Fragmentation - Computer Network - Lecture Slides, Slides of Computer Networks

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COMPUTER

NETWORKS

Lecture-

Review Lecture 31

Success of IP

Motivation for Change

IPV6 Features

IPV6 Datagram Format

IPV6 Base Header Format

Parsing IPV6 Headers

Fragmentation

Fragmentation and Path

MTU

IPv6 source (not intermediate routers) responsible for fragmentation Routers simply drop datagrams larger than network MTU Source must fragment datagram to reach destination

Source determines path MTU Smallest MTU on any network between source and destination Fragments datagram to fit within that MTU

Use of Multiple Headers

Efficiency - header only as large as necessary

Flexibility - can add new headers for new features

Incremental development - can add processing for new features to testbed; other routers will skip those headersDocsity.com

IPv6 Addressing

128-bit addresses

Includes network prefix and host suffix

No address classes - prefix/suffix boundary can fall anywhere

IPv6 Address Notation

 128-bit addresses unwidely in dotted decimal; requires 16 numbers 105.220.136.100.255.255.255.255.0.0.18.128.140. 0.255.

 Groups of 16-bit numbers in hex separated by colons

• colon hexadecimal (or colon hex) 69DC:8864:FFFF:FFFF:0:1280:8C0A:FFFF

 Zero-compression - series of zeroes indicated by two colons FF0C:0:0:0:0:0:0:B FF0C::B

 IPv6 address with 96 leading zeros is interpreted to hold an IPv4 address Docsity.com