In addition to the DHCP server feature, the ADSL Router supports the DHCP relay function. When the ADSL Router is configured as DHCP server, it assigns the IP addresses to the LAN clients. When the ADSL Router is configured as DHCP relay, it is responsible for forwarding the requests and responses negotiating between the DHCP clients and the server. See figure 11.
Figure 11 (Example of a DHCP Relay configuration)
By turning off the DHCP server and relay the network administrator must carefully configure the IP address, Subnet Mask and DNS settings of every computer on your network. Do not assign the same IP address to more than one computer and your ADSL Router must be on the same subnet as all the other computers.
The apply button will temporarily save this connection. To make the change permanent you need to click on Save Settings (at the side of the page). At the system commands page, click on Save All.
4.5.2 Changing the ADSL Router IP address
You can change the ADSL Router’s IP address by, clicking Setup and under LAN Setup, select Management. This will bring up the screen shown in Figure 12.
4.5.2.1Static IP address assignment
Your ADSL Router’s default IP address and subnet mask are 192.168.1.1/255.255.255.0; this subnet mask will allow the ADSL Router to support 254 users. If you want to support a larger number of users you can change the subnet mask; but remember, the DHCP server is defaulted to only give out 255 IP addresses. Further remember that if you change your gateways’ IP address and you have DHCP enabled, the DHCP configuration must reside within the same subnet
The default gateway is the routing device used to forward all traffic that is not addressed to a station within the local subnet. Your ISP will provide you with the default gateway Address. Figure 12 shows a default gateway address of 203.125.64.1 because this was the default gateway defined when the CLIP connection was configured.
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