Avaya Configuring BOOTP Services User Manual Page 51
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SNMP, BootP, BootP/DHCP Relay, and DHCP Server Concepts
308644-15.1 Rev 00
2-19
To locate DHCP servers on the network, the DHCP client broadcasts a
DHCPDISCOVER packet. Table 2-4
describes the fields in a DHCP packet.
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= 10 Mb Ethernet
Hardware address length 1 Hardware address length, for example:
“6” for 10 Mb Ethernet
Hops 1 DHCP client sets to 0.
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 to 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 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.
(continued)
- Configuring SNMP, BootP 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308644-15.1 Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- Hard-Copy Technical Manuals 18
- How to Get Help 19
- Chapter 1 21
- Starting Configuration Tools 22
- Starting SNMP Services 25
- Starting BootP Services 26
- Starting BootP/DHCP Relay 27
- Starting a DHCP Server 29
- Chapter 2 33
- SNMP Overview 34
- Figure 2-1. Role of SNMP 35
- SNMP Communities 36
- SNMP Implementation Notes 37
- Table 2-1. Severity Levels 38
- Thresholds 39
- Threshold Example 40
- BootP Relay Agent Overview 42
- DHCP Overview 46
- Dynamic IP Address Allocation 47
- DHCP Components 48
- DHCP Server Implementation 55
- Chapter 3 61
- Customizing SNMP 61
- Disabling and Reenabling SNMP 63
- Specifying a Lock Address 66
- Adding SNMP Communities 69
- Deleting an SNMP Community 72
- Adding a Manager 73
- Deleting a Manager 77
- View Index View Name 81
- Disabling a Trap Entity 87
- Configuring Trap Exceptions 88
- Deleting Trap Exceptions 90
- Configuring Thresholds 91
- Adding a Threshold 93
- Specifying Threshold Units 96
- Chapter 4 101
- Customizing BootP 101
- Using the BCC 102
- Enabling ARP Cache Support 103
- Using Site Manager 104
- ) and enter: 113
- Deleting BootP Globally 129
- Chapter 5 131
- Customizing BootP/DHCP Relay 131
- Defining DHCP Servers 133
- Chapter 6 137
- Customizing the DHCP Server 137
- Specifying the Debug Level 147
- Deleting DHCP Globally 151
- Appendix A 153
- Caution: 154
- SNMP Global Parameters 155
- SNMP Community Parameters 157
- SNMP Manager Parameters 158
- BootP and DHCP Parameters 168
- BootP Address Parameters 171
- DHCP Server Global Parameters 176
- Appendix B 181
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