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Addressing of Internet Koji OKAMURA Kyushu University.

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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 Network2

3 Addressing of Internet Protocol Information Network3 Router

4 Addressing of Internet Protocol Information Network4 123 Router 123 123 123 #1 #2 #3 #4 #5 #6 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.

5 Information Network5 Class A,B,C 01000000101010000000101000100001 10000000101010000000101000100001 11000000101010000000101000100001 Class A Class B Class C

6 Information Network6 Class A 01000000101010000000101000100001 Class A Network Address 1.0.0.0 – 127.0.0.0 Host Address 1.0.0.1 – 1.255.255.254

7 Information Network7 Class B 10000000101010000000101000100001 Class B Network Address 128.0.0.0 – 191.255.0.0 Host Address 128.0.0.1 – 128.0.255.254

8 Information Network8 Class C 11000000101010000000101000100001 Class C Network Address 192.0.0.0 – 223.255.255.0 Host Address 192.0.0.1 – 192.0.0.254

9 Information Network9 Class D(Multicast) 11100000101010000000101000100001 Class D Network Address 224.0.0.0 – 239.255.255.255

10 Information Network10 クラスレス (Classless Inter-Domain Routing:CIDR) 11000000101010000000101000100001 Class C 11000000101010000000101000100001 Classless 192.168.10.33/22

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

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

13 What’s the problem of many prefixes? Information Network13 ISP University A border BGP router must imports full routing information from all of peering ISP.

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