Linksys WRT54GH Router Manual PDF (Setup & Configuration Guide)

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Chapter 3

Advanced Configuration

Wireless-G Home Router with SpeedBurst

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. Select

Shared Key

to only use Shared Key

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 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.) 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 (1-2 Mbps, 5.5 Mbps,

11 Mbps, 18 Mbps, and 24Mbps). Select

1-2 Mbps

for

use with older wireless technology. Select

All

, when the

Router can transmit at all wireless rates.

Transmission Rate

The Transmission setting is available

if the Network Mode is Mixed, Wireless-G Only, or

Wireless-B Only. The rate of data transmission should be

set depending on the speed of your wireless network.

Select from a range of transmission speeds, or keep the

default,

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.

CTS Protection Mode

The Router automatically uses CTS

(Clear-To-Send) Protection Mode when your Wireless-G

devices are experiencing severe problems and are not able

to transmit to the Router in an environment with heavy

802.11b traffic. This option boosts the Router’s ability to

catch all Wireless-G transmissions but severely decreases

performance. To use this option, keep the default,

Auto

To disable this option, select

Disabled

Beacon Interval

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. The default is

100

milliseconds.

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

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to clear your changes.

Security > Firewall

The

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

SPI Firewall Protection

To use firewall protection,

keep the default selection,

Enabled

. To turn off firewall

protection, select

Disabled

Internet Filter

For the following options, select the option to enable it, or

deselect the option to disable it.

Filter Anonymous Internet Requests

This feature makes

it more difficult for outside users to work their way into

your network. This feature is enabled

by default. Deselect

this option to allow anonymous Internet requests

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Chapter 3

Advanced Configuration

Wireless-G Home Router with SpeedBurst

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. Select this option to filter multicasting. This

option is disabled by default.

Filter Internet NAT Redirection

This feature uses port

forwarding to block access to local servers from local

networked computers. Select this option to filter Internet

NAT redirection. This option is disabled by default.

Filter IDENT (Port 113)

This feature keeps port 113 from

being scanned by devices outside of your local network.

This feature is enabled by default. Deselect this option to

disable it.

Web Filter

For the following options, select the option to enable it, or

deselect the option to disable it.

Proxy

Use of WAN proxy servers may compromise the

Gateway’s security. Denying Proxy will disable access to

any WAN proxy servers. Select this option to enable proxy

filtering. This option is disabled by default.

Java

Java is a programming language for websites. If you

deny Java, you run the risk of not having access to Internet

sites created using this programming language. Select

this option to enable Java filtering. This option is disabled

by default.

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.

Select this option to enable ActiveX filtering. This option

is disabled by default.

A cookie is data stored on your computer and

used by Internet sites when you interact with them. Select

this option to filter cookies. This option is disabled by

default.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to clear your changes.

Security > VPN Passthrough

The

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,

Enabled

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,

Enabled

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,

Enabled

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to clear your changes.

Page 18 / 50

Chapter 3

Advanced Configuration

Wireless-G Home Router with SpeedBurst

Access Restrictions > 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.

Access Restrictions > Internet Access

Internet Access Policy

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

This Entry

. To view all the policies, click

Summary

The policies are listed with the following information: No.,

Policy Name, Days, and Time of Day. To delete a policy,

select the policy’s

Delete

option, and then click

Delete

To return to the

Internet Access Policy

screen, click

Summary

Status

Policies are disabled by default. To enable a policy,

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

select

Enabled

To create a policy, follow steps 1-11. Repeat these steps to

create additional policies, one at a time.

1. Select a number from the

Access Policy

drop-down

menu.

Enter a Policy Name in the field provided.

To enable this policy, select

Enabled

4. Click

Edit List

to select which computers will be

affected by the policy. The

Internet Access PC List

screen

appears. You can select a computer 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 computers.

After making your changes, click

Save Settings

apply your changes, or click

Cancel Changes

to clear

your changes. Then click

Internet Access PC List

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Chapter 3

Advanced Configuration

Wireless-G Home Router with SpeedBurst

5. Select

the

appropriate

option,

Deny

Allow

depending on whether you want to block or allow

Internet access for the computers you listed on the

Internet Access PC List

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

7. You can block websites with specific URL addresses.

Enter each URL in a separate

Website Blocking by URL

Address

field.

