Linksys WRT54GL Router Manual PDF (Setup & Configuration Guide)

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Chapter 3

Advanced Configuration

Wireless-G Broadband Router

Wireless > Advanced Wireless Settings

This

Wireless > Advanced Wireless Settings

screen is used

to set up the Router’s advanced wireless functions. These

settings should only be adjusted by an expert administrator

as incorrect settings can reduce wireless performance.

Wireless > Advanced Wireless Settings

Advanced Wireless

Authentication Type

The default is set to

Auto

, which

allows either Open System or Shared Key authentication

to be used. With

Open System

authentication, the sender

and the recipient do NOT use a WEP key for authentication.

With

Shared Key

authentication, the sender and recipient

use a WEP key for authentication.

Basic Rate

The Basic Rate setting is not actually one rate

of transmission but a series of rates at which the Router

can transmit. The Router will advertise its Basic Rate to the

other wireless devices in your network, so they know which

rates will be used. The Router will also advertise that it will

automatically select the best rate for transmission. The

default setting is

Default

, when the Router can transmit

at all standard wireless rates (1-2Mbps, 5.5Mbps, 11Mbps,

18Mbps, and 24Mbps). Other options are

1-2Mbps

, for

use with older wireless technology, and

All

, when the

Router can transmit at all wireless rates. The Basic Rate

is not the actual rate of data transmission. If you want to

specify the Router’s rate of data transmission, configure

the Transmission Rate setting.

Transmission Rate

The rate of data transmission should

be set depending on the speed of your wireless network.

You can select from a range of transmission speeds, or you

can select

Auto

to have the Router automatically use the

fastest possible data rate and enable the Auto-Fallback

feature. Auto-Fallback will negotiate the best possible

connection speed between the Router and a wireless

client. The default value is

Auto

CTS Protection Mode

CTS (Clear-To-Send) Protection

Mode should remain disabled unless you are having severe

problems with your Wireless-G products not being able

to transmit to the Router in an environment with heavy

802.11b traffic. This function boosts the Router’s ability

to catch all Wireless-G transmissions but will severely

decrease performance.

Frame Burst

Enabling this option should provide your

network with greater performance, depending on the

manufacturer of your wireless products. To turn on the

Frame Burst option, select

Enable

. The default is

Disable

Beacon Interval

The default value is

100

. Enter a value

between 1 and 65,535 milliseconds. The Beacon Interval

value indicates the frequency interval of the beacon. A

beacon is a packet broadcast by the Router to synchronize

the wireless network.

DTIM Interval

This value, between 1 and 255, indicates

the interval of the Delivery Traffic Indication Message

(DTIM). A DTIM field is a countdown field informing

clients of the next window for listening to broadcast

and multicast messages. When the Router has buffered

broadcast or multicast messages for associated clients, it

sends the next DTIM with a DTIM Interval value. Its clients

hear the beacons and awaken to receive the broadcast

and multicast messages. The default value is

Fragmentation

Threshold

This

value

specifies

the

maximum size for a packet before data is fragmented

into multiple packets. If you experience a high packet

error rate, you may slightly increase the Fragmentation

Threshold. Setting the Fragmentation Threshold too low

may result in poor network performance. Only minor

reduction of the default value is recommended. In most

cases, it should remain at its default value of

2346

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

AP Isolation

This isolates all wireless clients and wireless

devices on your network from each other. Wireless devices

will be able to communicate with the Router but not with

each other. To use this function, select

. AP Isolation is

turned

Off

by default.

SecureEasySetup

This feature allows you to enable or

disable the SecureEasySetup feature. Select

Disabled

disable the feature and turn off the button’s light. The

feature is

Enabled

by default.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Page 17 / 41

Chapter 3

Advanced Configuration

Wireless-G Broadband Router

Security > Firewall

The

Security > Firewall

screen is used to configure a firewall

that can filter out various types of unwanted traffic on the

Router’s local network.

Security > Firewall

Firewall

Firewall Protection

To use firewall protection, keep the

default selection,

Enable

. To turn off firewall protection,

select

Disable

Block WAN Requests

Block

Anonymous

Internet

Requests

This

feature

makes it more difficult for outside users to work their

way into your network. This feature is selected

by default.

Deselect the feature to allow anonymous Internet

requests

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. This feature is selected by default. Deselect

this feature to disable it.

Filter

Internet

NAT

Redirection

This

feature

uses

port forwarding to block access to local servers from

local networked computers. Select

Filter Internet NAT

Redirection

to filter Internet NAT redirection. This feature

is not selected by default.

Filter IDENT (Port 113)

This feature keeps port 113 from

being scanned by devices outside of your local network.

This feature is selected by default. Deselect this feature to

disable it.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Security > VPN Passthrough

The

Security > VPN Passthrough

screen allows you to enable

VPN tunnels using IPSec, PPTP, or L2TP protocols to pass

through the Router’s firewall.

Security > VPN Passthrough

VPN Passthrough

IPSec Passthrough

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, keep the default,

Enable

PPTP Passthrough

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, keep the default,

Enable

L2TP Passthrough

Layer 2 Tunneling Protocol 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, keep the default,

Enable

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Page 18 / 41

Chapter 3

Advanced Configuration

Wireless-G Broadband Router

Access Restrictions > Internet Access

The

Access Restrictions > 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.

