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K-169
User Guide for Cisco Security Manager 3.2
OL-16066-01
Appendix K Router Platform User Interface Reference
DHCP Policy Page
Option 66 The IP address of the TFTP server required by IP phones for configuration,
as defined using DHCP option 66.
Add button Opens the IP Pool Dialog Box, page K-171. From here you can define a
DHCP IP address pool.
Edit button Opens the IP Pool Dialog Box, page K-171. From here you can edit the
selected IP pool.
Delete button Deletes the selected IP pools.
Relay parameters
Policy The policy that DHCP relay agents implement when they receive messages
already containing relay information:
• Drop—The relay agent discards messages with existing relay
information if option-82 information is also present.
• Keep—The relay agent retains existing relay information.
• Replace—The relay agent overwrites existing information with its own
relay information.
Option When selected, enables DHCP Option 82 data insertion in message requests
forwarded from the DHCP client to the server. DHCP Option 82 provides the
DHCP server with both the switch and port ID of the requesting client. This
option makes it possible to locate where a user is physically connected to the
network and prevent spoofing. See Understanding DHCP Option 82,
page 15-119.
When deselected, DHCP Option 82 is disabled.
Check When selected, DHCP Option 82 reply packets received from the DHCP
server are validated. Invalid messages are dropped; valid messages are
stripped of the option-82 field before being forwarded to the DHCP client.
When deselected, the option-82 field is removed from the packet without
being checked first for validity.
Save button Saves your changes to the Security Manager server but keeps them private.
Note To publish your changes, click the Submit button on the toolbar.
Table K-74 DHCP Policy Page (Continued)