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Page 26 / 75 Scroll up to view Page 21 - 25
20
Chapter 5: Configuring the Wireless-G Broadband Router
The Wireless Tab - Wireless Security
Wireless-G Broadband Router with SRX
WEP
. WEP is a basic encryption method, which is not as secure as WPA. To use WEP, select a Default Transmit Key
(choose which Key to use), and a level of WEP encryption,
64 bits 10 hex digits
or
128 bits 26 hex digits
. Then
either generate a WEP key using the Passphrase or enter the WEP key manually.
Change these settings as described here and click the
Save Settings
button to apply your changes or
Cancel
Changes
to cancel your changes. For detailed instructions on configuring wireless security for the Router, turn to
“Appendix B: Wireless Security.”
Figure 5-19: Wireless Tab - Wireless Security
(WEP)
IMPORTANT:
If you are using WEP
encryption, always remember that each
device in your wireless network MUST use
the same WEP encryption method and
encryption key, or else your wireless network
Page 27 / 75
21
Chapter 5: Configuring the Wireless-G Broadband Router
The Wireless Tab - Wireless MAC Filter
Wireless-G Broadband Router with SRX
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
. To filter wireless users by MAC Address, either permitting or blocking access, click
Enable
.
If you do not wish to filter users by MAC Address, select
Disable
.
Prevent
. Clicking this button will block wireless access by MAC Address.
Permit Only
. Clicking this button will allow wireless access by MAC Address.
There are 50 fields provided in which you can list users, by MAC Address, whose access you wish to provide or
block. Just enter the MAC Address for the PC whose access you want to filter in one of the fields .For a more
convenient way to add MAC addresses, click the
Select
MAC Address From Networked Computers
button.
The
Networked Computers
screen will appear. Select the MAC Addresses you want. Then click the
Select
button.
Click the
Refresh
button if you want to refresh the screen. Click the
Close
button to return to the previous
screen.
Change these settings as described here and click the
Save Settings
button to apply your changes or
Cancel
Changes
to cancel your changes.
Figure 5-20: Wireless Tab - Wireless MAC Filter
Figure 5-21: Wireless Tab - Wireless MAC Filter - Networked
Computers
Page 28 / 75
22
Chapter 5: Configuring the Wireless-G Broadband Router
The Wireless Tab - Advanced Wireless Settings
Wireless-G Broadband Router with SRX
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 Set
. 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.
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
1
.
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 5-22: Wireless Tab - Advanced Wireless Settings
fragmentation
: breaking a packet into smaller units
when transmitting over a network medium that
cannot support the original size of the packet.
cts
(clear to send): a signal sent by a wireless
device, signifying that it is ready to receive data
beacon interval
: data transmitted on your wireless
network that keeps the network synchronized
dtim
: a message included in data packets
that can increase wireless efficiency.
Page 29 / 75
23
Chapter 5: Configuring the Wireless-G Broadband Router
The Security Tab - Firewall
Wireless-G Broadband Router with SRX
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 Preamble (default)
or
Short Preamble
.
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 Medium.
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 - 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 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 Passthrough
. These settings allow VPN tunnels using IPSec, PPTP, or L2TP protocols to pass through the
Router’s firewall. 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
. 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
. 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 5-23: 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 30 / 75
24
Chapter 5: Configuring the Wireless-G Broadband Router
The Access Restrictions Tab - Internet Access
Wireless-G Broadband Router with SRX
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 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
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 5-24: AAccess Restrictions Tab - Internet Access
Figure 5-25: Internet Policy Summary

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