Author Archives: admin

Configuring Dynamic NAT on Cisco Router

Network Address Translation (NAT) is a method of mapping one IP Address space into another IP address space by changing network address information in the IP head of packet while they are crossing routing devices such as routers or firewalls. Dynamic NAT allows internal hosts to access the Internet by assigning each host a unique… Read More »

Cisco Router Initial and Basic Security Configuration

The following article is to describe how to perform initial and basic security configuration and on the Cisco router using the Cisco command-line interface (CLI) on IOS router operating system. 1. Configuring device hostname Cisco router is packed with factory-assigned default hostname as “Router”. However, you will want to have an identical device hostname for… Read More »

DHCP Server Configuration on CentOS 8

Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on Internet Protocol networks to dynamically assign network configuration such as IP address, Subnet Mask, Domain Name, DNS Server IP Address for computer system on the network. DHCP Server Installation 1. Installing the DHCP server package using the command dnf -y install dhcp-server 2.… Read More »

DNS Server (BIND) Configuration on CentOS 8

Introduction Domain Name System (DNS) is the service which helps to resolve a fully qualified domain name (FQDN) into an IP address and a reverse translation of an IP Address to user friendly domain name. All Linux distributions are using BIND (Berkeley Internet Name Domain) which was developed by a student of Berkeley University in… Read More »

SSH Secured File Transfer Protocol (SFTP)

What is SSH File Transfer Protocol SSH File Transfer Protocol (SFTP) is is a secure file transfer protocol running over SSH connection of port 22, which is replacing the legacy FTP protocol. It supports security and authentication functionality. If you are on Windows Operating system and you want to transfer files between your Windows client to… Read More »

Configuring OpenSSH on CentOS 8

OpenSSH is a free version of version of the Secure Shell (SSH) protocol family of tools for remotely controlling, or transferring files between computer systems. The traditional tool like telnet which is insecure and transmit the user’s password in cleartext. SSH is a secured remote control protocol and it can be authenticated using Password Authentication and Public Key… Read More »

NTP Server and Client Configuration

NTP Server The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems. You may want to have NTP server in your organization to have a standard timing synchronization across the system and network device. Server Information Server hostname: centos_srv01 Server IP Address: 1. CentOS can provide this NTP server… Read More »

Initial Configurations for Newly Installed CentOS 8 Server

Network Configuration Settings During the installation of CentOS 8, we already assigned the static IP address configuration. The following steps are just in case you want to modify/change to any other IP addresses or DNS server IP. NOTE: Replace the interface name to your own, it’s difference for any other system. In my case, I… Read More »

Installing CentOS 8 Server

CentOS community have just released its latest version 8 to world and available to download via it official site In this article, I will show you how to install this latest server operating system in detail step-by-step guide. I will use VMware Workstation Pro 15 in my lab but I will not go through the… Read More »