![background image](http://html1.mh-extra.com/html/zyxel-communications/unified-security-gateway-zywall-300/unified-security-gateway-zywall-300_user-manual_9437251055.webp)
Appendix E Wireless LANs
ZyWALL USG 300 User’s Guide
1055
Note: Enabling the RTS Threshold causes redundant network overhead that could
negatively affect the throughput performance instead of providing a remedy.
Fragmentation Threshold
A
Fragmentation Threshold
is the maximum data fragment size (between 256
and 2432 bytes) that can be sent in the wireless network before the AP will
fragment the packet into smaller data frames.
A large
Fragmentation Threshold
is recommended for networks not prone to
interference while you should set a smaller threshold for busy networks or
networks that are prone to interference.
If the
Fragmentation Threshold
value is smaller than the
RTS/CTS
value (see
previously) you set then the RTS (Request To Send)/CTS (Clear to Send)
handshake will never occur as data frames will be fragmented before they reach
RTS/CTS
size.
Preamble Type
Preamble is used to signal that data is coming to the receiver. Short and long refer
to the length of the synchronization field in a packet.
Short preamble increases performance as less time sending preamble means
more time for sending data. All IEEE 802.11 compliant wireless adapters support
long preamble, but not all support short preamble.
Use long preamble if you are unsure what preamble mode other wireless devices
on the network support, and to provide more reliable communications in busy
wireless networks.
Use short preamble if you are sure all wireless devices on the network support it,
and to provide more efficient communications.
Use the dynamic setting to automatically use short preamble when all wireless
devices on the network support it, otherwise the ZyWALL uses long preamble.
Note: The wireless devices MUST
use the same preamble mode in order to
communicate.
IEEE 802.11g Wireless LAN
IEEE 802.11g is fully compatible with the IEEE 802.11b standard. This means an
IEEE 802.11b adapter can interface directly with an IEEE 802.11g access point
Summary of Contents for Unified Security Gateway ZyWALL 300
Page 2: ......
Page 30: ...Table of Contents ZyWALL USG 300 User s Guide 30 ...
Page 31: ...31 PART I User s Guide ...
Page 32: ...32 ...
Page 38: ...Chapter 1 Introducing the ZyWALL ZyWALL USG 300 User s Guide 38 ...
Page 46: ...Chapter 2 Features and Applications ZyWALL USG 300 User s Guide 46 ...
Page 64: ...Chapter 3 Web Configurator ZyWALL USG 300 User s Guide 64 ...
Page 74: ...Chapter 4 Installation Setup Wizard ZyWALL USG 300 User s Guide 74 ...
Page 116: ...Chapter 6 Configuration Basics ZyWALL USG 300 User s Guide 116 ...
Page 184: ...Chapter 7 Tutorials ZyWALL USG 300 User s Guide 184 ...
Page 221: ...221 PART II Technical Reference ...
Page 222: ...222 ...
Page 288: ...Chapter 11 Registration ZyWALL USG 300 User s Guide 288 ...
Page 378: ...Chapter 14 Trunks ZyWALL USG 300 User s Guide 378 ...
Page 394: ...Chapter 15 Policy and Static Routes ZyWALL USG 300 User s Guide 394 ...
Page 408: ...Chapter 16 Routing Protocols ZyWALL USG 300 User s Guide 408 ...
Page 428: ...Chapter 19 NAT ZyWALL USG 300 User s Guide 428 ...
Page 454: ...Chapter 23 Authentication Policy ZyWALL USG 300 User s Guide 454 ...
Page 472: ...Chapter 24 Firewall ZyWALL USG 300 User s Guide 472 ...
Page 534: ...Chapter 27 SSL User Screens ZyWALL USG 300 User s Guide 534 ...
Page 536: ...Chapter 28 SSL User Application Screens ZyWALL USG 300 User s Guide 536 ...
Page 544: ...Chapter 29 SSL User File Sharing ZyWALL USG 300 User s Guide 544 ...
Page 638: ...Chapter 35 ADP ZyWALL USG 300 User s Guide 638 Figure 448 Profiles Protocol Anomaly ...
Page 682: ...Chapter 37 Content Filter Reports ZyWALL USG 300 User s Guide 682 ...
Page 700: ...Chapter 38 Anti Spam ZyWALL USG 300 User s Guide 700 ...
Page 722: ...Chapter 39 Device HA ZyWALL USG 300 User s Guide 722 ...
Page 738: ...Chapter 40 User Group ZyWALL USG 300 User s Guide 738 ...
Page 744: ...Chapter 41 Addresses ZyWALL USG 300 User s Guide 744 ...
Page 756: ...Chapter 43 Schedules ZyWALL USG 300 User s Guide 756 ...
Page 772: ...Chapter 45 Authentication Method ZyWALL USG 300 User s Guide 772 ...
Page 794: ...Chapter 46 Certificates ZyWALL USG 300 User s Guide 794 ...
Page 806: ...Chapter 48 SSL Application ZyWALL USG 300 User s Guide 806 ...
Page 811: ...Chapter 49 Endpoint Security ZyWALL USG 300 User s Guide 811 ...
Page 866: ...Chapter 50 System ZyWALL USG 300 User s Guide 866 ...
Page 873: ...Chapter 51 Log and Report ZyWALL USG 300 User s Guide 873 ...
Page 886: ...Chapter 51 Log and Report ZyWALL USG 300 User s Guide 886 ...
Page 916: ...Chapter 54 Packet Flow Explore ZyWALL USG 300 User s Guide 916 ...
Page 918: ...Chapter 55 Reboot ZyWALL USG 300 User s Guide 918 ...
Page 920: ...Chapter 56 Shutdown ZyWALL USG 300 User s Guide 920 ...
Page 948: ...Chapter 58 Product Specifications ZyWALL USG 300 User s Guide 948 ...
Page 1014: ...Appendix A Log Descriptions ZyWALL USG 300 User s Guide 1014 ...
Page 1124: ...Appendix F Open Software Announcements ZyWALL USG 300 User s Guide 1124 ...