Product specifications
Efficient Networks
®
Router family
Technical Reference Guide
Chapter 4: System Management
Efficient Networks
®
Page 4-13
To list the definition for all options that are well-known AND have a name starting with
“h”, type:
-> dhcp list definedoptions h
Example:
To define a new option with a code of 128, a minimum number of IP addresses of 1, a
maximum number of IP addresses of 4, of type “IP address”, enter:
-> dhcp add 128 1 4 ipaddress
This information implies that:
• Some DHCP client will know about the option with code 128.
• Option 128 allows IP addresses.
• The server can have a minimum of 1 IP address.
• The server can have up to 4 IP addresses.
• The administrator will still need to set the option value either globally, specific
to a subnetwork, or specific to a client for the option to have any meaning.
To delete the definition of the option with code 128, type:
-> dhcp del 128
The values for this option that have been set globally, specific to a subnetwork, or
specific to a client will not be removed. The administrator must remove those values
explicitly. Well-known type option codes cannot be changed or deleted.
DHCP Information File
DHCP information is kept in the file DHCP.DAT, a self-contained file.
This file contains all DHCP information including:
• the option definitions
• the subnetworks that have been added
• the client lease information
• the option values that have been set
This file can be uploaded/downloaded from one router to another.