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security

Find Active SSH Servers on a Subnet

December 4, 2017 mike Sysadmin

This example lists out the IPs that are on the SSH port (22) on a particular subnet. List out IPs (only) of open ssh ports

datacenter

Port Scan the Entire Internet in 5 Minutes?

January 19, 2017 mike Sysadmin

One of my favorite sub-reddits is /r/coolgithubprojects. I check it out a few times a week looking for interesting open source projects. One interesting project

netstat sort example

Using netstat to Monitor Connections and DDoS on Your Server

January 14, 2017 mike Sysadmin

Netstat is a wonderful Linux command to peak into networking processes on your server. Combined with other commands such as sort netstat can become extremely

iphone pin code

You have a 23.34% Chance of Guessing a Four Digit Pin Combination

December 12, 2016 mike Sysadmin

According to Datagenetics 10.71% of 4 digit passcodes are 1234. Data Genetics did some number crunching on ATM pin data, not sure how they got

how-to-setup-password-less-loggin-with-ssh-keys

How to Setup Password-less Loggin with SSH Keys

November 28, 2016 mike Sysadmin

Having to type in passwords manually all day long into servers you manage is a pain. You should be using ssh keys, they’re more secure,

ssh into ubuntu

Securing your Ubuntu SSH Server the Right Way

November 14, 2016 mike Sysadmin

If you’ve ever managed an ssh server that’s open on the internet server you might have noticed a bunch of IPs scanning and trying to

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