TCP/IP Protocol Suite 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 18 Host Configuration: DHCP.

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Presentation transcript:

TCP/IP Protocol Suite 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 18 Host Configuration: DHCP

TCP/IP Protocol Suite 2OBJECTIVES:  To give the reasons why we need host configuration.  To give a historical background of two protocols used for host configuration in the past.  To define DHCP as the current Dynamic Host Configuration Protocol.  To discuss DHCP operation when the client and server are on the same network or on different networks.  To show how DHCP uses two well-known ports of UDP to achieve configuration.  To discuss the states the clients go through to lease an IP address from a DHCP server.

TCP/IP Protocol Suite 3 Chapter Outline 18.1 Introduction 18.2 DHCP Operation 18.3 Configuration

TCP/IP Protocol Suite INTRODUCTION Each computer that uses the TCP/IP protocol suite needs to know its IP address. If the computer uses classless addressing or is a member of a subnet, it also needs to know its subnet mask. Most computers today need two other pieces of information: the address of a default router to be able to communicate with other networks and the address of a name server to be able to use names instead of addresses as we will see in the next chapter. In other words, four pieces of information are normally needed.

TCP/IP Protocol Suite 5 Topics Discussed in the Section Previous Protocols DHCP

TCP/IP Protocol Suite DHCP OPERATION The DHCP client and server can either be on the same network or on different networks. Let us discuss each situation separately.

TCP/IP Protocol Suite 7 Topics Discussed in the Section Same Network Different Networks UDP Ports Using TFTP Error Control Packet Format

TCP/IP Protocol Suite 8 Figure 18.1 Client and server on the same network

TCP/IP Protocol Suite 9 Figure 18.2 Client and server on two different networks

TCP/IP Protocol Suite 10 Figure 18.3 Use of UDP ports

TCP/IP Protocol Suite 11 Figure 18.4 DHCP packet format

TCP/IP Protocol Suite 12 Figure 18.5 Flag format

TCP/IP Protocol Suite 13 Figure 18.6 Option format

TCP/IP Protocol Suite 14

TCP/IP Protocol Suite CONFIGURATION The DHCP has been devised to provide static and dynamic address allocation.

TCP/IP Protocol Suite 16 Topics Discussed in the Section Static Address Allocation Dynamic Address Allocation Transition States Other Issues Exchanging Messages

TCP/IP Protocol Suite 17 Figure 18.7 Option with tag 53

TCP/IP Protocol Suite 18 Figure 18.8 DHCP client transition diagram

TCP/IP Protocol Suite 19 Figure 18.9 Exchanging messages