You can also block websites using specific keywords.

Enter each keyword in a separate

Website Blocking by

Keyword

field.

9. You can filter access to various services accessed

over the Internet, such as FTP or telnet. (You

can block up to three applications per policy.)

From the Applications list, select the application you

want to block. Then click the

button to move it to

the Blocked List. To remove an application from the

Blocked List, select it and click the

button.

10. If the application you want to block is not listed or you

want to edit a service’s settings, enter the application’s

name in the

Application Name

field. Enter its range

in the

Port Range

fields. Select its protocol from the

Protocol

drop-down menu. Then click

Add

To modify a service, select it from the Application list.

Change its name, port range, and/or protocol setting.

Then click

Modify

To delete a service, select it from the Application list.

Then click

Delete

11. Click

Save Settings

to save the policy’s settings, or

click

Cancel Changes

to clear the changes.

Applications and Gaming > Single Port

Forwarding

The

Single Port Forwarding

screen allows you to customize

port services for common applications on this screen.

When users send these types of requests to your network via

the Internet, the Router will forward those requests to the

appropriate servers (computers). Before using forwarding,

you should assign static IP addresses to the designated

servers (use the DHCP Reservation feature on the

Basic Setup

screen; refer to

DHCP Reservation

page 7

Applications and Gaming > Single Port Forwarding

Single Port Forwarding

Common applications are available for the first five

entries. Select the appropriate application. Then enter the

IP address of the server that should receive these requests.

Select

Enabled

to activate this entry.

For additional applications, complete the following fields:

Application Name

Enter the name you wish to give the

application. Each name can be up to 12 characters.

External Port

Enter the external port number used by

the server or Internet application. Check with the Internet

application documentation for more information.

Internal Port

Enter the internal port number used by

the server or Internet application. Check with the Internet

application documentation for more information.

Protocol

Select the protocol(s) used for this application,

TCP

UDP

, or

Both

To IP Address

For each application, enter the IP address

of the computer that should receive the requests. If you

assigned a static IP address to the computer, then you

can look up its IP address; click

DHCP Reservation

on the

Basic Setup

screen (r

efer to

DHCP Reservation

page 7

Enabled

For each application, select

Enabled

to enable

port forwarding.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to clear your changes.

Page 20 / 50

Chapter 3

Advanced Configuration

Wireless-G Home Router with SpeedBurst

Applications and Gaming > Port Range

Forwarding

The

Port Range Forwarding

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.)

When users send these types of requests to your network via

the Internet, the Router will forward those requests to the

appropriate servers (computers). Before using forwarding,

you should assign static IP addresses to the designated

servers (use the DHCP Reservation feature on the

Basic Setup

screen; refer to

DHCP Reservation

page 7

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

DMZ

tab.

Applications and Gaming > Port Range Forwarding

Port Range Forwarding

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

the criteria required.

Application Name

In this field, enter the name you

wish to give the application. Each name can be up to 12

characters.

Start~End Port

Enter the number or range of port(s)

used by the server or Internet applications. Check with the

Internet application documentation for more information.

Protocol

Select the protocol(s) used for this application,

TCP

UDP

, or

Both

To IP Address

For each application, enter the IP address

of the computer that should receive the requests. If you

assigned a static IP address to the computer, then you

can look up its IP address; click

DHCP Reservation

on the

Basic Setup

screen (r

efer to

DHCP Reservation

page 7

Enabled

Select

Enabled

to enable port forwarding for

the applications you have defined.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to clear your changes.

Applications & Gaming > Port Range

Triggering

The

Port Range 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 Range Triggering

Port Range Triggering

Application Name

Enter the application name of the

trigger.

Triggered Range

For each application, enter the starting

and ending port numbers of the triggered port number

range. Check with the Internet application documentation

for the port number(s) needed.

Forwarded

Range

For

each

application,

enter

the

starting and ending port numbers of the forwarded

port number range. Check with the Internet application

documentation for the port number(s) needed.

Enabled

Select

Enabled

to enable port triggering for the

applications you have defined.

Click

Save Settings

to apply your changes, or click

Cancel

Changes

to clear your changes.

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