D-Link NetDefendOS User Manual page 400

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10.4.13.240 00-1e-0b-a0-c6-5f
10.4.13.241 00-0c-29-04-f8-3c
10.4.13.242 00-1e-0b-aa-ae-11
10.4.13.243 00-1c-c4-36-6c-c4
10.4.13.244 00-00-00-00-02-14
10.4.13.254 00-00-00-00-02-54
10.4.13.1 00-12-79-3b-dd-45
10.4.13.2 00-12-79-c4-06-e7
10.4.13.3 *00-a0-f8-23-45-a3
10.4.13.4 *00-0e-7f-4b-e2-29
The asterisk "*" before a MAC address means that the DHCP server does not track the client using
the MAC address but instead tracks the client through a client identifier which the client has given
to the server.
To display all DHCP information use the dhcpserver command with no options. Each individually
configured DHCP server is referred to as a Rule which is given a unique number. This number is
used to identify which lease belongs to which server in the CLI output. To see just the configured
DHCP servers, use the command:
gw-world:/> dhcpserver -show -rules
Tip: The lease database is saved in non-volatile memory
The DHCP lease database is periodically saved to non-volatile memory so that most
leases are remembered by NetDefendOS after a system restart. A DHCP advanced
setting can be adjusted by the administrator to control how often the database is saved.
The DHCP Server Blacklist
Sometimes, an IP address offered in a lease is rejected by the client. This may because the client
detects that the IP address is already in use by issuing an ARP request. When this happens, the
NetDefendOS DHCP server adds the IP address to its own blacklist.
The CLI can be used to clear the DHCP server blacklist with the command:
gw-world:/> dhcpserver -release=blacklist
Additional Server Settings
A NetDefendOS DHCP server can have two other sets of objects associated with it:
• Static Hosts.
• Custom Options.
The illustration below shows the relationship between these objects.
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ACTIVE(STATIC)
ACTIVE(STATIC)
ACTIVE(STATIC)
INACTIVE(STATIC)
INACTIVE(STATIC)
INACTIVE(STATIC)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
400
Chapter 5: DHCP Services