Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál stáhnout pdf (Strana 46)

Configuring SNMP, BootP, DHCP, and RARP Services

2-16

303542-A Rev 00

Identifying DHCP Servers

Figure 2-5

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

Figure 2-5. Identifying DHCP Servers

To identify DHCP servers, the client broadcasts a DHCPDISCOVER packet.

Figure 2-6 shows the fields in a DHCP packet. The packet relay process uses these

fields as follows:

1. A BootP relay agent receives the packet and, if it accepts the packet, transmits

it to DHCP servers on other networks.

3. Servers transmit

DHCPOFFER

packets to BOOTP

relay agent.

1. Client broadcasts

a DHCPDISCOVER

packet.

4. BOOTP relay

agent transmits

DHCPOFFER

packets to client.

2. BOOTP relay agent

transmits the

DHCPDISCOVER

packet to servers

on other networks.

Router (BOOTP

relay agent)

Client

Server

SNM0005A

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál Strana 46