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 gro

• The need to route traffic between the ever increasing number of net-works that comprise the Internet The first problem is concerned with the eventual depletion of the IP address space. IPv4 defines a 32-bit address which means that there are only 232 (4,294,967,296) IPv4 addresses available. As the Internet con-

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