Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario descargar pdf (Pagina 54)

Configuring SNMP, BootP, DHCP, and RARP Services

2-24

117362-C Rev 00

Accepting or Declining IP Information

In a network configuration in which a router is configured as a BootP/DHCP relay

agent, 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. The

DHCPACK packet contains the committed IP address.

The client examines the configuration parameters in the DHCPACK packet

and records the duration of the lease period. If the client detects a problem

with the configuration parameters, it sends a DHCPDECLINE packet to the

server and issues a new DHCPDISCOVER packet. Otherwise, the client

accepts the configuration parameters.

• If the target server cannot supply the requested configuration parameters, it

sends a DHCPNAK packet to the client through the BootP relay agent.

When the client receives the DHCPNAK packet, it broadcasts a new

DHCPDISCOVER packet and the process begins again.

A client may choose to relinquish its IP address before the lease period expires by

sending a DHCPRELEASE packet to the server. This packet contains the

relinquished IP address in the client IP address field and the client’s MAC address

in the client hardware address field.

How Clients Acquire IP Addresses Using a DHCP Server

A client acquires its IP address from a DHCP server by:

• Identifying DHCP servers

• Requesting and receiving IP information

• Accepting or declining IP information

The following sections describe each of these stages in detail.

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 175 176

Sin comentarios

Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario Pagina 54