1 May, 2007: American Registry for Internet Numbers (ARIN) “advises the Internet community that migration to IPv6 numbering resources is necessary for any applications which require ongoing availability of contiguous IP numbering resources” US Government has mandated that all agencies support IPv6 in their backbone networks by June, 2008. Microsoft Windows 7 defaults to IPv6 Recent Developments in IPv6 Chapter 31 - A Next Generation IP (IPv6)
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May, 2007: American Registry for Internet Numbers (ARIN)
Recent Developments in IPv6. May, 2007: American Registry for Internet Numbers (ARIN) “advises the Internet community that migration to IPv6 numbering resources is necessary for any applications which require ongoing availability of contiguous IP numbering resources”. - PowerPoint PPT Presentation
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May, 2007: American Registry for Internet Numbers (ARIN)
“advises the Internet community that migration to IPv6 numbering resources is necessary for any applications which require ongoing availability of contiguous IP numbering resources”
US Government has mandated that all agencies support IPv6 in their backbone networks by June, 2008.
Microsoft Windows 7 defaults to IPv6
Recent Developments in IPv6
Chapter 31 - A Next Generation IP (IPv6)
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31.6 Features of IPv6
● Larger Addresses
● Extended Address Hierarchy
● Flexible Header Format
Not backward compatible with IPv4! Dual stacks
● Improved Options
● Provision for Protocol Extension
● Support for Autoconfiguration and Renumbering
● Support for Resource Allocation
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Recall IPv4 Datagram Format
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31.7 General Form of an IPv6 Datagram
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31.8 IPv6 Base Header Format
Changes from IPv4
● Alignment has been changed from 32-bit to 64-bit
● Header Length field has been replaced by Payload Length (base header fixed length of 40 bytes)
●Address fields now 16 octets 128-bit
● Fragmentation information moved out of fixed header into extension
● TIME-TO-LIVE replaced by HOP LIMIT
● SERVICE TYPE field renamed TRAFFIC CLASS and extended with a FLOW LABEL field
● PROTOCOL field replaced by NEXT HEADER field
● No HEADER CHECKSUM field
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31.9 IPv6 Extension Headers
With 32 octets needed for source and destination addresses, IPv6 datagram header is already much larger than IPv4 (20 bytes).
Hold header down to 40 bytes by moving all data not needed in all cases into extension headers