Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál stáhnout pdf (Strana 86)

Configuring SNMP, BOOTP, DHCP, and RARP Services

3-2

Acquiring a New IP Address and New Conﬁguration Parameters

This process involves the following stages:

• Identifying DHCP servers

• Requesting IP information

• Receiving IP information

• Accepting IP information

Figure 3-1 shows the ﬁrst stage of the process.

Figure 3-1. Identifying DHCP Servers

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

Figure 3-2 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 the packet 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)

Server

Client

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál Strana 86