To Enable DHCP Server

1    Scroll down the DHCP Server page. At DHCP Server Mode, select 'DHCP Server'.

2    Enter the following entries.

Use Default Range Click on the box to enable/disable this option. A tick indicates that this option is enabled.
enabled: IP address range lie within 192.168.1.2 - 192.168.1.21
disabled: You may defined your own specific range of IP address, e.g. 192.168.1.2 - 192.168.1.253. 
Starting IP address Enter the first IP address in which the Router will assign when there is a PC requesting for an IP address.
Ending IP address Enter the last IP address that Router will assign when there is a PC requesting for an IP address.
Default lease time Enter the length of time a DHCP client (your PCs) can use an assigned IP address before it must renew its configuration with the DHCP server (Router).
Maximum lease time Enter the maximum length of time a DHCP client (your PCs) can use an assigned IP address before it must renew its configuration with the DHCP server (Router).
Use Router as DNS Server Click on the box to enable/disable this option. A tick indicates that this option is enabled.
Enabled: Allows your Router
to perform the function of DNS Server. Your Router will translate names of network nodes into addresses and vice versa.
Disabled: Your Router will not perform the translation of network nodes to names and vice versa. You will need to specify the DNS Server address at the Primary/Secondary DNS Server Address entry which DNS Clients will get the DNS from. 
Primary DNS Server Address Enter the IP address of a primary DNS Server which the DNS Clients will request DNS from.
Secondary DNS Server Address Enter the IP address of a secondary DNS Server which the DNS Clients will request DNS from.
Use Router as default Gateway  Enable this option for the Router to act as a gateway.

3    Click 'Advanced options...' for more options. You may overwrite the current selections.

Default lease time The default time (43200 seconds) of a DHCP client (your PCs) can use an assigned IP address before it must renew its configuration with the DHCP server (the ADSL Router). 
Allow Bootp This option determines whether or not DHCP server can respond to BOOTP requests.
By default, the value is true (DHCP server responds to BOOTP queries).
Max lease time The maximum time (86400 seconds) that is assigned to a leased DHCP Client if the client does not ask for a specific expiry time.
Allow Unknown Clients This option enable/disable the dynamic assignment of addresses to unknown clients.
By default, the value is true (IP addresses can be dynamically assigned to unknown clients).
Enabled The status of DHCP server, whether it is being enabled or disabled.
By default, the value is true (DHCP server is enabled. You can set the DHCP Server configurations).

4    Click 'Change' to apply any changes at the Options page.
5    Click 'Apply' at the DHCP Server Setup page to apply the changes.
6    To save the changes permanently, click Save Config (Configuration option). Changes that are not saved will be lost the next time you power off or restart your Router.
7    Please proceed to ensure that the IP Address of your Ethernet Card is set to dynamic address. (See Ethernet Card Configuration (optional) - For Dynamic IP Address).

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