Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manuel d'utilisateur télécharger pdf (Page 48)

Configuring SNMP, BootP, DHCP, and RARP Services

2-18

303542-A Rev 00

Requesting and Receiving IP Information

Figure 2-7

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

Figure 2-7. Requesting and Receiving IP Information

When the client has chosen a target server, it broadcasts a DHCPREQUEST

packet. The DHCPREQUEST packet contains the address of the target server

in the server IP address field.

2. The router receives the packet and forwards it to all servers.

3. Those servers examine the packet, and if their IP addresses differ from the

value in the server IP address field, they reclaim the IP addresses they

supplied in the DHCPOFFER packets. These addresses are now available for

other clients.

Accepting or Declining IP Information

The target server recognizes its IP address in the server IP address field, and

responds to the DHCPREQUEST packet as follows:

• If the target server can supply the requested configuration parameters, it sends

a DHCPACK packet to the client through the BootP relay agent.

3. Target server transmits

DHCPACK or DHCPNAK

packet to BOOTP

relay

agent.

1. Client broadcasts

a DHCPREQUEST

packet.

4. BOOTP relay agent

transmits DHCPACK

or DHCPNAK

packet to client.

2. BOOTP relay agent

transmits DHCPREQUEST

packet to all servers

that supplied a

DHCPOFFER packet.

Router (BOOTP

relay agent)

Client

Server

SNM0006A

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manuel d'utilisateur Page 48