Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manuale Utente Scaricare il pdf (Pagina 44)

Configuring SNMP, BootP, DHCP, and RARP Services

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117362-C Rev 00

• If the flags field contains the value 0, the client knows its own IP address,

which appears in the client IP address field of the BOOTREPLY packet.

The router sends the BOOTREPLY packet to that IP address and the

link-layer address that appears in the client hardware address field.

DHCP Overview

DHCP, described in RFC 1541, is an extension of BootP and is built on the

client-server mode. DHCP allows designated DHCP servers to automatically

assign IP addresses and host names to dynamically configured DHCP clients for a

pre-defined period of time.

The DHCP packet format is based on a BootP packet. As a result, DHCP uses the

BootP relay agent to forward DHCP packets. This scheme provides

interoperability between the existing BootP clients and DHCP servers. The BootP

relay agent uses the same criteria and methods for forwarding both DHCP and

BootP packets. For information about the packet relay process, see “BootP Relay

Agent Overview,” on page 2-10.

Why Use DHCP?

Each DCHP client on the network requires its own IP address and configuration

information. The DHCP client’s IP address is the identifier that other networked

devices use to recognize the client on the network. The client’s configuration

information includes the network domain name, the address of the network

servers and gateways, and the subnet mask.

Without DHCP, each time you add a client to its network, you must manually

assign an IP address and configuration information to the client. When clients

change offices or users, or leave the network altogether, the configuration

information changes as well.

DHCP facilitates network management by automating and centralizing IP address

administration and by providing IP configuration information automatically to

each networked device when it is needed.

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manuale Utente Pagina 44