TP-Link TL-R402M User Manual page 22

You should type the following parameters into the spaces provided:
IP Address - Enter the IP address in dotted-decimal notation provided by your ISP
Subnet Mask - Enter the subnet Mask in dotted-decimal notation provided by your ISP,
usually is 255.255.255.0
Default Gateway: (Optional) Enter the gateway IP address in dotted-decimal notation
provided by your ISP
MTU Size - The normal MTU (Maximum Transmission Unit) value for most Ethernet
networks is 1500 Bytes. For some ISPs you may need to modify the MTU. But this is rarely
required, and should not be done unless you are sure it is necessary for your ISP connection
Primary DNS - (Optional) Type the DNS address in dotted-decimal notation provided by
your ISP
Secondary DNS - (Optional) Type another DNS address in dotted-decimal notation
provided by your ISP if provided
3. If you choose PPPoE, you should enter the following parameters (Figure 4-6):
TL-R402M
Figure 4-5 WAN - Static IP
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Cable/DSL Router User Guide