WLAN DEMO SETUP

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WLAN DEMO SETUP

• 802.11b

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WLAN DIAGRAM
PDA
Enable DHCP
ap1
C-500 HUB
TO XUNET
Laptop
LAN Port
11 Mbps Wi-Fi Connection (802.11b)
Enable DHCP
WAN Port
Access Point
PC
Enable DHCP
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Ap1 Setup

• WAN (connected)
• IP 202.133.197.48
• Mask 255.255.255.192
• Gateway 202.133.197.1
• LAN (Disconnected)
• IP 192.168.253.1
• Mask 255.255.255.0
• Primary DNS 202.133.197.15
• 202.133.197.10
• DHCP Service
• IP Range 192.168.253.2 192.168.253.254

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Definition of Terms

• 802.11b (also referred to as 802.11 High Rate or
  Wi-Fi)
• - an extension to 802.11 that applies to
  wireless LANS and provides 11 Mbps transmission
  (with a fallback to 5.5, 2 and 1 Mbps) in the 2.4
  GHz band. 802.11b uses only DSSS. 802.11b was a
  1999 ratification to the original 802.11
  standard, allowing wireless functionality
  comparable to Ethernet.
• AP
• Short for Access Point, a hardware device or a
  computer's software that acts as a communication
  hub for users of a wireless device to connect to
  a wired LAN. APs are important for providing
  heightened wireless security and for extending
  the physical range of service a wireless user has
  access to.

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802.11 Networking Framework

• Infrastructure Mode
• An 802.11 networking framework in which devices
  communicate with each other by first going
  through an Access Point (AP). In infrastructure
  mode, wireless devices can communicate with each
  other or can communicate with a wired network.
  When one AP is connected to wired network and a
  set of wireless stations it is referred to as a
  Basic Service Set (BSS). An Extended Service Set
  (ESS) is a set of two or more BSSs that form a
  single subnetwork. Most corporate wireless LANs
  operate in infrastructure mode because they
  require access to the wired LAN in order to use
  services such as file servers or printers.

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802.11 Networking Framework

• Infrastructure Mode
• An access point (AP) is commonly installed to
  act as a central hub for the WLAN "infrastructure
  mode". The AP is hard wired to the cabled LAN
  to provide Internet access and connectivity to
  the wired network. APs are equipped with antennae
  and provide wireless connectivity over a
  specified area referred to as a cell.

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802.11 Networking Framework

• Ad-hoc Mode
• An 802.11 networking framework in which devices
  or stations communicate directly with each other,
  without the use of an access point (AP). Ad-hoc
  mode is also referred to as peer-to-peer mode or
  an Independent Basic Service Set (IBSS). Ad-hoc
  mode is useful for establishing a network where
  wireless infrastructure does not exist or where
  services are not required.

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802.11 Networking Framework

• Ad-hoc Mode
• Equipped with wireless NICs, an ad hoc network
  could be established which compares to a
  peer-to-peer wired network. Both devices act as
  servers and clients in this environment. Although
  it does provide connectivity, security is at a
  minimum along with throughput. Another problem
  with this type of network is compatibility. Many
  times NICs from different manufacturers are not
  compatible.