Linksys NR041 Router Manual PDF (Setup & Configuration Guide)

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Cable/DSL 4-Port Router

Under the Help tab, you’ll find links to all of the utility’s internal support doc-

umentation, including the application that upgrades the Router’s firmware.

Network Everywhere Website

Clicking this link will take you to Network

Everywhere’s website,

www.NetworkEverywhere.com

, provided you are con-

nected to the Internet.

Online manual in PDF format

and

Adobe Website

Clicking the Online man-

ual in PDF format link will take you to the latest version of the user guide for

this Router. The guide will be in Adobe Acrobat Portable Document File (.pdf)

format. You will need the Adobe Acrobat Reader to view this pdf. If you do not

have the Acrobat Reader, click the Adobe Website link to download it. These

links work only if you are connected to the Internet.

Upgrade

Firmware

New

firmware

versions

are

posted

www.NetworkEverywhere.com

and can be downloaded for free.

If the Router

can access the Internet already, there’s no need to download a newer firmware

version, unless that version has a new feature that you want to use. (To learn

about

any

new

firmware

with

new

features,

visit

www.NetworkEverywhere.com

.) Loading new firmware onto the Router does

not always enhance the speed or the quality of your connection.

Help

Figure 6-11

Network Everywhere

™

Series

The Log tab provides you with a log of all incoming and outgoing URLs or IP

addresses for your Internet connection.

Access Log

To access activity logs, select the

Enable

option next to Access

Log. This function can be disabled by clicking the

Disable

radio button.

Temporary logs can be accessed from the Log screen by clicking either the

Incoming Access Log

Outgoing Access Log

button. The Incoming Access

Log gives you a log of all the incoming Internet traffic while the Outgoing

Access Log lists all the URLs and IP addresses of Internet sites that users on

your network have accessed.

To clear the value you’ve entered on this page, click

Cancel

and re-enter infor-

mation. To apply any settings you’ve altered on this page, click the

Apply

but-

ton. Once all settings are correct, click

Continue

Log

Figure 6-10

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Cable/DSL 4-Port Router

Network Everywhere

™

Series

IP filters block specific internal users from accessing the Internet and enable

Virtual Private Network (VPN) sessions. You can set up filters by using IP

addresses or network port numbers (or a range of ports).

Filtered Private IP Range

•

To set up a filter using IP addresses, enter the range of IP addresses you wish

to filter in the IP address fields. Users with filtered IP addresses will not be

able to access the Internet at all. If you only want to filter one IP address

instead of a range of IP addresses, enter the same value into both fields. For

instance, if you wish to filter the PC with the IP address of 192.168.1.5, enter

into both fields on one line: 192.168.1.

~ 192.168.1.

. Click the

Apply

button when finished.

IP Filtering

Figure 6-13

To upgrade the Router’s firmware:

Download the firmware upgrade file from

www.NetworkEverywhere.com

and extract the file using WinZip.

2. Select the

Help

tab (see Figure 6-14).

3. Click

Upgrade Firmware

to display a new window (see Figure 6-12).

4. Click the

Browse

button to find the firmware upgrade file you extracted.

5. Double-click the

firmware file

you extracted. Click the

Upgrade

button

(see Figure 6-12), and follow the on-screen instructions.

The following instructions are for advanced users or users whose setup needs

require special configuration. When you click the Advanced tab, you will be

able to set up these features. There are six additional tabs available.

•

Filters - Filters block specific internal users from Internet access and enable

Virtual Private Network (VPN) sessions.

•

Forwarding - Sets up public services on your network.

•

Dynamic Routing - Sets up the Router so it will automatically adjust to phys-

ical changes in the network’s layout.

•

Static Routing - Sets up static routes needed when network information must

travel to a specific host or network.

•

DMZ Host - Allows one local user to be exposed to the Internet for use of spe-

cial-purpose services such as online gaming or videoconferencing.

•

MAC Address Cloning - Allows you to “clone” your Ethernet adapter’s MAC

address onto the Router.

