Like other Linux distros, CentOS has the commands and tools to monitor a network. Before diving into the network monitoring I will show some changes that are made in CentOS 8 (and also RHEL 8). In CentOS 8 the default service to manage the network-related tasks is Network Manager. First I will show the connections … Continue reading Network Monitor in CentOS 8
Basically, ‘iptables’ is the packet filter system in RHEL systems. The best way to know what is ‘iptables’ is well written on the man page. In this article, I will show some simple and basic ‘iptables’ configurations. The three default chains in the iptables are Input, Forward, and Output. The ‘iptables –L’ command will show … Continue reading IPtables
In this article, I will show how to make ssh tunnel to securely connect to the remote server. When we browse a website, the browser uses http to connect to a website. But http is not secure so without https it might cause a certificate issue. If the certificate is not trusted by the clients, … Continue reading SSH Tunnel Configuration in CentOS
In this article, I am going to show how to configure SSH in a server to remotely connect to the client. First I will navigate to the .ssh directory. It is the directory where information about remotely connected devices is kept. For the client device, I will make a customized file and edit it. I … Continue reading SSH Configuration in CentOS
After a computer is booted, it starts with BIOS (or UEFI). The BIOS (or UEFI) system performs a series of tests which is known as ‘Power On Self Test’ (POST). The purpose of POST is to detect and connect CPU and key controllers. MBR (Master Boot Record) is the storage partition type. Another one is … Continue reading RHEL Boot Process
The DEVNET GRIND! 