Configuring DHCP Server |
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Topics on this page: Guidelines for Creating Address Pools | Adding Address Pools | Viewing, Modifying, and Deleting Address Pools | Excluding IP Addresses from a Pool | Viewing IP Address Assignments |
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This topic describes how to configure the DHCP server feature on your ADSL/Ethernet router. See DHCP Configuration Overview for an explanation of the DHCP protocol. To set up DHCP server, you first define the ranges of IP addresses that you want to be distributed to your PCs, called DHCP server address pools. |
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Before you begin, be sure to configure your PCs to accept DHCP information assigned by a DHCP server. |
Guidelines for Creating DHCP Server Address PoolsAn IP address pool typically includes a range private addresses that you define. LAN administrators often define private IP addresses for use only on their networks. See Overview of Network Address Translation for an explanation of private IP addresses. You can also use DHCP server pools to distribute multiple public IP addresses, if, for example, these are to be shared among a larger set of LAN computers. You can create up to two DHCP server address pools. You can define a single pool with addresses that can be assigned to your LAN PCs (connected via the Ethernet port) and to a USB-connected computer, as long you have assigned to the USB and Ethernet interfaces static IP addresses that place them in the same subnet. For example, assume you assigned the following addresses to the Ethernet and USB interfaces: Ethernet interface (eth-0): IP address 10.0.0.2, mask 255.255.255.0 USB interface (usb-0): IP address 10.0.0.3, mask 255.255.255.0 Then you could create a single pool for assignment to all your PCs: Pool 0: 10.0.0.4 through 10.0.0.16, mask 255.255.255.0 You can create a second pool -- which must be in a different subnet than the first -- if either of these circumstances apply:
Pool 1: 10.0.2.2 through 10.0.2.10, mask 255.255.255.0 The DHCP server distributes addresses to computers connected to a given device interface only when that interface is in the same subnet as the pool addresses. In the examples shown above, the IP addresses in pool 0 would be assigned only over the Ethernet and USB interfaces, and the addresses in pool 1 would only be assigned only over the Wireless LAN interface. Adding DHCP Server Address PoolsFollow these instructions to create an IP address pool:
Depending on your preconfigured settings, the table may display up to two address pools, each in a row, or may be empty.
A confirmation page displays briefly to indicate that the pool has been added successfully. After a few seconds, the DHCP Server Pool - Add page displays with the newly added pool.
Viewing, Modifying, and Deleting Address PoolsTo view, modify, or delete an existing address pool, display the DHCP Server Configuration page, then click the icons in the corresponding row in the address pool table.
When you are done making modifications, and then click Save Changes. Use the Write Settings to Flash feature to save your changes to permanent memory. Excluding IP Addresses from a PoolIf you have IP addresses that are designated for fixed use with specific devices, or for some other reason you do not want to make them available to your network, you can exclude them from the pool. On the DHCP Server Configuration Page, click in the row corresponding to the pool you want to modify. On the DHCP Server Pool - Modify page, type each address to be excluded in the Excluded IP Field and click Add. When you are done specifying excluded addresses, click Save Changes, and then use the Write Settings to Flash feature to save your changes to permanent memory . Viewing Current IP Address AssignmentsWhen your ADSL/Ethernet router functions as a DHCP server for your LAN, it keeps a record of any addresses it has leased to your computers. To view a table of all current IP address assignments, display the DHCP Server Configuration page, and then click Address Table. The DHCP Server Address Table lists any IP addresses that are currently leased to your computers. For each leased address, the table lists the following information:
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