Wi-Fi, or IEEE 802.11, is the standard for wireless LANs, or WLANs. The abbreviation Wi-Fi stands for Wireless Fidelity, and resembles the Hi-Fi acronym. It represents a whole collection of protocols within the same family of Ethernet and Token Ring.
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It is specified by various IEEE 802.11 specifications.
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IEEE 802.11 sends network packets from the sending host to one (Unicast) or more (Multicast/Broadcast) receiving hosts.
The 802.11 protocols specify a wireless shared network, which means that the maximum bandwidth is only available to one user at a time.
See the CaptureSetup/WLAN page for instructions how to capture from WLAN's (including monitor mode), and see the CaptureSetup page for general information on capturing on WLAN's and other media.
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802.11 Standards
The basic 802.11 standards are:
- 802.11 (2MBit/s 2.4GHz) First generation of WLAN equipment; allows 1 and 2 Mbps.
- 802.11b (11MBit/s 2.4GHz) Second generation of WLAN equipment, and the first generation to receive widespread use; allows 1, 2, 5.5 and 11 Mbps.
- 802.11a (54MBit/s 5GHz)
- 802.11g (54MBit/s 2.4GHz)
- 802.11n Enhancements for Higher Throughput
Some additional 802.11 standards are:
- 802.11i (Security WPA1 and WPA2) No change to data rate. Improvement in security.
- 802.11h (Spectrum and Transmit Power Management)
- 802.11e (Quality of service, packet busting)
- 802.11d International (country-to-country) roaming extensions
- 802.11f Inter-Access Point Protocol (IAPP)
- 802.11j Extensions for Japan
History
XXX - add a brief description of 802.11 history
802.11 vs. 'fake Ethernet' captures
When capturing with Wireshark (or other tools using libpcap/WinPcap, such as TcpDump / WinDump) there are two ways in which 802.11 can be supplied by the system and stored in a capture file:
- 'real' 802.11: the hardware/driver provides the actual protocol data that travels over the air, complete with 802.11 headers. (There are variants of this in which 'radio information' such as signal strength can be provided as well.)
- 'fake' Ethernet: the hardware/driver translates the 802.11 headers into Ethernet headers so that the whole packet looks like a normal Ethernet packet. If the hardware/driver is doing this, all 802.11-specific management and control frames are usually discarded, as there's no equivalent to them in Ethernet (although some drivers might use a non-standard way of making them look like Ethernet packets, such as using a special Ethernet packet type).
Detailed information about how to capture 802.11 traffic can be found at the CaptureSetup/WLAN page.
Protocol dependencies
- 802.11 is the lowest software layer, so it only depends on hardware.
Example traffic
One ICMP Ping Request and response session from Station(STA1 to station(STA2) via Access point(AP)
ICMP ECHO request
ICMP ECHO request
- ICMP Echo request (802.11 data packet with source STA1, Destination STA2, To DS bit set) This packet is transmitted from STA1 and received by AP
- ACK(802.11 control packet, dest STA1) This packet is transmitted by AP and recieved by STA1
- ICMP Echo request (802.11 data packet with source STA1, Destination STA2, From DS bit set) This packet is transmitted by AP and received by STA2.
- ACK(802.11 control packet Dest AP) This packet is sent to AP by STA2 to acknowledge reciept of the Echo request packet.
ICMP ECHO Response
- ICMP Echo response(802.11 data packet with source STA2, Destination STA1, To DS bit set) This packet is transmitted from STA2 and received by AP
- ACK(802.11 control packet, dest STA2) This packet is transmitted by AP and recieved by STA2
- ICMP Echo response (802.11 data packet with source STA2, Destination STA1, From DS bit set) This packet is transmitted by AP and received by STA1.
- ACK (802.11 control packet Dest AP) This packet is sent to AP by STA1 to acknowledge reciept of the Echo response packet.
XXX - Add example traffic here (as Wireshark screenshot).
Wireshark
The 802.11 dissector is fully functional. It supports WEP and WPA/WPA2 decryption (see HowToDecrypt802.11 for details) and 802.11n.
