Avaya Configuring BOOTP Services Bedienungsanleitung PDF herunterladen (Seite 57)

SNMP, BootP, BootP/DHCP Relay, and DHCP Server Concepts

308644-15.1 Rev 00

2-25

The router configured as a DHCP server receives the packet and finds an

available IP address to assign to the client.

The DHCP server sends an ICMP echo request to the prospective IP address

to determine whether the address is available. If the DHCP server receives a

response, the address is unavailable because it is being used by another host

on the network. The DHCP server selects another IP address to offer and

sends another ICMP echo request.

If there is no response to the ICMP echo request, the DHCP server sends a

DHCPOFFER packet that includes an available IP address to the target DHCP

client.

If a client does not receive a DHCPOFFER packet within a specified amount

of time after broadcasting a DHCPDISCOVER packet, it sends the packet

again. The client may rebroadcast the packet a number of times. However,

clients operating on systems running Windows 95 broadcast four

DHCPDISCOVER packets, each 2 seconds apart.

The client may receive DHCPOFFER packets from several potential servers.

If you configure the client to wait for multiple responses, it compares

configuration parameters in the DHCPOFFER packets to decide which server

to target.

Requesting and Receiving IP Information

Figure 2-10

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

from a DHCP server.

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Avaya Configuring BOOTP Services Bedienungsanleitung Seite 57