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15NetBotz Rack Monitor 200 Installation and Quick Configuration Manual
DHCP Server
The DHCP server must be set up with an encapsulated APC cookie in the Vendor Specific Information
option (DHCP option 43); otherwise, DHCP offers will be ignored by the Rack Monitor 200. If you do
not want to use option 43, disable the cookie requirement (see “How to disable the cookie requirement”
on this page).
For complete details on Rack Monitor 200 communication with a DHCP server, see “TCP/IP
and Communication Settings” in the NetBotz Rack Monitor 200 User’s Guide. For details on
how to access the user’s guide, see “Additional Documentation” on page 1.
How to set up option 43
The Main Module (NetBotz Rack Monitor 200) requires option 43 in a DHCP response to determine
whether the DHCP response is valid. This option contains up to two APC-specific options in a TAG/
LEN/DATA format: the APC Cookie and the Boot Mode Transition.
• APC Cookie. Tag 1, Len 4, Data “1APC”
Option 43 communicates to the Main Module that a DHCP server is configured to service
APC devices. By default, the DHCP response must contain the APC Cookie for the Main
Module to accept the lease.
Following, in hexadecimal format, is an example of a Vendor Specific Information option that
contains the APC cookie:
Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43
• Boot Mode Transition. Tag 2, Len 1, Data 1/2
Boot Mode Transition enables or disables the Main Module option Remain in DHCP &
BOOTP mode after accepting TCP/IP settings, which is disabled by default.
– A data value of 1 enables the option Remain in DHCP & BOOTP mode after accepting
TCP/IP settings. When the Main Module reboots, it will request its network assignment first
from a BOOTP server and then, if necessary, from a DHCP server.
– A data value of 2 disables the option Remain in DHCP & BOOTP mode after accepting
TCP/IP settings. The TCP/IP Configuration setting switches to DHCP when the Main
Module accepts this DHCP response. Thereafter, whenever the Main Module reboots, it will
request its network assignment from a DHCP server only.
Following, in hexadecimal format, is an example of the Vendor Specific Information option
that contains the APC cookie and the data value to disable the Remain in DHCP & BOOTP
mode after accepting TCP/IP settings:
Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43 0x02 0x01 0x01
How to disable the cookie requirement
1. Access the control console through the serial port on the Rack Monitor 200. (See “How to access
the control console” on page 19.)
2. Follow the menu path Network > TCP/IP > Boot Mode > DHCP only > Advanced > DHCP
Cookie Is > Not required to accept offer.
3. Enter Accept Changes.