Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál stáhnout pdf (Strana 45)

SNMP, BootP, DHCP, and RARP Concepts

303542-A Rev 00

2-15

Although BootP and DHCP use the same UDP port numbers (67 and 68), they

differ in the following ways:

• DHCP defines a mechanism for clients to obtain their IP network address for a

fixed period of time (lease), allowing for reassignment of expired IP network

addresses to different clients.

• DHCP provides a mechanism for clients to acquire all of the IP configuration

parameters needed to communicate on a network.

• DHCP packet length is longer than for BootP.

The additional packet length allows a DHCP server to provide the client with

all the IP configuration parameters that it needs to operate.

• DHCP is a more complicated protocol than BootP.

DHCP has seven message types; BootP uses only two.

Acquiring a New IP Address and New Configuration Parameters

DHCP acquires an IP address and other configuration parameters for clients. This

process involves the following stages:

• Identifying DHCP servers

• Requesting and receiving IP information

• Accepting or declining IP information

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál Strana 45