Linksys BEFW11S4v4-1.52 Router Manual PDF (Setup & Configuration Guide)

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Chapter 5: Configuring the Wireless-B Broadband Router

The Wireless Tab - Advanced Wireless Settings

Wireless-B Broadband Router

The Wireless Tab - Advanced Wireless Settings

This tab 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.

Basic Rate. The Basic Rate setting is not actually one rate of transmission but a series of rates, advertising to the

other wireless points in your network at what rates the Router can transmit. At the default setting, the Router will

advertise that it will

Automatically select the best rate

for transmission. Other options of rates to advertise are

1-2Mbps

, for use with older wireless technology, and

All

, when you wish to make all rates advertised. The Basic

Rate is not the rate transmitted; that is the Transmission Rate.

Control Tx Rates. The default transmission rate is Auto. The range is from 1 to 54Mbps. 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 keep the default setting,

Auto

, to have the Gateway automatically use the fastest

possible data rate and enable the Auto-Fallback feature. Auto-Fallback will negotiate the best possible

connection speed between the Gateway and a wireless client.

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 Preamble(default)

Short Preamble

Authentication Type. The default is set to

Auto (default)

, 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.

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 16384, 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

Figure 5-20: Wireless Tab - Advanced Wireless Settings

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Chapter 5: Configuring the Wireless-B Broadband Router

The Wireless Tab - Advanced Wireless Settings

Wireless-B Broadband Router

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

2346

, 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 2346.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes.

The Security Tab - Filter

Filters block specific internal users from accessing the Internet. From the Filters tab, you can set up a filter

through an IP address or a network port number.

Filter IP Address Range. To set up a filter using IP addresses, enter the range of IP addresses you wish to filter in

the IP address fields. Users who have filtered IP addresses will not be able to access the Internet at all. If you only

want to filter one IP address instead of a range of IP addresses, enter the same value into both fields. For

instance, if you wish to filter the PC with the IP address of 192.168.1.5, enter 5 into both fields on one line:

192.168.1.5 ~ 192.168.1.5.

Filter Port Range. To filter users by network port number, select a protocol, then enter a network port number or a

range of network ports.

Enter the port numbers you want to filter in the port numbers fields.

Users connected to

the Router will no longer be able to access any port number listed there.

Filter MAC Address. This feature filters the Ethernet adapter’s specific MAC address from going out to the

Internet. To check your Ethernet adapter’s MAC address, you can run winipcfg or ipconfig in the command

prompt, depending on which Windows operating system you are using.

To set the MAC filter, click the

Edit MAC

Filter Setting

button.

When the screen appears, select the range in the drop-down menu, and in a MAC number

field, enter the 12-digit MAC address you want to filter. Click Apply to save the changes, or Undo to undo the

changes. For information on obtaining a MAC address, go to Appendix E: Finding the MAC Address and IP Address

for Your Ethernet Adapter.

Block WAN Requests. Enable the Block WAN Request feature by checking the radio button beside

Block

Anonymous Internet Requests

and you can prevent your network from being “pinged,” or detected, by other

Internet users. Click Disabled it you want to allow anonymous Internet requests.The Block WAN Request feature

also reinforces your network security by hiding your network ports. Both functions of the Block WAN Request

Figure 5-21: Security Tab - Filter

Figure 5-22: Security Tab - MAC Filter

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Chapter 5: Configuring the Wireless-B Broadband Router

The Security Tab - VPN Passthrough

Wireless-B Broadband Router

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

default.

Filter Multicast. This feature allows for multiple transmissions to specific recipients at the same time.

Select

Enabled

to support the feature, or

Disabled

to keep the Router from multicasting.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes.

The Security Tab - VPN Passthrough

Use the settings on this tab to allow VPN tunnels in either IPSec or PPTP protocols to pass through the Router’s

firewall.

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, click the radio button beside

Enabled

. IPSec Passthrough is enabled by default. Click

Disabled

to disable the function.

PPPoE Passthrough. Point-to-Point Protocol over Ethernet allows your PC(s) to use the PPPoE client software

provided by your ISP. Some ISPs may request that you use this feature.To allow allow PPPoE Passthrough, click

the radio button beside

Enabled

. PPTP Passthrough is enabled by default. Click

Disabled

to disable the function.

PPTP Passthrough. Point-to-Point Tunneling Protocol is the method used to enable VPN sessions to a Windows

NT 4.0 or 2000 server. To allow PPTP tunnels to pass through the Router, click the radio button beside

Enabled

PPTP Passthrough is enabled by default. Click

Disabled

to disable the function.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes.

Figure 5-23: Security Tab - VPN Passthrough

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Chapter 5: Configuring the Wireless-B Broadband Router

The Applications and Gaming Tab - Port Range Forwarding

Wireless-B Broadband Router

The Applications and Gaming Tab - Port Range Forwarding

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.)

To forward a port, enter the information on each line for the criteria required. Descriptions of each criteria are

described here.

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

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 5-24: Applications and Gaming Tab - Port Range

Forwarding

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Chapter 5: Configuring the Wireless-B Broadband Router

The Applications and Gaming Tab - Port Triggering

Wireless-B Broadband Router

The Applications and Gaming Tab - Port Triggering

Port Triggering

Port Triggering is used for special applications that can request a port to be opened on demand. For this feature,

the Gateway will watch outgoing data for specific port numbers. The Gateway will remember the IP address of the

computer that sends a transmission requesting data, so that when the requested data returns through the

Gateway, the data is pulled back to the proper computer by way of IP address and port mapping rules.

•

Application. Enter the name you wish to give each application.

•

Start Port and End Port. Enter the starting and ending Triggered Range numbers and the Forwarded Range

numbers of the port you wish to forward.

When finished making your changes on this tab, click the

Save Settings

button to save these changes, or click

the

Cancel Changes

button to undo your changes.

The Applications and Gaming Tab - UPnP Forwarding

UPnP Forwarding

The UPnP Forwarding screen provides options for customization of port services for common applications.

When users send this type of request to your network via the Internet, the Gateway will forward those requests to

the appropriate computer. Any computer whose port is being forwarded should 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.

Choose or enter the Application in the field. Then, enter the External and Internal Port numbers in the fields.

Select the type of protocol you wish to use for each application:

TCP

UDP

. Enter the IP Address in the field.

Click

Enabled

to enable UPnP Forwarding for the chosen application.

When finished making your changes on this tab, click the

Save Settings

button to save these changes, or click

the

Cancel Changes

button to undo your changes.

Figure 5-26: Applications and Gaming - UPnP Forwarding

Figure 5-25: Applications and Gaming - Port Triggering

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