Technical data

Configuring the DHCP Server
7.8 Supporting Utilities
Table 7–10 DHCP Utility Commands Associated with Databases
DHCP GUI
OpenVMS
Command
UNIX
Command Description
Active IP
Snapshot
Add/Delete
DHCPDBMOD jdbmod Modifies lease and naming
information in the database. Allows
you to preassign static IP addresses
to clients. Also allows you to create,
delete, or modify existing entries.
Preload MAC
Addresses
DHCPDBREG jdbreg Populates the database with MAC
addresses of known clients. Each
record to be loaded is terminated by
a new line, and the fields within each
record are separated by the vertical
bar (|) character.
DHCPDBDUMP jdbdump Reads and outputs information
stored in the lease database files
including MAC address information,
IP addresses, and lease information.
Each line of output describes the
lease information for one client.
Active IP
Snapshot
DHCPSHOWDBS SHOWDBS Reads the same information
described for
DHCPDBDUMP , except
that the output is in a format that is
easier to read.
DHCPDBSHOW DBSHOW Displays the contents of a single
DHCP binary database.
For information about how to enter the DHCP utility commands, see Sections
7.8.1 through 7.8.3.
7.8.1 Using the DHCPDBDUMP, DHCPSHOWDBS, and DHCPDBSHOW Utilities
The DHCPDBDUMP , DHCPSHOWDBS , and DHCPDBSHOW commands dump the information
stored in the lease database files. The dumped lease information includes:
• MAC address
• MAC address type
• MAC address length (octets)
• IP address
• Start of lease (UTC)
• Lease expiration (UTC)
• Time when lease can be extended (UTC)
• Time when host last renewed or acquired this lease (UTC)
• IP address of server owning the lease
• Host name (without domain)
• Domain name
7–62 Configuring the DHCP Server