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Chapter 4: Networks
Dynamic DNS
Mechanism by which the DNS server learns the assigned IP address and fully
qualified domain name of a wireless client. There are three options:
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10.
Optional. Configure Advanced DHCP Custom Options for the DHCP server running
on the BSC as follows.
Option
Select the predefined DHCP server option you wish to configure from the Option
(predefined)
drop-down menu.
The Name, Code, and Data Type fields are automatically filled for all predefined
DHCP server options.
Option (custom)
You can select custom from the Option menu if you wish to define your own DHCP
server option.
Optional. If defining your own custom DHCP server option, you must enter a
meaningful name for the option in the Name field, enter the numeric code associated
with the option in the Code field, and select the option's datatype from the Data Type
menu.
Value
Enter the Value to which to set the predefined or custom DHCP server option.
The entered value must correspond to the datatype selected for the option.
Repeat (specifying Option and Value) for each DHCP server option you wish to
configure. Click Row Management... if you need to add rows to support additional
DHCP server options.
Click Save to save the settings to the BSC database.
11.
You might be prompted to restart the BSC. We recommend that you do not restart the
BSC until you have completely finished configuring the BSC for use in your network.
Configuring the BSC to Assign Fixed IP Addresses
You can use both dynamic (via DHCP) and fixed IP addressing for clients. The addressing
methods are not mutually exclusive. See "Configuring the BSC DHCP Server" on page 4-
11 for information about running a DHCP server on the BSC to assign IP addresses to the
wireless clients dynamically.
A device must be added to the BSC's internal connection table and assigned a role
before its traffic can transit the BSC firewall. You must assign a fixed IP address to any
device that is not receiving its IP address via DHCP to add that device to the BSC
connection table.
4-14
Ad Hoc - DNS server looks for a valid host name as specified in the FQDN
option and in the client hostname option sent by the client. If this information is
available, the DNS server updates its records with the client's hostname. If not,
the server will not have a host name for the client, and cannot do a DNS update.
If there is already a record with the same hostname in the DNS server as
submitted by the client, no update occurs. This prevents a client from spoofing an
existing network server. Upon expiration of the client's lease or receipt of a
DHCPRELEASE message from the client, the DHCP server removes the client's
records from the DNS database.
Interim - Same as the Ad Hoc option except the client is allowed to communicate
directly with the DNS server to update records. This mode should be used with
care, because there is no mediation or checking of information supplied by the
client.
Disabled - No DNS update occurs. Other clients on the network will be unable to
locate this client using DNS.
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