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L34 - IPV6 Header Extension Headers(options Show Fig 5-69...

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IPV6 Header
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Extension Headers (options) Show Fig. 5-69 Extension headers appear in above order, if present.
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Hop-by-hop header - requires examination by every router on path. Example of hop-by-hop header for payloads > 65,535 bytes, called "jumbo" packet, up to > 4 billion bytes, no fragmenting. Useful for video packets. Show Figure 5-70. Next header, 8 bits “0" field identifies a minimum extension length of 8 bytes.
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Router extension header - Lists one or more intermediate nodes to be visited enroute to destination. Show Figure 5-71. Segments left decrements when specified routers have been visited. Header extension length, 8 bits - in 64 -bit units
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IPV4/IPV6 compatibility - zero-extending, prefixing, tunneling IPV6 through IPV4 parts. Other IPV6 features and improvements. No need for address translation. Extension header allows Source-directed routing. Anycast address to go to the nearest of a set of places.
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Return to the Transport Layer Show Figure 6.1
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The transport layer is mostly connection-
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