Avaya Configuring BOOTP Services Manual de usuario descargar pdf (Pagina 56)

Configuring SNMP, BootP, and DHCP Services

2-24

308644-15.1 Rev 00

Acquiring an IP Address

A client acquires its IP address from a router configured as a DHCP server as

follows:

Identify DHCP servers.

Request and receive IP information.

Accept or decline IP information.

The following sections describe each of these stages in detail.

Identifying DHCP Servers

Figure 2-9

shows the first stage of the process of acquiring a new IP address from

a DHCP server.

Figure 2-9. Identifying Routers Configured as DHCP Servers

To identify routers configured as DHCP servers, the DHCP client broadcasts a

DHCPDISCOVER packet on its local physical subnet. Table 2-4

on page 2-19

describes the fields in the DHCP packet. The packet release process uses these

fields as follows:

1. Client broadcasts

a DHCPDISCOVER

packet.

4. DHCP server

transmits

DHCPOFFER

packet to client.

2. DHCP server sends

ICMP echo request to

prospective IP address.

Router (DHCP server)

NetID

Server

Manager

DC0003A

The ICMP echo

request times out,

indicating that

request can be sent to client.

DHCP

client

DHCP

client

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