Linksys BEFSX41v1.44 Router Manual PDF (Setup & Configuration Guide)

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BEFSX41v1.44

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EtherFast

Cable/DSL Firewall Router with 4-Port Switch/VPN Endpoint

From the Forwarding tab, shown in Figure 7-37, you can set up public services

on your network, such as web servers, ftp servers, e-mail servers, or other spe-

cialized Internet applications. (Specialized Internet applications are any appli-

cations 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 computer must be assigned a new static LAN IP address because the IP

address may change when using the DHCP server.

Forwarding

Figure 7-37

Instant Broadband

Series

To create a new service, enter the name of the service in the

Service Name

field. To edit a service’s settings, select the service from the box on the

right of the screen.

From the

Protocol

drop-down menu, select the protocol type for this serv-

ice, such as TCP, UDP, or ICMP.

In the

Port Range

fields, enter the range of ports for this service.

To add a service, click the

Add

button. To edit the settings for a service,

click the

Modify

button.

To delete a service, select the service from the box on the right of the

screen. Click the

Delete

button.

Click the

Apply

button to save your changes. Click the

Cancel

button to

undo your changes. Click the

in the upper righthand corner of the

screen to close the

Add Service

window.

8. To save your settings for an Internet Access Policy, click the

Apply

button

on the

Filters

screen. To undo your changes, click the

Cancel

button on the

Filters

screen.

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EtherFast

Cable/DSL Firewall Router with 4-Port Switch/VPN Endpoint

•

Telnet

A terminal

emulation protocol

commonly used on

Internet

and

TCP/IP-based net-

works. It allows a

user at a terminal or

computer

log

onto

remote

device and run a

program.

•

SMTP

(Simple

Mail

Transfer

Protocol)

The stan-

dard e-mail proto-

col on the Internet.

It is a TCP/IP pro-

tocol 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 infor-

mation about a particular user, such as a telephone number, whether the

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

person 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.

Figure 7-38

Instant Broadband

Series

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

To add a server using Forwarding:

1. Enter the

name

of the application in the appropriate Customized

Applications field.

Next to the name of the application, enter the

number

range

of the exter-

nal port(s) used by the server or Internet application in the Ext. Port col-

umn. Check with the Internet application software documentation for more

information.

On the same line, select the protocol

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. To find the IP address, go to “Appendix G: 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 ten ranges

of ports. Click the

Apply

button and

Continue

button when you are done.

UPnP Forwarding

The UPnP Forwarding screen, shown in Figure 7-38, displays preset applica-

tion settings as well as options for customization 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 website on a local machine, they are typically uploaded

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://.

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EtherFast

Cable/DSL Firewall Router with 4-Port Switch/VPN Endpoint

Enter the IP address of the server that you want the Internet users to be able

to access. To find the IP address, go to “Appendix G: Finding the MAC

Address and IP Address for Your Ethernet Adapter.”

6. Check the

Enable

box to enable the services you have defined. UPnP

Forwarding will not function if the

Enable

button is left unchecked. This is

disabled (unchecked) by default.

Port Triggering

From the Forwarding screen, click the

Port Triggering

button to open the Port

Triggering screen, shown in Figure 7-39. From here, you can set the Router to

watch outgoing data on assigned port numbers.

The IP address of the comput-

er that sends the matching data is remembered by the Router, so that when the

requested data returns through the Router, the data is pulled back to the proper

computer by way of IP address and port mapping rules.

1. Enter the

Application Name

of the trigger.

2. Enter the

Trigger Port Range

used by the application. Check with the

Internet application for the port number needed.

Enter the

Incoming Port Range

used by the application. Check with the

Internet application for the port number needed.

Click the

Apply

button and then click the

Continue

button.

Figure 7-39

Instant Broadband

Series

•

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 selectivi-

ty. 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.

To add a server using UPnP Forwarding:

1. Enter the

name

of the application in the appropriate Application Name

field.

2. 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.

3. On the same line, select the protocol

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.

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EtherFast

Cable/DSL Firewall Router with 4-Port Switch/VPN Endpoint

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

up a static route between them. This can be done from the Static Routing

screen, shown in Figure 7-41. A static route is a pre-determined pathway that

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

From the

Static Routing tab, click the

Show Routing Table

button to view the current

static routing configuration.

To create a static route entry:

1. Select a

Static Route Entry

from the drop-down list. The Router supports

up to 20 static route entries.

To delete a Static Routing entry, select an

entry

, and click the

Delete this

entry

button.

Static Routing

Figure 7-41

Instant Broadband

Series

From the Dynamic Routing screen, shown on Figure 7-40, you can enable the

Router to automatically adjust to physical changes in the network’s layout. The

Router, using the RIP protocol, determines the network packets’ route based on

the fewest number of hops between the source and the destination. The RIP pro-

tocol regularly broadcasts routing information to other routers on the network.

To set up Dynamic Routing:

1. Choose the correct

Working Mode

Gateway Mode

should be used if the

Router is hosting your network’s connection to the Internet.

Router Mode

should be selected if the Router exists on a network with other routers. In

Router Mode, any computer connected to the Router will not be able to con-

nect to the Internet unless you have another router function as the Gateway.

Choose a

Dynamic Routing path protocol

for either transmission (TX) or

reception (RX) of network data.

Click the

Show Routing Table

button to open a chart displaying how data is

routed through your LAN.

When finished making your changes on this tab, click the

Apply

button fol-

lowed by the

Continue

button to save these changes, or click the

Cancel

but-

ton to undo your changes. For further help on this tab, click the

Help

button.

Dynamic Routing

Figure 7-40

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EtherFast

Cable/DSL Firewall Router with 4-Port Switch/VPN Endpoint

From the DMZ Host tab, shown in Figure 7-42, you can set Port 4/DMZ to

DMZ or LAN connection. Any user on the Internet can access incoming or out-

going data from the DMZ host without the use of firewall protection. This fea-

ture is used for special-purpose services such as Internet gaming and video-

conferencing. Port 4 is the only port used for DMZ, and only one computer can

be in DMZ mode.

DMZ Port

To enable or disable the DMZ port, click the

Enable

radio button or

Disable

radio button.

DMZ Host Address

Assigned by the DMZ Port:

The DMZ host is the first PC connected to

Port 4/DMZ of the Router, either directly or through a hub or switch. The

Router will only allow one PC to be the DMZ host.

DMZ Host

Figure 7-42

Instant Broadband

Series

2. 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

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 0. For example, the Router’s standard IP address

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

192.168.1, with the last digit determining the Router’s place on the network.

Therefore you would enter the IP address 192.168.1.0 if you wanted to

route to the Router’s entire network, rather than just to the Router.

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 por-

tion is the host portion. Take, for example, a network in which the Subnet

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) identifies the specific host.

Default Gateway:

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 determines the maximum number of steps between net-

work nodes that data packets will travel. A node is any device on the net-

work, such as PCs, print servers, routers, etc.

interface:

Select

LAN

WAN

, depending on the location of the static

route’s final destination.

When finished making your changes on this tab, click the

Apply

button and

then the

Continue

button to save these changes, or click the

Cancel

button

to undo your changes.

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