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User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 60 Router Device Administration
DHCP Policy Page
Default Router The IP addresses of the default routers used by DHCP clients.
DNS Server The IP addresses of the DNS servers used by DHCP clients.
NetBIOS (WINS) Server The IP addresses of the Windows Internet Naming Service (WINS)
servers used by Microsoft DHCP clients.
Domain Name The domain name for DHCP clients.
Import All Indicates whether the remote DHCP server imports certain DHCP
options from a centralized DHCP server.
Secured ARP Indicates whether secured ARP is enabled on this IP pool to help
prevent IP spoofing by unauthorized users.
Lease The duration of the lease for each IP address assigned by the DHCP
server from this IP pool.
Option 150 The IP address of the TFTP server required by IP phones for
configuration, as defined using DHCP option 150.
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 60-94. From here you can define a
DHCP IP address pool.
Edit button Opens the IP Pool Dialog Box, page 60-94. 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 60-89.
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.
Table 60-38 DHCP Policy Page (Continued)
Element Description