TP-Link TL-MR3020 User Manual page 54

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. It is not recommended that you change the default MTU Size
unless required by your ISP.
Primary/Secondary DNS - (Optional) Enter one or two DNS addresses in dotted-decimal
notation provided by your ISP.
3. If your ISP provides a PPPoE connection, select PPPoE/Russia PPPoE option. You
should enter the following parameters (Figure 4-14):
User Name/Password - Enter the User Name and Password provided by your ISP. These
fields are case-sensitive.
Secondary Connection - It's available only for PPPoE Connection. If your ISP provides an
extra Connection type such as Dynamic/Static IP to connect to a local area network, then
you can check the radio button of Dynamic/Static IP to activate this secondary connection.
TL-MR3020
Figure 4-14 WAN - PPPoE
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Portable 3G/3.75G Wireless N Router