TP-Link TD854W

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 DHCP Mode: Options available are None, DHCP Relay and DHCP Server.
1) None: In this mode, the Modem Router will do nothing when the host requests an IP address
by DHCP protocol. The screen will be shown as in Figure 4-9.
Figure 4-9
2) DHCP Relay: In this mode, the Router will work as a DHCP Relay. A DHCP relay is a device
that forwards DHCP data between computers that request IP addresses and the DHCP
server that assigns the addresses. Each of the device's interfaces can be configured as a
DHCP relay. In this mode, the DHCP requests from local PCs will be forwarded to the DHCP
server running on WAN side.
Figure 4-10
 Relay Server: Enter the IP Address of the DHCP server running on WAN side.
3) DHCP Server: Select this mode, then the screen will be shown as in Figure 4-11. The Router
will work as a DHCP Server; it becomes the default gateway for DHCP client connected to it.
That device on your local network must be set as a DHCP client to obtain the IP address
automatically. By default, the DHCP Server is enabled.