Understanding IP Addressing

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WHITE PAPERUnderstandingIP Addressing :Everything YouEver Wanted ToKnowUnderstanding IP Addressing : EverythingYou Ever Wanted To KnowCONTENTSInternet Scaling Problems 1Classful IP Addressing 3Subnetting 7Variable Length subnet Masks (VLSM) 18Classless Inter-Domain Routing (CIDR) 31New Solutions for Scaling the Internet Address Space 39IPv6 Resolves IPv4 Issues 42Additional IPv6 Features 49Keeping Current on Internet Addressing Issues 50Appendix A - References 52Appendix B - Classful IP Addressing 55Appendix C - subnetting Exercises 57Appendix D - VLSM Exercise 61Appendix E - CIDR Exercises 66IIIUnderstanding IP Addressing :Everything You Ever Wanted To KnowThe Internet continues to grow at a phenomenal rate. This is reflected inthe tremendous popularity of the World Wide Web (WWW), the opportu-nities that businesses see in reaching customers from virtual storefronts,and the emergence of new ways of doing business.

UNDERSTANDING IP ADDRESSING 8 Subnetting In 1985, RFC 950 defined a standard procedure to support the subnet-ting, or division, of a single Class A, B, or C network number into smaller pieces. Subnetting was introduced to overcome some of the • •

  Ting, Addressing, Subnetting, Subnet, Subnet ting