Linksys BEFSR41W Router Manual PDF (Setup & Configuration Guide)

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For

This screen displays preset application settings as well as options for cus-

tomization of port services for other applications.

The Preset Applications 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 Web site on a local machine, they are typically uploaded to the

Web server using FTP. FTP includes functions to log on to the network, list

directories, and copy files. FTP operations can be performed by typing com-

mands 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 with ftp://.

Port Forwarding

Port

Figure 6-13

EtherFast

Cable/DSL Wireless-Ready Router with 4-Port Switch

•

Click on

Apply

to save any changes.

Using IPSec Pass Through

•

This feature lets you use IPSec Pass Through.

To use this feature, click on

Enable

next to “IPSec Pass Through,”

then click on

Apply

•

To disable IPSec Pass Through, click on

Disable,

and then click on

Apply

Using PPTP Pass Through

•

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

(Virtual Private Network) sessions.

To enable this feature, click on

Enable

next to PPTP Pass Through, then click

Apply

•

To disable this feature, click on

Disable

next to PPTP Pass Through, then

click on

Apply

Using L2TP Pass Through

•

This feature lets you use L2TP Pass Through.

To use this feature, click on

Enable

next to “L2TP Pass Through,” and then click on

Apply

•

To disable L2TP Pass Through, click on

Disable,

and then click on

Apply

Using Remote Management

•

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

Internet.

To enable this feature, click on

Enable,

and enter the desired port num-

ber from 1025 to 65535 (By default it is set to 8080). Then click on

Apply

Using remote management is easy.

Once you have enabled remote management,

enter

http://<WAN IP Address>:8080

or the

Port Number

you have defined,

into the browser of any PC on the network. Press the

Enter

key.

You will then be

able to alter the Router configuration settings.

•

To disable Remote Management, click on

Disable

, then click on

Apply

Using Default MTU (Maximum Transmission Unit)

•

This feature allows you to specify the largest packet size permitted for network

transmission. Select

Enable

and enter the value desired.

It is recommended that

you leave this value within the 1200 to 1500 range.

Most DSL users should use

1492

When this function is disabled, the MTU is set at a default value of

1500

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To add a customized application in the UPnP Forwarding screen:

1. Enter the name of the application in the appropriate

Customized

Applications

field. Continue with the fields on the same line.

In the

Ext. Port

field, enter the number of the external port used by the

server.

Check

Protocol TCP

Protocol UDP

, depending on which protocol you

use.

Enter the number of the internal port.

Enter the IP address of the server that you want the Internet users to access.

Refer to your software documentation for more information about chang-

ing service port settings, if necessary.

Now, check the Enable box or the changes that you made to UPnP

Forwarding will not function.

Port Range Forwarding

Forwarding is generally used to set up a web server, ftp server, or e-mail serv-

er on your network.

The router’s DHCP function must be disabled to use

Forwarding.

Click the

View Port Range Forwarding

button to open the Port Range

Forwarding screen. (See Figure 6-14.) Port forwarding sets up public services

on your network. When users from the Internet make certain requests of your

network, the router will forward those requests to the appropriate computer.

EtherFast

Cable/DSL Wireless-Ready Router with 4-Port Switch

•

Telnet

A terminal emulation protocol commonly used on the Internet and

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

to a remote device and run a program.

•

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

message 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 telephone number, whether currently

logged on or the last time logged on. The person being “fingered” must have

placed his or her profile on the system. Fingering requires entering the full

user@domain address.

•

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 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.

•

NNTP

(Network News Transfer Protocol)

The protocol used to connect to

Usenet groups on the Internet. Usenet newsreaders support the NNTP pro-

tocol.

•

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.

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With Dynamic Routing you can automatically adjust to physical changes in the

network’s layout. Using RIP protocol, the router determines the route of the

network packets based on the fewest number of hops between the source and

the destination. The RIP protocol regularly broadcasts routing information to

other routers on the network. To set up Dynamic Routing:

1. Choose the correct working mode. Use

Gateway Mode

if your Router is

hosting your network’s connection to the Internet. Use

Router Mode

if the

router exists on a network with other routers.

