Linksys WRT54GX4 Router Manual PDF (Setup & Configuration Guide)

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25

Chapter 5: Configuring the Wireless-G Broadband Router

The Wireless Tab - Advanced Wireless Settings

Wireless-G Broadband Router with SRX400

RTS Threshold

. Should you encounter inconsistent data flow, only minor reduction of the default value,

2347

, is

recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will

not be enabled. The Router sends Request to Send (RTS) frames to a particular receiving station and negotiates

the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS)

frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value

of

2347

.

Preamble Type

. The preamble defines the length of the CRC block for communication between the Router and

the roaming Network Card. (High network traffic areas should use the shorter preamble type.) Select the

appropriate preamble type,

Long

(default) or

Short

.

Network Density

. This setting is a reflection of the Router’s range. Setting the density to

Low

provides you with

a greater range. Setting the density to

High

gives you a lower range. The default setting is

Low

.

Compression

. This feature provides real-time hardware data compression, so pre-compressed frames are used,

with no impact on the Router’s processor. Data throughput is thereby increased. To use compression, select

Enable

. The default setting is

Disable

.

Concatenation

. This feature allows data from several packets to be merged into one. Overhead is removed, so

data throughput is increased, particularly at higher data transmission rates. If you do not want to use

concatenation, select

Disable

. The default setting is

Enable

.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes.

rts

(request to send): a networking method of coordinating

large packets through the RTS Threshold setting.

Page 32 / 87

26

Chapter 5: Configuring the Wireless-G Broadband Router

The Security Tab - Firewall

Wireless-G Broadband Router with SRX400

The Security Tab - Firewall

Use this screen to configure the firewall and VPN pass through settings.

Firewall

Firewall Protection

. Enable this feature to employ Stateful Packet Inspection (SPI) for more detailed review of

data packets entering your network environment.

Block WAN Request

Block WAN Ping

. Enable the Block WAN Ping feature by checking the box beside

Block WAN Ping

and you can

prevent your network from being “pinged,” or detected, by other Internet users. The Block WAN Ping feature also

reinforces your network security by hiding your network ports. Both functions of the Block WAN Ping feature

make it more difficult for outside users to work their way into your network. This feature is enabled by default.

VPN Pass Through

These settings allow VPN tunnels using PPTP, IPSec, or L2TP protocols to pass through the Router’s firewall.

PPTP Pass through

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

tunneled through an IP network. To allow PPTP tunnels to pass through the Router, click

Enable

.

IPSec Pass through

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

exchange of packets at the IP layer. To allow IPSec tunnels to pass through the Router, click

Enable

.

L2TP Pass through

. Layer 2 Tunneling Protocol (L2TP) is the method used to enable Point-to-Point sessions via

the Internet on the Layer 2 level. To allow L2TP tunnels to pass through the Router, click

Enable

.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes.

Figure 5-24: Security Tab - Firewall

firewall

: a set of related programs located at a

network gateway server that protects the resources

of a network from users from other networks.

Page 33 / 87

27

Chapter 5: Configuring the Wireless-G Broadband Router

The Access Restrictions Tab - Internet Access

Wireless-G Broadband Router with SRX400

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, websites, and inbound traffic 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. (Policies can be deleted from the

Summary

screen by selecting the

policy or policies and clicking the

Delete

button. To return to the Internet Access tab, click the

Close

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

.

You can create a policy to manage Internet access.

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.

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. Then click the

Close

button.

Figure 5-25: Access Restrictions Tab - Internet Access

Figure 5-26: Internet Policy Summary

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28

Chapter 5: Configuring the Wireless-G Broadband Router

The Access Restrictions Tab - Internet Access

Wireless-G Broadband Router with SRX400

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 (shown in Figure 5-26).

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.

You can filter access to various services accessed over the Internet, such as FTP or telnet, by selecting

services from the drop-down menus next to

Blocked Services

. Then enter the range of ports you want to filter.

If the service you want to block is not listed or you want to edit a service’s settings, then click the

Add/Edit

Service

button. Then the

Port Services

screen will appear.

To 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.

To modify a service, select it from the list on the right. Change its name, protocol setting, or port range. Then

click the

Modify

button.

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

Delete

button.

When you are finished making changes on the

Port Services

screen, click the

Apply

button to save changes.

If you want to cancel your changes, click the

Cancel

button. To close the

Port Services

screen and return to

the

Access Restrictions

screen, click the

Close

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.

Figure 5-28: Port Services

ftp

: a protocol used to transfer files over a TCP/IP network

telnet

: a user command and TCP/IP

protocol used for accessing remote PCs

url

: the address of a file located on the Internet

Figure 5-27: List of PCs

Page 35 / 87

29

Chapter 5: Configuring the Wireless-G Broadband Router

The Applications and Gaming Tab - Port Range Forward

Wireless-G Broadband Router with SRX400

The Applications and Gaming Tab - Port Range Forward

The Applications and Gaming Tab allows you to set 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.)

Port Range Forward

To forward a port, enter the necessary information.

Port Range

Application

. In this field, enter the name you wish to give the application. Each name can be up to 12 characters.

Start/End

. This is the port range. Enter the number that starts the port range under

Start

and the number that

ends the range under

End

.

Protocol

. Enter the protocol used for this application, either

TCP

or

UDP

, or

Both

.

IP Address

. For each application, enter the IP Address of the PC running the specific application.

Enable

. Click the

Enable

checkbox to enable port forwarding for the relevant application.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes.

Figure 5-29: Applications and Gaming Tab - Port Range

Forward

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