Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual do Utilizador descarregar pdf (Página 58)

Configuring SNMP, BootP, DHCP, and RARP Services

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117362-C Rev 00

Using a Router Configured as a BootP Relay Agent

The client can acquire the same IP address again using a BootP relay agent by

following these steps:

The client starts the interchange by broadcasting a DHCPREQUEST packet

that contains its previous IP address in the client IP address field.

The BootP relay agent receives the packet and forwards it to DHCP servers on

other networks.

DHCP servers examine the client’s configuration parameters in the options

field of the DHCPREQUEST packet.

The server that originally supplied the configuration parameters recognizes

them and responds with a DHCPACK packet.

When a client receives a DHCPACK packet, it accepts or declines the

parameters, as it would when receiving a new IP address.

If a client’s request is invalid (for example, when the client has moved to a new

network), servers respond with a DHCPNAK packet. If a client receives only

DHCPNAK packet, it must request a new IP address by broadcasting a

DHCPDISCOVER packet.

Using a DHCP Server

The client can acquire the same IP address again using a DHCP server by

following these steps:

The client starts the interchange by broadcasting a DHCPREQUEST packet

that contains its previous IP address in the client IP address field.

The DHCP server receives the packet, examines the client’s configuration

parameters in the options field of the DHCPREQUEST packet, and forwards

the client request information to the NetID Server Manager.

The NetID Server Manager updates its database and sends a committed

update message back to the DHCP server.

The DHCP server that originally supplied the configuration parameters

recognizes them and responds with a DHCPACK packet.

When a client receives a DHCPACK packet from the DHCP server, it accepts

or declines the parameters, as it would when receiving a new IP address.

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual do Utilizador Página 58