2. In the

field, choose the protocol by which you transmit data on the net-

work.

3. In the

field, choose the protocol by which you receive data on the net-

work.

4. Click the

Apply

button to save your changes.

Dynamic Routing

Figure 6-15

EtherFast

Cable/DSL Wireless-Ready Router with 4-Port Switch

To add a server using Port Range Forwarding:

Enter the name of the application in the appropriate

Customized

Applications

field. Continue with the fields on the same line.

In the

Ext. Port

field, enter the number of the external port used by the

server.

Check

Protocol TCP

Protocol UDP

, depending on which protocol you

use.

Enter the IP address of the server that you want the Internet users to access.

Refer to your software documentation for more information about chang-

ing service port settings, if necessary.

Now, check the Enable box or the changes that you made to Port Range

Forwarding will not function.

Figure 6-14

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Subnet Mask

The Subnet Mask (also known as the Network Mask) deter-

mines which portion of an IP address is the network portion, and which

portion is the host portion. In the example above, the Network Mask is

255.255.255.0. This determines (by using the values 255) that the first

three numbers of a network IP address identify this particular network,

while the last digit (from 1 to 254) would identify the specific host.

Default Gateway IP

This IP address should be the IP address of the gateway

device that allows for contact between the Router and the remote network

or host.

Hop Count

This value gives the number of

nodes

that a data packet passes

through before reaching its destination.

A node is any device

on the network, such as switches, PCs, etc.

Interface

This interface tells you whether your network is on the internal

LAN or the WAN, or the external Internet.

If you are connecting to a sub-

network, select LAN.

If you’re connecting to another network through the

Internet, select WAN.

3. Click the

Apply

button to save your changes.

EtherFast

Cable/DSL Wireless-Ready Router with 4-Port Switch

If your Router is connected to more than one network, it may be necessary to

set up a static route between them. A static route is a pre-determined pathway

that network information must travel to reach a specific host or network.

Click

the

Show Routing Table

button to view the current static routing configura-

tion.

To create a static route entry:

1. Select

Static Route Entry

from the drop down list. The Cable/DSL Router

supports up to 20 static route entries.

Enter the following data to create a new static route:

Destination LAN IP

The Destination LAN IP is the address of the remote

network or host to which you want to assign a static route. Enter the IP

address of the host for which you wish to create a static route here. If you

are building a route to an entire network, be sure that the network portion

of the IP address is set to zero (0). For example, the Router’s standard IP

address is 192.168.1.1. Based on this address, the address of the network to

which the Router is connected is 192.168.1, with the last digit (1, in this

case) determining the Router’s place on the network. Therefore you

would

enter the IP address 192.168.1.0 if you want to route to the Router’s entire

network, rather than just to the Router.

Static Routing

Figure 6-16

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Page 25 / 38

MAC Address Cloning allows you to assign the Router a MAC address, which

is a 12-digit code assigned to a unique piece of hardware for identification, like

a Social Security number.

Some ISPs require that you register the MAC

address of your network card/adapter, which was connected to your cable or

DSL modem during installation.

Click on the

Clone

button to find your adapter’s MAC address and click

This clones your network adapter’s MAC address onto your Router, and pre-

vents you from having to call your ISP to change the registered MAC address

to the adapter’s MAC address.

Z Host

MAC Address Cloning

Figure 6-18

EtherFast

Cable/DSL Wireless-Ready Router with 4-Port Switch

The DMZ Host setting allows one local computer to be exposed to the Internet

for the use of special-purpose services such as Internet gaming or video-con-

ferencing.

To expose one computer, enter the computer’s IP address and click the

Apply

button. Inactivate DMZ by entering a zero (0).

DMZ Host

Figure 6-17

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