Wifi passive site survey using Ekahau

This video describes the process of mapping wifi coverage of an exisiting wifi deployment. Wifi data is collected by listening to beacons, since the software only passively listen to wifi transmissions this is called a passive survey. Ekahau software is the tool that was used for this video, there are other product which has a similar functionality.

[WinError 10054] An existing connection was forcibly closed by the remote host

I got this error when I was working on a Python script which use telnet to execute some show commands in Cisco 3650 and Cisco 2960 switches. Strangely I only got this error with Cisco 3650 (16.3.5b) switches.

[WinError 10054] An existing connection was forcibly closed by the remote host 


I was in a rush to get the script working and the work around below fixed the issue. 


1) The most useful method troubleshoot this was enabling debug in telnetlib

telnet = telnetlib.Telnet(ipOfRouterf)
telnet.set_debuglevel(1000)

2) Looking at the output with debugging on, it looked like that this issues is caused by the "exit" command in Cisco CLI.

cmd1 = 'show snmp location'

telnet = telnetlib.Telnet(ipOfRouterf)

telnet.set_debuglevel(1000)

telnet.read_until(b"Username: ",3)

telnet.write(user.encode('ascii') + b"\r\n")

telnet.read_until(b"Password: ",3)

telnet.write(password.encode('ascii') + b"\r\n")

telnet.write(cmd1.encode('ascii')+b"\r\n")

telnet.write(b"exit\r\n")

cmdOUT1 = telnet.read_all().decode('ascii')

print(cmdOUT1)

3) The work around I applied was to remove "exit" ,  enter a command that is invalid but unique so that telnet.read_until('testtest1234') can find it and then use telnet.close() instead of "exit"

cmd1 = 'show cdp neighbor'
cmd2 = 'show snmp location'

telnet = telnetlib.Telnet(ipOfRouterf,timeout = 3)
telnet.set_debuglevel(1000)
  
telnet.read_until(b"Username: ",3)

telnet.write(user.encode('ascii') + b"\r\n")
  
telnet.read_until(b"Password: ",3)
 
telnet.write(password.encode('ascii') + b"\r\n")
  
telnet.write(b"\r\n")
telnet.write(b"\r\n")
telnet.write(cmd1.encode('ascii')+b"\r\n")
telnet.write(b"\r\n")
telnet.write(cmd2.encode('ascii')+b"\r\n")
telnet.write(b"\r\n")
  
telnet.write(b"testtest1234\r\n")
  
cmdOUT1 = telnet.read_until(b"testtest1234").decode('ascii')

telnet.close()

print(cmdOUT1)

Screen record in Windows using PowerPoint

In Mac OS you can screen record easily using quick time, but in Windows I have been struggling to find a way to do the same. Then I came across this function in PowerPoint. You can use this to screen record and voice over. check the screenshots below.

Windows 10 64bit
MS office professional plus 2016

1) Go to Insert --> Screen Record 

2. Click record . And Windows key + shift  + Q to stop recording

3) Once you stop recording the recorded video will appear as an embedded video in the ppt slide. Right click on the video and save it on to your desktop as a mp4 file.