Linksys WRT54GC Router Manual PDF (Setup & Configuration Guide)

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Chapter 5: Configuring the Compact Wireless-G Broadband Router

The Wireless Tab - Wireless MAC Filter

Compact Wireless-G Broadband Router

The Wireless Tab - Wireless MAC Filter

Wireless access can be filtered by using the MAC addresses of the wireless devices transmitting within your

network’s radius.

Wireless MAC Filter

Access Restrictions

To filter wireless users by MAC Address, either permitting or blocking access, click

Enabled

. If you do not wish to

filter users by MAC Address, select

Disabled

Prevent PCs listed below from accessing the wireless network

. Clicking this radio button will block wireless

access by MAC Address.

Permit PCs listed below to access the wireless network

. Clicking this radio button will allow wireless access

by MAC Address.

Wireless Client List

. Click the

Wireless Client MAC List

button to display a list of network users by MAC

Address.From the

To Sort by

drop-down menu, you can sort the table by Client Name, IP Address, or MAC

Address. To view the most up-to-date information, click the

Refresh

button. To exit this screen, click the

button.

List users, by MAC Address, whose wireless access you want to control.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes. Help information is shown on the right-hand side of the screen.

Figure 5-19: Wireless Tab - Wireless MAC Filter

Figure 5-20: Wireless Tab - Wireless Client List

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Chapter 5: Configuring the Compact Wireless-G Broadband Router

The Wireless Tab - Advanced Wireless Settings

Compact Wireless-G 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.

Advanced Wireless

Wireless-G Settings

Authentication Type

. The default is set to

Auto (Default)

, 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.

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 (Default)

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

(Default)

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.

CTS Protection Mode

. CTS (Clear-To-Send) Protection Mode should be set to

Auto

(Default)

. The Router will

automatically use CTS Protection Mode when your Wireless-G products are experiencing severe problems and

are not 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.

DTIM Interval

. This value 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

Figure 5-21: Wireless Tab - Advanced Wireless

Settings

cts

(clear to send): a signal sent by a wireless

device, signifying that it is ready to receive data.

dtim

: a message included in data packets

that can increase wireless efficiency.

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Chapter 5: Configuring the Compact Wireless-G Broadband Router

The Wireless Tab - Advanced Wireless Settings

Compact Wireless-G Broadband Router

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

2347

Beacon Interval

. The default value is

100

. 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.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes. Help information is shown on the right-hand side of the screen.

beacon interval

: data transmitted on your wireless

network that keeps the network synchronized.

fragmentation

: breaking a packet into smaller units

when transmitting over a network medium that

cannot support the original size of the packet.

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Chapter 5: Configuring the Compact Wireless-G Broadband Router

The Security Tab - Firewall

Compact Wireless-G Broadband Router

The Security Tab - Firewall

The

Firewall

screen offers Filters and the option to Block WAN Requests. Filters block specific Internet data types

and block anonymous Internet requests. To enable a feature, select

Enabled

from the drop-down menu. To

disable a feature, select

Disabled

from the drop-down menu.

Firewall

•

SPI Firewall Protection. Enable this feature to employ Stateful Packet Inspection (SPI) for more detailed

review of data packets entering your network environment.

•

Block Anonymous Internet Requests. When enabled, this feature keeps your network from being “pinged,” or

detected, by other Internet users. It also reinforces your network security by hiding your network ports. Both

functions of this feature make it more difficult for outside users to work their way into your network. This

feature is enabled by default. Select

Disabled

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. Select Enable to filter multicasting, or Disable to disable this feature.

•

Filter Internet NAT Redirection. This feature uses port forwarding to block access to local servers from local

networked computers. Check the box to enable filter Internet NAT redirection, or uncheck the box to disable

this feature.

•

Web Filters

Proxy. Use of WAN proxy servers may compromise the Gateway's security. Denying Filter Proxy will disable

access to any WAN proxy servers. To enable proxy filtering, click the checkbox.

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. To enable Java filtering, click the checkbox.

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. To enable ActiveX filtering, click the

checkbox.

Cookies. A cookie is data stored on your computer and used by Internet sites when you interact with them. To

enable cookie filtering, click the checkbox.

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes. Help information is shown on the right-hand side of the screen.

Figure 5-22: Security Tab - Firewall

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Chapter 5: Configuring the Compact Wireless-G Broadband Router

The Security Tab - VPN Passthrough

Compact Wireless-G Broadband Router

The Security Tab - VPN Passthrough

Use the settings on this tab to allow VPN tunnels using IPSec, L2TP, or PPTP protocols to pass through the

Router’s firewall.

VPN Passthrough

IPSec Passthrough

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

of packets at the IP layer.

IPSec Pass-Through is enabled by default. To disable IPSec Passthrough, select

Disabled

L2TP Passthrough

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

Internet on the Layer 2 level. L2TP Pass-Through is enabled by default. To disable L2TP Passthrough, select

Disabled

PPTP Passthrough

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

tunneled through an IP network. PPTP Pass-Through is enabled by default. To disable PPTP Passthrough, select

Disabled

Change these settings as described here and click the

Save Settings

button to apply your changes or

Cancel

Changes

to cancel your changes. Help information is shown on the right-hand side of the screen.

The Access Restrictions Tab - Internet Access Policy

The

Internet Access Policy

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

Internet access, designated applications, websites, and inbound traffic during specific days and times.

Internet Access Policy

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 This Policy

button. To view all the

policies, click the

Summary

button.

On the

Summary

screen, the policies are listed with the following information: No., Policy Name, Access, Days,

Time, and status (Enabled). You can change the type of access, days, and times of a policy. To activate a policy,

click the

Enabled

checkbox. To delete a policy, click its

Delete

button. Click the

Save Settings

button to save

your changes, or click the

Cancel Changes

button to cancel your changes. To return to the Internet Access Policy

tab, click the

button. To view the list of PCs for a specific policy, click the

PCs List

button.

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.

Figure 5-23: Security Tab - VPN Passthrough

Figure 5-24: Access Restrictions Tab - Internet

Access Policy

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