WUSTL CIS 677 - IP Next Generation (IPv6) (22 pages)

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IP Next Generation (IPv6)



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IP Next Generation (IPv6)

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Pages:
22
School:
Washington University in St. Louis
Course:
Cis 677 - Introduction to Computer Networking

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IP Next Generation IPv6 Raj Jain The Ohio State University Columbus OH 43210 Jain cse ohio State Edu http www cse ohio state edu jain cis677 98 Raj Jain The Ohio State University 1 Overview Limitations of current Internet Protocol IP How many addresses do we need IPv6 Addressing IPv6 header format Raj Jain The Ohio State University 2 IP Addresses Example 164 107 134 5 1010 0100 0110 1011 1000 0110 0000 0101 A4 6B 86 05 32 bits Maximum number of address 232 4 Billion Class A Networks 15 Million nodes Class B Networks 64 000 nodes or less Class C Networks 254 nodes or less Raj Jain The Ohio State University 3 IP Address Format Three all zero network numbers are reserved 127 Class A 16 381 Class B 2 097 151 Class C networks 2 113 659 networks total Class B is most popular 20 of Class B were assigned by 7 90 and doubling every 14 months Will exhaust by 3 94 Question Estimate how big will you become Answer More than 256 Class C is too small Class B is just right Raj Jain The Ohio State University 4 How Many Addresses 10 Billion people by 2020 Each person will be served by more than one computer Assuming 100 computers per person 1012 computers More addresses may be required since Multiple interfaces per node Multiple addresses per interface Some believe 26 to 28 addresses per host Safety margin 1015 addresses IPng Requirements 1012 end systems and 109 networks Desirable 1012 to 1015 networks Raj Jain The Ohio State University 7 Address Size H Ratio log10 number of objects available bits 2n objects with n bits H Ratio log 102 0 30103 French telephone moved from 8 to 9 digits at 10 7 households H 0 26 assuming 3 3 bits digit US telephone expanded area codes with 10 8 subscribers H 0 24 SITA expanded 7 character address at 64k nodes H 0 14 assuming 5 bits char Physics space science net stopped at 15000 nodes using 16 bit addresses H 0 26 3 Million Internet hosts currently using 32 bit addresses H 0 20 A few more years to go Raj Jain The Ohio State University 8 IPv6 Addresses



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