Changing the Dhcp Server Settings

When changing the IP Address of the Gateway choose an address that will be unique in your network and in your network’s subnet. The default IP Address of the Gateway is 192.168.1.1.

When you change the IP Address of the Gateway you must reboot all computers that gain their IP address from the Gateway before they will be able to access the Internet.

If you are using static addresses for your PCs you must alter the network configuration on each PC so that they have an IP address within the same subnet as the Gateway and have their default Gateway set as the Gateway’s IP address.

If you reconfigure your network you may need to change your Subnet Mask. The Subnet Mask detemines how many addresses are available to your network. The default Subnet Mask is 255.255.255.0.

For example if the IP Address of your Gateway is 192.168.1.1 and the Subnet Mask of your network is 255.255.255.0 then your network can have a maximum of 254 addresses from 192.168.1.1 to 192.168.1.254 (192.168.1.0 and 192.168.1.255 are reserved by the subnet and are not available for use).

When you change the IP Address or Subnet Mask of the Gateway you should review the DHCP Server settings as described below.

This section allows to you enable, disable and configure the settings of the Gateway’s DHCP server.

If you intend to use the Gateway to control the permissions of individual machines on your network then you must use the Gateway’s DHCP server to allocate addresses (or use static addressing). If you use another DHCP server you may get unexpected results. See “PC Privileges” on page 47.

To enable the DHCP Server ensure that the Enable check box is ticked. To disable the DHCP Server ensure that the Enable check box is cleared.

Set the IP Pool Start Address and IP Pool End Address to the first and last address you want the Gateway to allocate to computers. The IP address pool must be contained within the subnet as defined in “Changing the LAN Settings” on page 35. The default start and end addresses are 192.168.1.100 and 192.168.1.200.

The Local Domain Server is set to Domain as default.

If you have a WINS Server on your network enter its IP address in the WINS Server box. The gateway will pass this information on to all Windows PCs that obtain an address from its DHCP server.

If you have a 3Com NBX Call Processor on your network enter its IP address in the 3Com NBX Call Processor box. The 3Com NBX Call Processor acts as a switchboard for voice-over-IP phones and the gateway will pass on this information.

If you will be using One-to-One NAT you must set up a range that is one less than the number of public addresses allocated to you by your ISP. The DHCP range must also be identical to the range specified when you set up One-to-One NAT. See “Setting up One-to-One NAT” on page 45.