User guide

Chapter 4. Configuring Special Features 87
Commands for Specific Option Values for a Client Lease
To set the value for an option associated with a specific client, use:
dhcp set valueoption <ipaddr> <code> <value>...
To clear the value for an option associated with a specific client, use:
dhcp clear valueoption <ipaddr> <code>
Example:
dhcp set valueoption 192.168.254.251 winserver 192.168.254.7
Commands for Listing and Checking Option Values
To list the values for global options as well as subnet and client lease information, use:
dhcp list
To list options that are set for that subnet/client lease as well as subnet/client lease information, use:
dhcp list <net>|<ipaddr>
This command lists all available options (predefined and user-defined options):
dhcp list definedoptions
This command lists all available options starting with the string ÒnameÓ.
dhcp list definedoptions name
To list the lease time use:
dhcp list lease
Example:
This command lists the subnet 192.168.254.0 including any options set specifically for that subnet:
dhcp list 192.168.254.0
Managing BootP
Administrators can enable and disable BootP and specify the BootP server. BootP can be enabled at the
subnetwork and at the client lease level.
Note: By default, the DHCP server does not satisfy BootP requests unless the administrator has explicitly enabled
BootP (at the subnetwork or lease level).
About BootP and DHCP
BootP and DHCP provide services that are very similar. However, as an older service, BootP offers only a
subset of the services provided by DHCP.
The main difference between BootP and DHCP is that the client lease expiration for a BootP client is always
infinite.
Note: Remember, when BootP is enabled, the client assumes that the lease is infinite.