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Addressing of Internet

Addressing of Internet. Koji OKAMURA Kyushu University. Quiz. An university use 192.168.0.0/22 for whole campus network and there are three departments in the university; A,B,C. Department A uses 192.168.0.0/23 Department B uses 192.168.2.0/26

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Addressing of Internet

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  1. Addressing of Internet Koji OKAMURA Kyushu University

  2. Quiz • An university use 192.168.0.0/22 for whole campus network and there are three departments in the university; A,B,C. • Department A uses 192.168.0.0/23 • Department B uses 192.168.2.0/26 • Department C has about 250 PCs. Which network address should be assigned to Department C? Information Network

  3. Addressing of Internet Protocol Router Router Router Information Network

  4. Addressing of Internet Protocol #5 #1 Router 1 2 3 1 2 3 #3 Router #2 1 2 3 #6 Router #4 1 2 3 Internet Address = Network ID (#?) + Host ID (1~3) Network IP address is IP address of which all of host ID’s bit is 0. Broadcast address is IP address of which all of host ID’s bit is 1. Information Network

  5. ClassA,B,C Class A 01000000101010000000101000100001 Class B 10000000101010000000101000100001 Class C 11000000101010000000101000100001 Information Network

  6. ClassA Class A 01000000101010000000101000100001 • Network Address • 1.0.0.0 – 127.0.0.0 • Host Address • 1.0.0.1 – 1.255.255.254 Information Network

  7. ClassB Class B 10000000101010000000101000100001 • Network Address • 128.0.0.0 – 191.255.0.0 • Host Address • 128.0.0.1 – 128.0.255.254 Information Network

  8. ClassC Class C 11000000101010000000101000100001 • Network Address • 192.0.0.0 – 223.255.255.0 • Host Address • 192.0.0.1 – 192.0.0.254 Information Network

  9. ClassD(Multicast) Class D 11100000101010000000101000100001 • Network Address • 224.0.0.0 – 239.255.255.255 Information Network

  10. クラスレス(Classless Inter-Domain Routing:CIDR) Class C 11000000101010000000101000100001 Classless 11000000101010000000101000100001 192.168.10.33/22 Information Network

  11. Address Assignment based on Class Class B 2^14 Class A 2^7 Class C 2^21

  12. CIDR:Classless Inter-Domain Routing クラスB 2^14 クラスA 2^7 クラスC 2^21 Prefix = network address + length Many Prefixes 268,500

  13. What’s the problem of many prefixes? ISP ISP University ISP ISP A border BGP router must imports full routing information from all of peering ISP. Information Network

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