Linksys WRT54GP2A-AT Router Manual PDF (Setup & Configuration Guide)

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Chapter 5: Configuring the Router

The Security Tab - Firewall

Broadband Router with 2 Phone Ports

The Security Tab - Firewall

When you click the Security tab, you will see the

Firewall

screen. The Router’s firewall enhances the security of

your network. You can also enable a variety of filters to further protect your network and block anonymous

Internet requests.

Firewall

The firewall uses Stateful Packet Inspection (SPI) to check the incoming data transmissions before allowing them

to enter your network. To enhance the security of your network, this feature is enabled by default and cannot be

disabled.

Additional Filters

Filter Proxy

. Use of WAN proxy servers may compromise the Router’s security. If you deny proxy, you will block

access to any WAN proxy servers. Click the checkbox to enable proxy filtering.

Filter Cookies

. A cookie is data stored on your PC and used by Internet sites when you interact with them. Click

the checkbox to enable cookie filtering.

Filter Java Applets

. Java is a programming language for websites. If you deny Java Applets, you run the risk of

not having access to Internet sites created using this programming language. Click the checkbox to enable Java

Applet filtering.

Filter ActiveX

. ActiveX is a programming language for websites. If you deny ActiveX, you run the risk of not

having access to Internet sites created using this programming language. Click the checkbox to enable ActiveX

filtering.

Filter Multicast

. Multicasting allows for multiple transmissions to specific recipients at the same time. If

multicasting is permitted, then the Router will allow IP multicast packets to be forwarded to the appropriate

computers. Click the checkbox to enable multicast filtering.

Block WAN Requests

Block Anonymous Internet Requests

. This keeps your network from being “pinged” or detected and reinforces

your network security by hiding your network ports, so it is more difficult for intruders to work their way into your

network. Click the checkbox to block anonymous Internet requests. This feature is enabled by default.

When you have finished making changes to this screen, click the

Save Settings

button to save the changes, or

click the

Cancel Changes

button to undo your changes. For help information, click

Help

.

Figure 5-19: Security Tab - Firewall

spi

(stateful packet inspection)

firewall:

A

technology that inspects incoming packets of

information before allowing them to enter the

network

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26

Chapter 5: Configuring the Router

The Security Tab - VPN

Broadband Router with 2 Phone Ports

The Security Tab - VPN

The

VPN

screen allows you to allow VPN tunnels using IPSec, PPTP, or L2TP protocols to pass through the Router.

VPN Passthrough

IPSec Passthrough

. IPSec (Internet Protocol Security) is a suite of protocols used to implement secure exchange

of packets at the IP layer. To allow IPSec Passthrough, click the

Enable

button. To disable IPSec Passthrough,

click the

Disable

button.

PPTP Passthrough

. PPTP (Point-to-Point Tunneling Protocol) Passthrough allows the Point-to-Point (PPP) to be

tunneled through an IP network. To allow PPTP Passthrough, click the

Enable

button. To disable PPTP

Passthrough, click the

Disable

button.

L2TP Passthrough

. Layer 2 Tunneling Protocol Passthrough is the method used to enable Point-to-Point (PPP)

sessions via the Internet on the Layer 2 level. To allow L2TP Passthrough, click the

Enable

button. To disable

L2TP Passthrough, click the

Disable

button.

When you have finished making changes to this screen, click the

Save Settings

button to save the changes, or

click the

Cancel Changes

button to undo your changes. For help information, click

Help

.

Figure 5-20: Security Tab - VPN

ipsec

: a VPN protocol used to implement

secure exchange of packets at the IP layer

pptp

: a VPN protocol that allows the Point to Point

Protocol (PPP) to be tunneled through an IP network.

This protocol is also used as a type of broadband

connection in Europe

vpn

: a security measure to protect data as it leaves

one network and goes to another over the Internet

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27

Chapter 5: Configuring the Router

The Access Restrictions Tab - Internet Access

Broadband Router with 2 Phone Ports

The Access Restrictions Tab - Internet Access

The

Internet Access

screen allows you to block or allow specific kinds of Internet usage and traffic, such as

Internet access, designated services, and websites during specific days and times.

Internet Access

Internet Access Policy

. Access can be managed by a policy. Use the settings on this screen to establish an

access policy (after the

Save Settings

button is clicked). Selecting a policy from the drop-down menu will

display that policy’s settings. To delete a policy, select that policy’s number and click the

Delete

button. To view

all the policies, click the

Summary

button.