Access Restrictions > Internet Access

Internet Access

Internet Access Policy

Access can be managed by a

policy. Use the settings on this screen to establish an

access policy (after

Save Settings

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

Delete

. To view all the policies, click

Summary

(Policies can be deleted from the

Summary

screen by

selecting the policy or policies and clicking

Delete

. To

return to the Internet Access tab, click

Internet Policy Summary

Status

Policies are disabled by default. To enable a policy,

select the policy number from the drop-down menu, and

select

Enable

To create an Internet Access policy:

Select a number from the

Internet Access Policy

drop-

down menu.

To enable this policy, select

Enable

Enter a Policy Name in the field provided.

Click

Edit List of PCs

to select which PCs will be affected

by the policy. The

List of PCs

screen appears. 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

Save Settings

to apply your changes or

Cancel

Changes

to cancel your changes. Then click

List of PCs

Select

the

appropriate

option,

Deny

Allow

depending on whether you want to block or allow

Internet access for the PCs you listed on the

List of PCs

screen.

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

Select any Blocked Services or Website Blocking you

wish to use.

Click

Save Settings

to save the policy’s settings, or

click

Cancel Changes

to cancel the policy’s settings.

Blocked Services

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

. (You can

block up to 20 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

Add/Edit Service

. Then

the

Port Services

screen will appear.

Port Services

Page 19 / 41

Chapter 3

Advanced Configuration

Wireless-G Broadband Router

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

Add

To modify a service, select it from the list on the right.

Change its name, protocol setting, or port range. Then

click

Modify

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

click

Delete

When you are finished making changes on the

Port

Services

screen, click

Apply

to save the changes. If you

want to cancel your changes, click

Cancel

. To close the

Port Services

screen and return to the

Access Restrictions

screen, click

Website Blocking by URL Address

If you want to block websites with specific URL addresses,

enter each URL in a separate field next to

Website Blocking

by URL Address

Website Blocking by Keyword

If you want to block websites using specific keywords,

enter each keyword in a separate field next to

Website

Blocking by Keyword

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Applications and Gaming > Port Range

Forward

The

Applications & Gaming > Port Range Forward

screen

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.)

Applications and Gaming > Port Range Forward

Port Range Forward

To forward a port, enter the information on each line for

the criteria required.

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 in the Start column and the number

that ends the range in the End column.

Protocol

Select the protocol used for this application,

either

TCP

UDP

, or

Both

IP Address

For each application, enter the IP Address of

the PC running the specific application.

Enable

Select

Enable

to enable port forwarding for the

relevant application.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Applications & Gaming > Port Triggering

The

Applications & Gaming > Port Triggering

screen allows

the Router to watch outgoing data for specific port

numbers. The IP address of the computer 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.

Applications and Gaming > Port Triggering

Port Triggering

Application

Enter the application name of the trigger.

Triggered Range

For each application, list the triggered port number range.

Check with the Internet application documentation for

the port number(s) needed.

Page 20 / 41

Chapter 3

Advanced Configuration

Wireless-G Broadband Router

Start Port

Enter the starting port number of the Triggered

Range.

End Port

Enter the ending port number of the Triggered

Range.

Forwarded Range

For each application, list the forwarded port number

range. Check with the Internet application documentation

for the port number(s) needed.

Start Port

Enter the starting port number of the

Forwarded Range.

End Port

Enter the ending port number of the Forwarded

Range.

Enable

Select

Enable

to enable port triggering for the

applicable application.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Applications and Gaming > DMZ

The DMZ feature allows one network computer to be

exposed to the Internet for use of a special-purpose

service such as Internet gaming or videoconferencing.

DMZ hosting forwards all the ports at the same time to

one PC. The Port Range Forward feature is more secure

because it only opens the ports you want to have opened,

while DMZ hosting opens all the ports of one computer,

exposing the computer to the Internet.

Applications and Gaming > DMZ

DMZ

Any PC whose port is being forwarded must have its DHCP

client function disabled and should have a new static IP

address assigned to it because its IP address may change

when using the DHCP function.

To expose one PC, select

Enable

. Then, enter the

computer’s IP address in the

DMZ Host IP Address

field. This

feature is disabled by default.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to cancel your changes.

Applications and Gaming > QoS

Quality of Service (QoS) ensures better service to

high-priority

types

network

traffic,

which

may

involve

demanding,

real-time

applications,

such

videoconferencing.

There are three types of QoS available: Device Priority,

Ethernet Port Priority, and Application Priority.

Wired QoS

Enable/Disable

To enable QoS, select

Enable

. Otherwise,

select

Disable

. QoS is disabled by default.

Upstream Bandwidth

Select

Auto

Manual

from

the drop-down menu. Manual allows you to specify the

maximum outgoing bandwidth that applications can

utilize.

Applications and Gaming > QoS

Device Priority

Enter the name of your network device in the

Device name

field, enter its MAC Address, and then select its priority

from the drop-down menu.

Ethernet Port Priority

Ethernet Port Priority QoS allows you to prioritize

performance for the Router’s four ports, LAN Ports 1-4.

For

each port, select

the priority and flow control setting.

Rate

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