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The Internet Protocol IP

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Traditional IP Addressing (IPv4) From Source ... Network ID Host ID. Transmit datagrams from one host to another. ... (scarify of class B, plenty of class C) ... – PowerPoint PPT presentation

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Title: The Internet Protocol IP


1
The Internet Protocol (IP)
  • 20010110. Kim Jung hyun

2
Contents
0
  • Introduction to IP
  • Traditional IP Addressing (IPv4)
  • From Source to Destination on IP
  • IP Datagram Format
  • IP Datagram Fragmentation
  • ICMP
  • DHCP

3
Introduction to IP
1
  • The network protocol in the Internet
  • IP address ? Network ID Host ID
  • Transmit datagrams from one host to another. if
    necessary, via intermediate routers
  • Network Information Center(NIC)

4
Introduction to IP (contd)
1
  • Unreliable packet delivery
  • Only header check sum
  • When an IP datagram is longer than the MTU of the
    underlying network? broken into smaller packets
    at the source, and? reassembled at the final
    destination

5
Introduction to IP (contd)
1
  • Address resolution- convert IP address to
    network address of a host for a specific
    underlying network(Ex) convert 32 bits IP
    address to 48 bits Ethernet address
  • Translation is network Technology-dependent

6
IPV4 Addressing
2
  • IETF RFC 791 (1981)
  • 32 bits numeric id - 4 billion hosts(Ex
    223.1.1.219 )
  • Using Dot notation

7
IPV4 Addressing
2
  • Network has an address, using network mask, (Ex
    223.1.1.0 /24)

8
IPV4 Addressing
2
  • Internet Address Structure classful
  • ? 5 classes ( A E )

9
IPV4 Addressing
2
10
IPV4 Addressing
2
  • Classless InterDomain Routing(CIDR)
  • ? Problem of shortage of IP address (scarify
    of class B, plenty of class C)
  • ? Allocate a batch of contiguous class C address
    to a subnet requiring more than 255 addresses
  • ? Add a mask field to the routing table
  • ? IETF RFC 1519 (1993)

11
Moving a Datagram from Source to Destination
3
12
Moving a Datagram from Source to Destination
3
13
Moving a Datagram from Source to Destination
3
14
IP Datagram Format (IPv4)
4
15
IP Datagram Fragmentation
5
  • When an IP datagram is longer than the MTU of the
    underlying network? broken into smaller packets
    at the source, and? reassembled at the final
    destination

16
IP Datagram Fragmentation
5
17
ICMP Internet Control Message Protocol
6
  • RFC 792
  • Typically used for error reporting(Ex
    Destination network unreachable)
  • Has Type Code filed

18
ICMP Internet Control Message Protocol
6
19
DHCP Dynamic Host Configuration Protocol
7
  • Used to assign IP addresses to hosts dynamically
  • Client-Server protocol

20
DHCP Dynamic Host Configuration Protocol
7
  • DHCP server discovery (C to S)
  • DHCP server offer (S to C)
  • DHCP request (C to S)
  • DHCP ACK (S to C)

21
8
  • Thank you
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