Technical data

Configuring the DHCP Server
7.5 Using DHCP GUI to Configure DHCP
Assign Name by Hardware Addr
Specifies whether you can assign host names by the hardware address. If you
choose True, the client computer always has the same name, even if its IP
address changes; however, to do so, the client must remain in the same domain.
This option is appropriate for sites supporting dynamic updating of the name
service. When you select this policy, the server maintains a binding of the client’s
unique identifier to the name the client first acquires.
If the name service does not dynamically update, the new name-IP address
mapping implied by this policy is not available to other clients until you bring the
name service up to date by another mechanism. This means dumping data from
the database and using it to update the name service manually. The following are
valid values:
False: Disable assignment of host names by hardware addresses. Default.
True: Enable assignment of host names by hardware addresses. Use the naming
method defined in the NAMEPOOL. file.
Assign Name by IP Addr
Specifies whether you can assign host names by an IP address. If you choose
True, the client receives its name from the name service as a result of a
gethostbyaddr routine call. Also, when a client computer moves, it can receive a
new name from the name service. The following are valid values:
False: Host names cannot be assigned by IP addresses. The DHCP server does not
issue a
gethostbyaddr routine call. Instead, the session uses the naming
method defined in the NAMEPOOL. file.
True: Host names can be assigned by IP addresses. Default.
Auto Release Old Lease
Set this to True if you want to automatically delete leases when the client changes
its network. For example, if the client:
• Receives an address on subnet A
• Then moves to subnet B
The server releases the leased IP address on subnet A even though the leased IP
address on subnet A is still valid.
The default setting is False.
Note
Some hardware configurations use a MAC address or client identifier
that is the same regardless of which interface you are configuring. To the
DHCP server, two interfaces of a client of this type can appear to be a
single client that has changed networks. Do not autorelease these leases.
Auto Reread Config File
Instructs the server to see if the DHCPCAP. file has changed, indicated by the
timestamp. This occurs each time a client requires a configuration. If the file
changes, the server rereads and reparses the DHCPCAP. file.
The default is True.
7–26 Configuring the DHCP Server