MS-DOS :


+  MS-DOS : (abréviation de Microsoft Disk Operating System) est le système d'exploitation de type DOS développé par Microsoft pour l'IBM PC d'abord, puis pour les compatibles PC. Il s'agit d'un système fonctionnant en mode réel, monotâche et mono-utilisateur, et équipé par défaut d'une interface en ligne de commande. Des années 1980 au début des années 1990, il a été le système le plus utilisé sur compatible PC, avant d'être progressivement remplacé par des systèmes d'exploitation plus évolués, notamment Windows. Son développement est maintenant arrêté.

+ Articles connexes :

Troubleshooting WiFi using Windows 7 native tools and inSSIDer 2.1


+ Below looks at utilizting the native Windows 7 tools to analysis the current wireless connectivity.  Application inSSIDer 2.1 (home edition) is a free tool  used to verify the SSID signal strenght and connection stats.
Kit: Windows 7 Laptop
Wireless Card: Intel(R) Dual Band Wireless-AC 7265
inSSIDer 2.1.6 (Metageek)
WiFi Settings: SSID: vodafone-CFE3
Radio Band: 2.4GHz
Signal Stenght: -40dBm
Channel: 5
Windows 7 CMD:
Display wireless interfaces and connection state.
cmd->netsh wlan show interfaces
Display the wireless drivers installed.
cmd->netsh wlan show drivers
Display Signal Strenght/Radio type/Channel/Basic & Other rates supported
cmd->netsh wlan show network mode=bssid
Windows 7 GUI:
Wireless Network Connection Status –  Displays the Wireless Network Connection Status (SSID/Speed (Mbps)/Signal Quality/IP Address etc…)
Windows Network Diagnostics – Displays the Signal strength (dB) and channel number and much more
inSSIDer 2.1:
Filter by SSID name and radio band
2.4 GHz Channels Graph
Time Graph  – Signal Strength over time. Useful when roaming 

Window 7 – WIFI Trace Capture using Microsoft Message Analyser


Overview: Windows 7 built-in  trace  templates allow to captures Wi-Fi logs for analyses using Microsoft Message Analyser.
Microsoft Message Analyzer is a  tool for capturing, displaying, and analyzing protocol messaging traffic, events, and other system or application messages in network troubleshooting and other diagnostic scenarios.
Kit: Windows 7 Laptop
Wireless Card: Intel(R) Dual Band Wireless-AC 7265
Microsoft Message Analyzer V1.4
Enable Trace Servicenetsh ras set tracing * enabled
Trace Built-in ProfilesNetsh Trace show scenarios
Start Trace Captuenetsh trace start capture=yes scenario=wlan report=yes tracefile=q:\output\wlantrace1.etl
Stop Trace Capturenetsh trace stop
Disable Trace Servicenetsh ras set tracing * disabled
Browse to Q:\output folder
Open trace file Q:\output\wlantrace1.etl using Microsoft Message Analyzer program.
Apply below filter to the trace:
EAPOL or
Microsoft_Windows_WLAN_AutoConfig or
Microsoft_Windows_NWiFi or
Microsoft_Windows_NDIS
Trace Capture – Sucessful connection to  WI-FI NetworkSSID: Vodafone-CFE3
Security: WPA2-PSK
Logs returns with 4_WAY_COMPLETION message.
Successful connection.
Trace Capture – Unsucessful connection to  WI-FI Network (incorrect PSK)SSID: UPC31
Security: WPA2-PSK
Logs returns with PSK_MISMATCH message.

Cisco AP Sniffer Mode & Wireshark :


Overview: Cisco Access Point (sniffer Mode) can be configured to send wireless 802.11 packet captures to Wireshark running on Windows 7.
Kit: Windows 7 Laptop
Wireless Card: Intel(R) Dual Band Wireless-AC 7265
Wireshark Version 2.4.6
Cisco 2702i Access Point (Autonomous mode)
Lab Tolology:
Steps:
Connect to Autonomous Access Point using Putty
Configure Radio (2.4GHz) to sniffer mode. Access Point requires a reboot after assigning the radio interface to sniffer mode
• Interface Dot11Radio0 = 2.4GHz Radio Band
• Interface Dot11Radio1 = 5GHz Radio Band
Interface Dot11Radio0
Station-role sniffer
Send on all sniffer traffic to Windows 7 (192.168.255.100) via port UDP:5555
Sniffer ip-address 192.168.255.100 port 5555
Launch Wireshark and capture traffic on Local Area Connectioninterface.
Select capture with Protocol UDP and destination port 5555
Right click and Decode AS and select PEEKMOTE
Wireless 802.11 packet are now available for Analyses 

Cisco Spectrum Expert and Microwave Open RF Interference


Overview: Below outlines microwave RF interference on the 2.4GHz radio band using Cisco Spectrum Expert (SE) software and Cisco Access Point (Autonomous).
RF interfrecne is seen across Channels 8-16 and Duty Cycles increases up to  50% on Channels 9-11. 
Kit: Windows 7
Cisco 2702i Autonomous Access Point (Spectrum Mode)
Cisco Spectrum Expert 4.1.11
Microwave Oven
Steps:
Control Environment before switching on the mi
Connect (SSHv2) to Autonomous Access Point via putty.
Configure the AP into SE-Connect mode using these commands:
int dot11radio 0
station-role spectrum
exit
int dot11radio 1
station-role spectrum

exit
NSI key is required to connect to the Cisco CleanAir Access Point
show spectrum status
Launch Cisco Spectrum Expert and connect to the Cisco 2700 Autonomous Access Point using IP Address and Key
Before Microwave:
Real Time FFT
FFT Duty Cycle
Channel Utilization
Channel Summary
Microwave Switched On:
Real Time FFT – Microwave Interference 
FFT Duty Cycle – Microwave Interference with Duty Cycle increasing across Channels 9-11.
Channel Utilization – Microwave Interference
Channel Utilization Vs Time – Microwave Interference
Channel Summary – Microwave Interference

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