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SonicWALL, Inc.


Wireless/Advanced

Wireless > Advanced

To access Advanced configuration settings for the wireless security appliance, log into the SonicWALL, click Wireless, and then Advanced.

Beaconing & SSID Controls

  1. Select Hide SSID in Beacon. If you select Hide SSID in Beacon, your wireless network is invisible to anyone who does not know your SSID. This is a good way to prevent "drive by hackers" from seeing your wireless connection.
  2. Type a value in milliseconds for the Beacon Interval. Decreasing the interval time makes passive scanning more reliable and faster because Beacon frames announce the network to the wireless connection more frequently.

Configurable Antenna Diversity

The wireless security appliance employs dual 5 dBi antennas running in diversity mode. The default implementation of diversity mode means that one antenna acts as a transmitting, and both antennas act as potential receiving antenna. As radio signals arrive at both antennas on the wireless security appliance, the strength and integrity of the signals are evaluated, and the best received signal is used. The selection process between the two antennas is constant during operation to always provide the best possible signal.

To allow for external (e.g. higher gain uni-directional) antennas to be used, antenna diversity can now be disabled from the Wireless > Advanced > Advanced Radio Settings section.

The Antenna Diversity setting determines which antenna the wireless security appliance uses to send and receive data. You can select:

Select High from the Transmit Power menu to send the strongest signal on the WLAN. For example, select High if the signal is going from building to building. Medium is recommended for office to office within a building, and Low or Lowest is recommended for shorter distance communications.

  1. Select Short or Long from the Preamble Length menu. Short is recommended for efficiency and improved throughput on the wireless network.
  2. The Fragmentation Threshold (bytes) is 2346 by default. Increasing the value means that frames are delivered with less overhead but a lost or damaged frame must be discarded and retransmitted.
  3. The RTS Threshold (bytes) is 2432 by default. If network throughput is slow or a large number of frame retransmissions is occurring, decrease the RTS threshold to enable RTS clearing.
  4. The default value for the DTIM Interval is 3. Increasing the DTIM Interval value allows you to conserve power more effectively.
  5. The Station Timeout (seconds) is 300 seconds by default. If your network is very busy, you can increase the timeout by increasing the number of seconds in the Station Timeout (seconds) field.
  6. Set the Maximum Client Associations to limit the number of stations that can connect wirelessly at one time. The default is 32.

Click Restore Default Settings to return the radio settings to the default settings.

Click Apply in the top right corner of the page to apply your changes to the security appliance.

Advanced Radio Settings

The following other advanced settings can be configured.

  1. Enable Short Slot Time: Select Enable Short Slot Time to increase performance if you only expect 802.11g traffic. 802.11b is not compatible with short slot time.
  2. Select High from the Transmit Power menu to send the strongest signal on the WLAN. For example, select High if the signal is going from building-to-building. Medium is recommended for office-to-office within a building, and Low or Lowest is recommended for shorter distance communications.
  3. Select Short or Long from the Preamble Length menu. Short is recommended for efficiency and improved throughput on the wireless network.
  4. The Fragmentation Threshold (bytes) is 2346 by default. Increasing the value means that frames are delivered with less overhead but a lost or damaged frame must be discarded and retransmitted.
  5. The RTS Threshold (bytes) is 2432 by default. If network throughput is slow or a large number of frame retransmissions is occurring, decrease the RTS threshold to enable RTS clearing.
  6. The default value for the DTIM Interval is 3. Increasing the DTIM Interval value allows you to conserve power more effectively.
  7. The Association Timeout (seconds) is 300 seconds by default. If your network is very busy, you can increase the timeout by increasing the number of seconds in the Association Timeout (seconds) field.
  8. Set the Maximum Client Associations to limit the number of stations that can connect wirelessly at one time. The default is 32.
  9. Data Rate: Select the speed at which the data is transmitted and received. Best automatically selects the best rate available in your area given interference and other factors. You can select: Best, 6 Mbps, 9 Mbps, 12 Mbps, 18 Mbps, 24 Mbps, 36 Mbps, 48 Mbps, or 54 Mbps.
  10. Protection Mode: Protection can decrease collisions, particularly where you have two overlapping SonicPoints. However, it can slow down performance. Auto is probably the best setting, as it will engage only in the case of overlapping SonicPoints.
  11. Protection Rate: The protection rate determines the data rate when protection is on. The slowest rate offers the greatest degree of protection but the slowest data transmission rate. Choose 1 Mbps, 2 Mbps, 5 Mbps, or 11 Mbps.
  12. Protection Type: Select the type of handshake used to establish a wireless connection: CTS-only or RTS-CTS. 802.11b traffic is only compatible with CTS.
  13. CCK OFDM Power Delta: This setting determines the difference in transmission power between 802.11b (CCK mode) and 802.11g (OFDM mode). When both 802.11g and 802.11b are used simultaneously, 802.11g covers a smaller physical area than 802.11b. Increasing the CCK OFDM Power Delta lowers the transmission power for 802.11b, so the two radio modes will cover the same area. Choose 0 dBm, 1 dBm, or 2 dBm.
  14. Click Apply in the top right corner of the page to apply your changes to the security appliance.

Click Restore Default Settings to return the radio settings to the default settings.

 

 


www.SonicWALL.com
SonicWALL, Inc.
http://www.sonicwall.com
1160 Bordeaux Drive
Sunnyvale, CA 94089-1209
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