Note:

By upgrading the Router’s firmware, you may lose the Router’s

configuration settings.

Figure 6-12

Advanced

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•

Point-to-Point Tunneling Protocol is the method used to enable VPN

sessions.

PPTP Pass Through is enabled by default.

•

To disable this feature, click on

Disable

next to

PPTP Pass Through

L2TP Pass Through

•

This feature lets you use L2TP Pass Through.

L2TP Pass Through is enabled

by default.

•

To disable this feature, click on

Disable

next to

L2TP Pass Through

Remote Management

•

This feature allows you to manage the Router from a remote location, via the

Internet.

To enable this feature, click on

Enable,

and enter the desired port

number (default is 8080). Click the

Apply

button and then the

Continue

but-

ton. Remote Management must be activated before you can manage the

Router from a remote location. If you wish to use this feature on the brows-

er, enter

http:\\<WAN IP Address>:8080.

(Enter your specific WAN IP

Address in place of <WAN IP Address>.)

•

To disable this feature, click on

Disable

MTU (Maximum Transmission Unit)

•

This feature specifies the largest packet size permitted for network transmis-

sion. Select

Enable

and enter the value desired.

You should leave this value

in the 1200 to 1500 range.

Most DSL users should use the value

1492

For

static and dynamic connections, the default MTU value is set at

1500

when

disabled. For PPPoE connections, the default MTU value is set at

1492

when

disabled.

Click on the

Apply

button and then the

Continue

button to save your changes.

Filtered Private Port Range

•

To filter users by network port number, enter a network port number or a

range of network ports. Select the protocol for each port number you want to

filter,

TCP

UDP

Enter the port numbers you want to filter in the port

numbers fields.

Users connected to the Router will no longer be able to

access any port number listed there. Click the

Apply

button when you’re done.

Private MAC Filter

•

This feature filters the Ethernet adapter’s specific MAC address from going

out to the Internet.

•

To check your Ethernet adapter’s

MAC address, run

winipcfg

ipconfig

the

command

prompt, depending on which

Windows operating system you

are using.

To set the MAC filter,

click

the

Edit

MAC Filter

Setting

button.

When a second

window appears (see Figure 6-

14), select the range in the drop-

down box, and at the MAC num-

ber prompt, enter the 12-digit

MAC address you want to filter.

Click the

Apply

button and the

Continue

button, before closing

the window. For information on

obtaining a MAC address, go to “Appendix F: Finding the MAC Address and

IP Address for Your Ethernet Adapter.”

Block WAN Requests

•

By enabling the Block WAN Request feature, you can prevent your network

from being “pinged,” or detected, by other Internet users. The Block WAN

Request feature also reinforces your network security by hiding your network

ports. Both functions of the Block WAN Request feature make it more diffi-

cult for outside users to work their way into your network. This feature is

enabled by default.

IPSec Pass Through

•

This feature lets you use IPSec Pass Through.

IPSec Pass Through is enabled

by default.

•

To disable IPSec Pass Through, click on

Disable.

PPTP Pass Through

Figure 6-14

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2. Next to the name of the application, enter the

number

range

of the

external port(s) used by the server or Internet application in the Ext. Port

column. Check with the Internet application software documentation for

more information.

On the same line, select

UDP

TCP

, or select both protocols.

4. Enter the

IP address

of the server that you want the Internet users to be

able to access. For information about finding the IP address, go to

“Appendix F: Finding the MAC Address and IP Address for Your Ethernet

Adapter.”

5. Check the

Enable

box to enable the services you have defined. Port Range

Forwarding will not function if the

Enable

button is left unchecked. This is

disabled (unchecked) by default.

Configure as many entries as needed—the Router supports up to 10 ranges

of ports. Click the

Apply

button and then the

Continue

button when you

are done.

UPnP Forwarding

Click the

View UPnP Forwarding

screen to access the UPnP Forwarding

screen, shown in Figure 6-16. This screen displays preset application settings

as well as options for customization of port services for other applications.