Status

. Policies are disabled by default. To enable a policy, select the policy number from the drop-down menu,

and click the radio button beside

Enable

. To disable a policy, select the policy number from the drop-down menu,

and click the radio button beside

Disable

.

To create an Internet Access Policy:

1.

Select a number from the

Internet Access Policy

drop-down menu.

2.

To enable this policy, click the radio button beside

Enable

.

3.

Enter a Policy Name in the field provided.

Figure 5-21: Access Restrictions Tab - Internet Access

NOTE:

If you have an AT&T CallVantage Service account, contact AT&T technical support at

1-866-596-8464 before you enable an Internet Access Policy.

Figure 5-22: Internet Policy Summary

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28

Chapter 5: Configuring the Router

The Access Restrictions Tab - Internet Access

Broadband Router with 2 Phone Ports

4.

Click the

Edit List of PCs

button to select which PCs will be affected by the policy. The

List of PCs

screen will

appear. You can select a PC by MAC Address or IP Address. You can also enter a range of IP Addresses if you

want this policy to affect a group of PCs. After making your changes, click the

Save Settings

button to apply

your changes or

Cancel Changes

to cancel your changes. Click the

Close

button to return to the

Internet

Access

screen.

5.

Click the appropriate option,

Deny

or

Allow

, depending on whether you want to block or allow Internet access

for the PCs you listed on the

List of PCs

screen.

6.

Decide which days and what times you want this policy to be enforced. Select the individual days during

which the policy will be in effect, or select

Everyday

. Then enter a range of hours and minutes during which

the policy will be in effect, or select

24 Hours

.

7.

In the

Blocked Services

section, you can filter access to various services accessed over the Internet, such as

FTP or telnet. Select the service from the drop-down menu listing your choice of services. Then click the

>>

button to add the service to the

Blocked services

list. (You can block up to two services per policy.)

If you want to remove a service from the

Blocked services

list, then select it and click the

<<

button.

If the service you want is not available, then you can add a service. Enter the service’s name in the

Service

Name

field. Select its protocol from the

Protocol

drop-down menu, and enter its range in the

Port Range

fields. Then click the

Add

button.

If you want to edit a service’s settings, then select the service in the drop-down menu on the left. Change its

name, protocol setting, or port range. Then click the

Modify

button.

To delete a service, select it from the list on the left. Then click the

Delete

button.

8.

If you want to block websites with specific URL addresses, enter each URL in a separate field next to

Website

Blocking by URL Address

.

9.

If you want to block websites using specific keywords, enter each keyword in a separate field next to

Website

Blocking by Keyword

.

10. Click the

Save Settings

button to save the policy’s settings. To cancel the policy’s settings, click the

Cancel

Changes

button.

11. Repeat steps 1-10 to create more policies.

When you have finished making changes to this screen, click the

Save Settings

button to save the changes, or

click the

Cancel Changes

button to undo your changes. For help information, click

Help

.

Figure 5-23: List of PCs

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29

Chapter 5: Configuring the Router

The Applications & Gaming Tab - Port Range Forward

Broadband Router with 2 Phone Ports

The Applications & Gaming Tab - Port Range Forward

When you click the Applications & Gaming tab, you will see the

Port Range Forward

screen. 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, you should assign a static IP address to the designated PC.

If you need to forward all ports to one PC, click the

DMZ

tab.

Port Range Forward

Port Range

To add a server using Port Range Forwarding, complete the following fields:

Application

. Enter the name of the application.

Start and End

. Enter the number or range of external port(s) used by the server or Internet application. Check

with the Internet application software documentation for more information.

Protocol

. Select the protocol

TCP

or

UDP

, or select

Both

.

IP Address

. 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 D: Finding the MAC Address and IP Address for Your Ethernet Adapter.”

Enable

. Check the

Enable

box to enable the application you have defined. Port Range Forwarding for a specific

application will not function if its Enable button is left unchecked. This is disabled (unchecked) by default.

When you have finished making changes to this screen, click the

Save Settings

button to save the changes, or

click the

Cancel Changes

button to undo your changes. For help information, click

Help

.

Figure 5-24: Applications & Gaming Tab -

Port Range Forward

ip

(internet protocol): a protocol

used to send data over a network

ip address

: the address used to identify

a computer or device on a network

tcp

: a network protocol for transmitting data that

requires acknowledgement from the recipient of

data sent

udp

: a network protocol for transmitting data

that does not require acknowledgement from

the recipient of the data that is sent.

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