Quick Reference Guide

ProSafe Wireless-N VPN Firewall SRXN3205 Reference Manual
4-18 Wireless Configuration
v1.0, January 2010
3. Enter the appropriate information in the fields described below:
• RTS Threshold (256 - 2346, default 2346). The RTS (Request to Send Threshold) is the
packet size that determines if the CSMA/CD (Carrier Sense Multiple Access with
Collision Detection) mechanism or the CSMA/CA (CSMA with Collision Avoidance)
mechanism should be used for packet transmission. With the CSMA/CD transmission
mechanism, the transmitting station sends the actual packet as soon as the silence period
has expired. With the CSMA/CA transmission mechanism, the transmitting station sends
an RTS packet to the receiving station, and waits for the receiving station to return a CTS
(Clear to Send) packet before sending the actual packet data. The default is 2346.
• Fragmentation Length (256 - 2346, default 2346). This is the maximum packet size
used for fragmentation. Packets larger than the size entered in this field will be
fragmented. The fragment threshold value must be larger than the RTS threshold value.
The default is 2346.
• Beacon Interval (20-1000, default 100). This is the interval time (in ms) between beacon
transmissions. The value must be between 20 ms and 1000 ms. The default is 100ms. The
interval time allows for the synchronization of the wireless network.
• Preamble Mode. A long transmit preamble may provide a more reliable connection or a
slightly longer range. A short transmit preamble gives better performance. The Automatic
settings automatically handles both long and short preambles. The default is Automatic.
4. Click Apply to save your settings.
Restricting Wireless Access by MAC Address
Enabling of the access control list lets you block the wireless access privileges of any specified
stations through the VPN firewall. When you enable access control, the VPN firewall only accepts
connections from wireless clients on the selected access control list. This provides an additional
layer of security.
Note: When you configure the VPN firewall from a wireless computer whose MAC
address is not in the access control list, and you select Turn Access Control On,
you will lose your wireless connection when you click Apply. You must then
access the VPN firewall from a wired computer or from a wireless computer that
is on the access control list to make any further changes.