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ZyXEL X-550 User’s Guide
Example:
Your Wireless router uses 192.168.0.1 for the IP address. You've assigned a computer that you want to
designate as a Web server with a static IP address of 192.168.0.3. You've assigned another computer that
you want to designate as an FTP server with a static IP address of 192.168.0.4. Therefore the starting IP
address for your DHCP IP address range needs to be 5 or greater.
Example:
Suppose you configure the DHCP Server to manage addresses From 100 To 199. This means that 3 to 99
and 200 to 254 are NOT managed by the DHCP Server. Computers or devices that use addresses from
these ranges MUST be manually configured. Suppose you have a web server computer that has a manually
configured address of 192.168.0.100. Because this falls within the "managed range" be sure to create a
reservation for this address and match it to the relevant computer (see Static DHCP Client below).
DHCP Lease Time:
The amount of time that a computer may have an IP address before it is required to renew the lease. The
initial lease designates the amount of time before the lease expires. If the client wishes to retain the address
when the lease is expired then a new lease is established. If the lease expires and the address is no longer
needed than another client may use the address.
Always Broadcast:
If all the computers on the LAN successfully obtain their IP addresses from the router's DHCP server as
expected, this option can remain disabled. However, if one of the computers on the LAN fails to obtain an
IP address from the router's DHCP server, it may have an old DHCP client that incorrectly turns off the
broadcast flag of DHCP packets. Enabling this option will cause the router to always broadcast its
responses to all clients, thereby working around the problem, at the cost of increased broadcast traffic on
the LAN.
NUMBER OF DYNAMIC DHCP CLIENTS
In this section you can see what LAN devices are currently leasing IP addresses.
Revoke:
The Revoke option is available for the situation in which the lease table becomes full or nearly full, you
need to recover space in the table for new entries, and you know that some of the currently allocated leases
are no longer needed. Clicking Revoke cancels the lease for a specific LAN device and frees an entry in
the lease table. Do this only if the device no longer needs the leased IP address, because, for example, it has
been removed from the network.
ADD/EDIT STATIC DHCP CLIENT
This option lets you reserve IP addresses, and assign the same IP address to the network device with the
specified MAC address any time it requests an IP address. This is almost the same as if a device has a static
IP address except that it must still request an IP address from the Wireless router. The Wireless router will
provide the device the same IP address every time. Static DHCP is helpful for server computers on the
local network that are hosting applications such as Web and FTP. Servers on your network should either
use a static IP address or use this option.
MAC Address:
To input the MAC address of your system, enter it in manually or connect to the Wireless router's
Web-Management interface from the system and click the Clone Your PC’s MAC Address button.
A MAC address is usually located on a sticker on the bottom of a network device. The MAC address is
comprised of twelve digits. Each pair of hexadecimal digits are usually separated by dashes or colons such
as 00-0D-88-11-22-33 or 00:0D:88:11:22:33. If your network device is a computer and the network card is
already located inside the computer, you can connect to the Wireless router from the computer and click the
Clone Your PC’s MAC Address button to enter the MAC address.
As an alternative, you can locate a MAC address in a specific operating system by following the steps
below:
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