10-NL-IPv4 - DatagramNe tworks: I nte t Protocol (I Pv4)...

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1 Datagram Networks: Internet Protocol (IPv4)
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2 The Internet Network layer: IP Internet Network Layer Components: IP protocol (addressing, datagram format and handling), Routing Protocols and ICMP protocol forwarding table Routing protocols path selection RIP, OSPF, BGP IP protocol addressing conventions datagram format packet handling conventions ICMP protocol error reporting router “signaling” Transport layer: TCP, UDP Link layer physical layer Network layer
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3 IP Addressing: Introduction IP address: 32-bit identifier for host, router interface interface: connection between host/router and physical link router’s typically have multiple interfaces host may have multiple interfaces IP addresses associated with each interface 223.1.1 .1 223.1.1 .2 223.1.1 .3 223.1.1 .4 223.1.2 .9 223.1.2 .2 223.1.2 .1 223.1.3 .2 223.1.3 .1 223.1.3 .27 223.1.1.1 = 11011111 00000001 00000001 00000001 223 1 1 1
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4 IP Addressing IP address: network part (high order bits) host part (low order bits) NetworkID.HostID What’s an IP network ? device interfaces with same network part of IP address Hosts within the same IP network can reach each other without intervening router network consisting of 3 IP networks: 223.1.1.0, 223.1.2.0, 223.1.3.0 223.1.1 .1 223.1.1 .2 223.1.1 .3 223.1.1 .4 223.1.2 .9 223.1.2 .2 223.1.2 .1 223.1.3 .2 223.1.3 .1 223.1.3 .27
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5 IP Addressing IP networks are not restricted to Ethernet segments Here we have 3 point-to-point links and each have a different IP network defined over them. 223.1.1 .1 223.1.1 .3 223.1.1 .4 223.1.2 .2 223.1.2 .1 223.1.2 .6 223.1.3 .2 223.1.3 .1 223.1.3. 27 223.1.1 .2 223.1.7 .0 223.1.7 .1 223.1.8 .0 223.1.8 .1 223.1.9 .1 223.1.9 .2 Interconnected system consisting of 6 IP networks
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6 IP Addressing How to find IP networks? 1. Detach each interface from router, host 2. Create “islands of isolated IP networks 3. Each island defines an IP network 4. Internet consists of millions of such IP networks 223.1.1 .1 223.1.1 .3 223.1.1 .4 223.1.2 .2 223.1.2 .1 223.1.2 .6 223.1.3 .2 223.1.3 .1 223.1.3. 27 223.1.1 .2 223.1.7 .0 223.1.7 .1 223.1.8 .0 223.1.8 .1 223.1.9 .1 223.1.9 .2 Interconnected system consisting of 6 IP networks
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7 IP Addresses 0 network host 10 network host 110 network host 1110 multicast address A B C D class 1.0.0.0 to 127.255.255.255 128.0.0.0 to 191.255.255.255 192.0.0.0 to 223.255.255.255 224.0.0.0 to 239.255.255.255 32 bits given notion of “IP network”, let’s re-examine IP addresses: We have “class-full” addressing Original Internet design
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8 IP addressing: CIDR Classful addressing: inefficient use of address space, address space exhaustion e.g., class B net allocated enough addresses for 65K hosts, even if only 2K hosts in that network No longer used in the current Internet Solution? Classless Inter Domain Routing (CIDR) CIDR: C lassless I nter D omain R outing Standardized in 1993
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This note was uploaded on 11/03/2009 for the course NET NET taught by Professor N/a during the Spring '09 term at Anadolu University.

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10-NL-IPv4 - DatagramNe tworks: I nte t Protocol (I Pv4)...

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