixed, allowing vendors to improve switching efficiency.
• Improved option mechanism— IPv6 options are placed in separate optional headers that are located between the IPv6 header and the transport layer header. The option headers are not required.
• Address autoconfiguration— This capability provides for dynamic assignment of IPv6 addresses. IPv6 hosts can automatically configure themselves, with or without a Dynamic Host Configuration Protocol (DHCP) server.
• Support for labeling traffic flows— Instead of the type-of-service field in IPv4, IPv6 enables the labeling of packets belonging to a particular traffic class for which the sender requests special handling. This support aids specialized traffic, such as real-time video.
• Security capabilities— IPv6 includes features that support authentication and privacy.
• Maximum transmission unit (MTU) path discovery— IPv6 eliminates the need to fragment packets by implementing MTU path discovery before sending packets to a destination.
• Site multihoming— IPv6 allows multihoming of hosts and networks to have multiple IPv6 prefixes, which facilitates connection to multiple ISPs.