Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario descargar pdf (Pagina 51)

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

117362-C Rev 00

2-21

Table 2-4. Fields in a DHCP Packet

Field Octets Description

Operation 1 Message operation code or message type.

• 1= BOOTREQUEST

• 2= BOOTREPLY

Hardware type 1 Hardware address type.

For example, 1= 10mb Ethernet

Hardware address length 1 Hardware address length. For example, “6” for

10mb Ethernet

Hops 1 DHCP client sets to zero.

Transaction ID 4 A random number chosen by the client. The DHCP

client and the DHCP server use this number to

associate messages and responses exchanged

between them.

Seconds 2 The number of seconds that elapsed since a client

started trying to boot. The client fills in this number.

Flags 2 If the flags field contains the value 1, the client

does not know its own IP address. The router

broadcasts the DHCPREPLY packets to the IP

broadcast address (255.255.255.255).

If the flags field contains the value 0, the client

knows its own IP address, which appears in the

client IP address field of the DHCPREPLY packet.

The router sends the DHCPREPLY packet to that

IP address and the link-layer address that appears

in the client hardware address field.

Client IP address 4 The DHCP client IP address. This field is filled in

only if the DHCP client is in BOUND, RENEW, or

REBINDING state and can respond to ARP

requests.

Your IP address 4 “Your” (DHCP client) IP address.

Gateway IP address 16 IP address of the DHCP server to use in the next

step of the client’s bootstrap process. The DHCP

server returns this address when it sends

DHCPOFFER and DHCPACK messages to the

client.

Client hardware address 16 The hardware address of the client.

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario Pagina 51