The Preset Applications at the top of the list are among the most widely used

Internet applications. They include the following:

•

FTP

(File Transfer Protocol)

A protocol used to transfer files over a TCP/IP

network (Internet, UNIX, etc.). For example, after developing the HTML

pages for a website on a local machine, web developers typically upload the

files to the web server using FTP. FTP includes functions to log onto the net-

work, list directories, and copy files. FTP operations can be performed by

typing commands at a command prompt or via an FTP utility running under

a graphical interface such as Windows. FTP transfers can also be initiated

from within a web browser by entering the URL preceded by ftp://.

•

Telnet

A terminal emulation protocol commonly used on Internet and

TCP/IP-based networks. It allows a user at a terminal or computer to log onto

a remote device and run a program.

Port Range Forwarding sets up public services on your network, such as web

servers, ftp servers, e-mail servers, or other specialized Internet applications.

(Specialized Internet applications are any applications that use Internet access

to perform functions such as videoconferencing or online gaming. Some

Internet applications may not require any forwarding.) When users send this

type of request to your network via the Internet, the Router will forward those

requests to the appropriate PC.

Before using Forwarding, the Router’s DHCP

function must be disabled under the DHCP tab and the Router must be assigned

a new static LAN IP address because the IP address may change when using

the DHCP server.

If you need to forward all ports to one PC, see the “DMZ” section.

To add a server using Port Range Forwarding:

1. Enter the

name

of the application in the appropriate Customized

Applications field.

Port Range Forwarding

Figure 6-15

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•

HTTP

(HyperText Transport Protocol)

The communications protocol used

to connect to servers on the World Wide Web. Its primary function is to

establish a connection with a web server and transmit HTML pages to the

client web browser.

•

POP3

(Post Office Protocol 3)

A standard mail server commonly used on

the Internet. It provides a message store that holds incoming e-mail until

users log on and download it. POP3 is a simple system with little selectivity.

All pending messages and attachments are downloaded at the same time.

POP3 uses the SMTP messaging protocol. (SMTP may also need to be for-

warded.)

•

NNTP

(Network News Transfer Protocol)

The protocol used to connect to

Usenet groups on the Internet.

•

SNMP

(Simple Network Management Protocol)

A widely used network

monitoring and control protocol. Data is passed from SNMP agents, which

are hardware and/or software processes reporting activity in each network

device (hub, router, bridge, etc.) to the workstation console used to oversee

the network. The agents return information contained in a MIB

(Management Information Base), which is a data structure that defines what

is obtainable from the device and what can be controlled (turned off, on,

etc.).

You must check the

Enable

box to enable the applications you have defined.

To add a server using UPnP Forwarding:

1. Enter the

name

of the application in the appropriate Application Name

field.

Next to the name of the application, enter the

number

of the external port

used by the server in the Ext. Port column. Check with the Internet appli-

cation software documentation for more information.

On the same line, select

UDP

TCP

4. Enter the

number

of the internal port used by the server in the Int. Port col-

umn.

Check with the Internet application software documentation for more

information.

•

SMTP

(Simple Mail Transfer Protocol)

The standard e-mail protocol on the

Internet. It is a TCP/IP protocol that defines the message format and the mes-

sage transfer agent (MTA), which stores and forwards the mail.

•

DNS

(Domain Name System)

The way that Internet domain names are

located and translated into IP addresses. A domain name is a meaningful and

easy-to-remember “handle” for an Internet address.

•

TFTP

(Trivial File Transfer Protocol)

A version of the TCP/IP FTP proto-

col that has no directory or password capability.

•

Finger

A UNIX command widely used on the Internet to find out informa-

tion about a particular user, such as his or her telephone number, whether the

user is currently logged on, and the last time the user was logged on. The per-

son being “fingered” must have placed his or her profile on the system in

order for the information to be available. Fingering requires entering the full

user@domain address, for example, [email protected].

Figure 6-16

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