Dhcp response options, User’s guide – Dell Managed PDU LED User Manual
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USER’S GUIDE
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DHCP response options
Each valid DHCP response contains options that provide the TCP/IP settings that the
Rack PDU needs to operate on a network, and other information that affects the
operation of the Rack PDU.
Vendor Specific Information (option 43).
The Rack PDU uses this option in a DHCP
response to determine whether the DHCP response is valid. This option contains a
specific options in a TAG/LEN/DATA format the Vendor Cookie. This is disabled by
default.
•
Vendor Cookie. Tag 1, Len 4, Data “1APC”
Option 43 communicates to the Rack PDU that a DHCP server is configured to
service the Dell Rack PDUs.
Following, in hexadecimal format, is an example of a Vendor Specific Information
option that contains the vendor cookie:
Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43
TCP/IP options.
The Rack PDU uses the following options within a valid DHCP
response to define its TCP/IP settings. All of these options except the first are
described in
.
•
IP Address
(from the
yiaddr
field of the DHCP response, described in
The IP address that the DHCP server is leasing to the Rack PDU.
•
Subnet Mask
(option 1): The Subnet Mask value that the Rack PDU needs to
operate on the network.
•
Router,
i.e., Default Gateway (option 3): The default gateway address that the Rack
PDU needs to operate on the network.
•
IP Address Lease Time
(option 51): The time duration for the lease of the IP
Address to the Rack PDU.
•
Renewal Time, T1
(option 58): The time that the Rack PDU must wait after an IP
address lease is assigned before it can request a renewal of that lease.
•
Rebinding Time, T2
(option 59): The time that the Rack PDU must wait after an IP
address lease is assigned before it can seek to rebind that lease.