Capturing 802.11 traffic can be tricky, see CaptureSetup page for instructions how to capture from WLAN's (including monitor mode) and other media.
Preference Settings
802.11 is a complex protocol and Wireshark has a variety of 802.11-related preferences as a result.
The reassembly and retransmission settings can affect the way that higher-layer information is dissected and displayed. The FCS and Protection bit settings can affect how frames are decrypted. For detailed information about the decryption settings, see HowToDecrypt802.11.
You can also add 802.11-specific information to the packet list.
Example capture file
SampleCaptures/Network_Join_Nokia_Mobile.pcap
Display Filter
A complete list of 802.11 display filter fields can be found in the wlan, wlan_mgt, and wlan_aggregate display filter references.
- Show only the 802.11-based traffic: Show only the 802.11-based traffic to and from 802.11 MAC address 08:00:08:15:ca:fe: Hide beacon frames: Show management frames for a specific SSID:
Air Shark Wifi Router Manual
Capture Filter
Newer versions of libpcap support raw 802.11 headers via the 'wlan' link type. Older versions must use 'ether' or 'link' via fake Ethernet headers, and might not support 802.11 capture at all.
- Capture only the 802.11-based traffic to and from 802.11 MAC address 08:00:08:15:ca:fe:
- Filter out beacon frames:
See CaptureSetup/WLAN page for instructions on how to capture from WLANs (including monitor mode).
External links
- 802.11 Alphabet Soup a tutorial of the various 802.11 letters. Dated August 05, 2002.
Discussion
Type | Price (£) | Stock |
---|---|---|
4G Sharkfin Pack | 299.99 | 2 |
Product DetailsMore Images
Perfect for Low Profile Campervans and VW Conversions
Benefits:
Our 4G Sharkfin Roof Antenna can give you a significant improvement over the performance of your mobile phone. Best for an “On The Move” connection, as and when you need it without having to rely on campsites. The Sharfkin 4G Antenna is compact, discreet and has a low visual impact as well as being ground-plane independent.
Installation: Fitted Installation
What’s Included:
- 4G MiMo Sharkfin Roof Antenna (1.85inch / 47mm High)
- Max Roof Thickness 8mm
- 2 x 5m SMA Low Loss Extension Cables (if required, shorter cables available on request)
- Quick Mount Magnetic MiFi Docking / Charging Station, 12v cable and adhesive rear mounting
- 4G MiFi Device – Fully unlocked with additional documentation
At just 45mm high (1.85”) it is the leading 4G antenna in discreet automotive styling. The underside consists of a non-permeable 3M adhesive foam pad and an adjustable threaded internal brace, through which the cables travel, for a totally weatherproof installation.
The installation requires an 18mm hole to be drilled through the roof.
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4G Sharkfin Roof Mount Antenna
Our 4G Sharkfin Roof Mount Antenna has been designed for low line campervans, VW conversions and commercial vehicle use and can be fitted to roofs upto 8mm thick.
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Air Shark Wifi Router Manual
Antenna Technical Specifications
Wifi Router Setup
- MIMO antenna configuration
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- Omnidirectional radiation
- Operational Bands LTE / Cellular
- Height 1.85” (47mm)
- Diameter/Length 6.77” (172mm) x 2.4″ (61mm)
- Max Roof Thickness 8mm
- Required mounting hole size (mm) 18 (0.71”)
- 698-960MHz – 2.3dBi
- 1700-2700MHz – 5dBi
- Cable length 5m
- SMA cables
- Does not require a metallic ground plate
- Coated with High Impact UV
4G Huawei MiFi Specifications:
Amazon Wifi Routers
- Fully factory unlocked to all mobile networks
- Fast Boot
- Width 96.8mm, Height 58mm, Depth 13.5mm
- Weight 82g (including the battery)
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- Display: 1.45” TFT LCD
- Battery: 1500mAh,Maximum working time: 8 hours
- Maximum standby time: 300 hours while Wi-Fi is off
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- Wi-Fi Connection Number: Up to 10 simultaneous users/devices
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