Advanced configuration, Network setup – Linksys WRT120N User Manual

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Chapter 3

Advanced Configuration


Wireless-N Home Router

Host Name and Domain Name

These fields allow you to

supply a host and domain name for the Router. Some ISPs,
usually cable ISPs, require these names as identification.
You may have to check with your ISP to see if your
broadband Internet service has been configured with a
host and domain name. In most cases, leaving these fields
blank will work.


MTU is the Maximum Transmission Unit. It specifies

the largest packet size permitted for Internet transmission.
Select Manual if you want to manually enter the largest
packet size that is transmitted. To have the Router select
the best MTU for your Internet connection, keep the
default, Auto.


When Manual is selected in the MTU field, this option

is enabled. Leave this value in the 1200 to 1500 range. The
default size depends on the Internet Connection Type:

DHCP, Static IP, or Telstra: 1500

PPPoE: 1492

PPTP or L2TP: 1460

Network Setup

The Network Setup section changes the settings of the
local network. Wireless setup is performed through the
Wireless tab.

Router IP

This presents both the Router’s Local IP Address and
Subnet Mask as seen by your network.

Router IP

DHCP Server Setting

The settings allow you to configure the Router’s Dynamic
Host Configuration Protocol (DHCP) server function. The
Router can be used as a DHCP server for your network. A
DHCP server automatically assigns an IP address to each
computer on your network. If you choose to enable the
Router’s DHCP server option, make sure there is no other
DHCP server on your network.

DHCP Server Setting

DHCP Server

DHCP is enabled by factory default. If you

already have a DHCP server on your network, or you do
not want a DHCP server, then select Disabled (no other
DHCP features will be available).

DHCP Reservation

Click this button if you want to assign

a fixed local IP address to a MAC address.

DHCP Reservation

You will see a list of DHCP clients with the following
information: Client Name, Interface, IP Address, and
MAC Address.

DHCP Reservation

Select Clients from DHCP Table

Click the Select

check box to reserve a client’s IP address. Then click
Add Clients.

Manually Adding Client

To manually assign an IP

address, enter the client’s name in the Enter Client
field. Enter the IP address you want it to have in
the Assign IP Address field. Enter its MAC address in the
To This MAC Address field. Then click Add.

Clients Already Reserved

A list of DHCP clients and their fixed local IP addresses
will be displayed at the bottom of the screen. If you
want to remove a client from this list, click Remove.

Click Save Settings to apply your changes, or click
Cancel Changes to clear your changes. To update the
on-screen information, click Refresh. To exit this screen
and return to the Basic Setup screen, click Close.

Start IP Address

Enter a value for the DHCP server to

start with when issuing IP addresses. Because the Router’s
default IP address is, the Start IP Address must
be or greater, but smaller than
The default is

Maximum Number of Users

Enter the maximum number

of computers that you want the DHCP server to assign IP