Setup OpenDNS for your Home Network

In a recent project, I started using OpenDNS over other available options. Initially, my home network was using my ISP’s DNS servers. They’re slow and do almost nothing to keep my information safe. So, why, OpenDNS? Websites load faster and have a guaranteed uptime of 100%. Its highly customizable, allowing users to pick and choose […]

Configuring SSL/TLS on Nagios

This post describes how to configure SSL/TLS on your Nagios server. During the initial setup, I’m using CentOS 7.x. yum install -y mod_ssl openssl Next, go to root’s home directory. If you are not logged in as root, go ahead and do so. cd ~ Next will need to generate a Private Key File. This […]

Configure NRPE/XINETD

Enter the following commands into your terminal session: cd /tmp wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz After the file has downloaded, you will need to unzip the file tar -xzf linux-nrpe-agent.tar.gz Then enter the new directory. cd linux-nrpe-agent Inside the new directory, there will be a number of scripts and config files. You will need to run “fullinstall” ./fullinstall […]

Adding more users to a VNC Server

If you already have a VNC Server, then you will know how this works. We’re going to add another user to the VNC. It’s a very similar process to going through the initial installation process. Go ahead and log in to your system and switch over to root… If you are not already signed in as root. […]

Install VNC-Server on CentOS 7

First, i logged into my server as root, to make things a little easier. I would recommend doing the same thing to help speed up the processes. After I logged into the system, I installed VNC-server. yum install tigervnc-server Once all the packages were installed, go ahead and run an update. yum -y update && […]

Slow SSH Login | UseDNS=no

Problem: When SSH’ing into a server, connection, and login take a long time. Connect to a server Attempt to log in, and wait to see how long the connection takes. 10+ seconds is too long and should be investigated. Wait for the password prompt and then proceed to cat /etc/ssh/sshd_config | less use vi to […]

Slow SSH Login | GSSAPIauthentication

Configuring your ESXi Server | IP address and Hostname

After you have downloaded and installed VMware’s ESXi, you will need to configure the Hostname and maybe the IP address… First, you will need to log in. By default, the main/admin account is “root”. Below, you will see “System Customization”… In this menu, you can make all the adjustments you need. By default, your ESXi […]

Wireshark | Getting Started

Wireshark is an open source packet analyzer, software analysis, network troubleshooting tool. What does it do? Wireshark allows its user to view raw data that is being transmitted over a network. Its main purpose is to encapsulate network packets so they can be analyzed for troubleshooting an issue. How is it different from TCPdump? Wireshark is […]

NLOAD| MONITOR NETWORK TRAFFIC

nload is a command line tool that is used to monitor network traffic and bandwidth usage in real time. It displays inbound and outbound traffic using two graphs. While providing additional information like total transferred data and the minimum/maximum network usage. (See Below) First, we’ll need to install the application: Linux $ sudo apt-get install […]