Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Manual do Utilizador Página 69

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SNMP, RMON, BootP, DHCP, and RARP Concepts
117362-A Rev. A 2-33
To identify DHCP servers, the client broadcasts a DHCPDISCOVER packet.
F
igure 2-8 shows the fields in a DHCP packet. The packet relay process uses these
elds as follows:
1. A BootP relay agent receives the packet and, if it accepts the packet, transmits
it to DHCP servers on other networks.
Figure 2-8. Fields in a DHCP Packet
2. DHCP servers may respond with a DHCPOFFER packet that includes an
available IP address in the your IP address field.
When a DHCP server offers an IP address, that address is temporarily
unavailable to other clients. If the client does not accept or reject the address
within a certain period of time, the server reclaims it. The address is then
available for other clients.
3. The BootP relay agent receives the DHCPOFFER packet and examines the
packet. If the BootP relay agent accepts the packet, it forwards it to the client.
4. 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 will rebroadcast the packet up to 10 times.
Transaction ID (4)
Seconds (2)
Flags (2)
Client IP address (4)
Your IP address (4)
Server IP address (4)
Gateway IP address (16)
Client hardware address (16)
Server name (64)
File name (128)
Options (312)
Operation (1)
*
Hardware type (1)
Hardware address
length (1) Hops (1)
*
The number in parentheses indicates the number of octets in each field.
SNM0004A
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