1 / 11

CSE4213 Computer Networks II

Learn about Variable Length Subnet Mask (VLSM) and IPv6 addressing techniques, including subnetting, fragmentation, and IPv4-compatible IPv6 addresses. Understand the format of IPv6 datagrams, extension headers, and header options.

nhartley
Download Presentation

CSE4213 Computer Networks II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CSE4213 Computer Networks II Supplementary Material (VLSM and IPv6) Course page: http://www.cs.yorku.ca/course/4213

  2. Variable Length Subnet Mask • Let’s say there is a company with a Class C network 202.145.225.0/24. • Subnet 1 requires 10 hosts • Subnet 2 requires 10 hosts • Subnet 3 requires 10 hosts • Subnet 4 requires 10 hosts • Subnet 5 requires 50 hosts • Subnet 6 requires 100 hosts • How to subnet?

  3. IPv6 Header Format

  4. IPv6 Extension Header • The general form of an IPv6 datagram. Extension headers are optional -- the minimum datagram has a base header followed by data

  5. Example • Two IPv6 datagrams in which (a) contains a base header plus data, and (b) contains a base header, route header, and data. The NEXT HEADER field in each header specifies the type of the item that follows.

  6. IPv6 Options Extension Header • Because the size of the options header can vary from one datagram to another, the HEADER LEN field specifies the exact length.

  7. IPv6 Fragmentation • In IPv4 a router performs fragmentation • In IPv6 a sending host performs fragmentation. How? • A sending host sends a packet to the size of the first link. If a router along the path cannot handle, it will drop the packet and send ICMPv6 packet too big. The sending host then resend with smaller size. • Or simply send a minimum MTU size that all routers should support – 1280 bytes

  8. IPv6 Fragmentation (2)

  9. IPv6 Addressing http://www.tcpipguide.com/free/t_IPv6AddressandAddressNotationandPrefixRepresentati.htm

  10. IPv4-Compatible IPv6 Addresses For devices that speak both IPv4 and IPv6: dual stack http://www.tcpipguide.com/free/t_IPv6IPv4AddressEmbedding.htm

  11. IPv4-Mapped IPv6 Addresses Used for mapping IPv4 devices that are not compatible with IPv6 into the IPv6 address space; it begins with 80 zeroes followed by 16 ones. (only IPv4-capable) http://www.tcpipguide.com/free/t_IPv6IPv4AddressEmbedding-2.htm

More Related