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How to setup 2FA On Linux SSH Login

  This is a simple setup guide to enabling Two Factor Authentication (2FA) on Linux SSH login. I this article I wont go deep into setup and issues that I have faced when implementing this. First thing is first Update your system first. I have used Ubuntu 20.04 and it is always up to date. To enable 2FA you need to install google authenticator modules sudo apt install libpam-google-authenticator Configuration for PAM and SSHD Add the the following line to /etc/pam.d/sshd and After adding this line please restart the sshd services.  auth required pam_google_authenticator.so Go to /etc/ssh/sshd_config and check if the following line exist. Default value will be "no" so change it to "yes" to activate.  ChallengeResponseAuthentication yes Configuration for Authenticator In the terminal run google authenticator command It will ask few things to acknowledge by user. Details you can see from the below video. Once this part is done you are ready to use the 2FA in ubuntu. T
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Arduino and RS485 communication done from scratch....


This experiment was bit delayed due to lack of libraries for RS485 for Arduino. After lots of frustrations, i manage to make it work with soft-serial. Master controller send the command in bytes with [slaveid,status,level] and when a specific id slave response to it and lit and LED. Level byte is an analog value sent by master to dim the LED.
RS485 is a long distance communication protocol which is used is several industrial applications so it can be used to monitor and control devices in a twisted pair network.

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