cache dns with bind on centos7
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DNS Server Configuration on CentOS 7 (Caching DNS with BIND)
DNS (Domain Name System) Server is an essential part to any computer network. Today web communication cannot imagine without DNS Server. DNS is a client server protocol where DNS Client requests for the domain name resolution and DNS Server response on it. Every network should have a DNS Server because local DNS Server improves network performance by caching DNS information and serving DNS request locally. DNS Server can be configured either Windows or Linux operating system. In this article, I will discuss how to configure a caching DNS Server on CentOS 7/ RedHat 7 Linux with BIND9 Service. Domain Name System (DNS) and How It Works Communication between a workstation (PC) and a Server are always done by IP address. So, to get any information from any Web Server, you have to remember the IP address of that Server. But remembering a huge number of public IP addresses is almost impossible for the human being. To solve this issue, DNS technique is introduced in computer networking. The DNS technique can be best compared to a phone book where a user finds a phone number listed by the easier-to-remember name. So, the DNS can be defined as a mapper between human [...]
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Essential Networking Skills for Job Seekers in IT industry | March 18, 2025
The Information Technology (IT) industry is one of the most dynamic and rapidly evolving fields in the modern job market. With continuous advancements in technology, businesses are always on the lookout for skilled IT professionals who can adapt to new trends, troubleshoot complex systems, and enhance cybersecurity measures. However, technical knowledge alone is not enough to secure a job in the IT industry. One of the most critical factors in landing a job and advancing in an IT career is [...]
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MikroTik HotSpot One to One NAT/Universal HotSpot NAT | September 27, 2020
MikroTik Hotspot is an awesome service that can be customized widely. When MikroTik Hotspot is enabled on an interface, it adds dynamic destination NAT rules which will redirect all HTTP and HTTPS requests from unauthorized users to the Hotspot authentication proxy. So, no user can get internet access in Hotspot network without authentication. MikroTik Hotspot also uses one to one NAT providing an IP address from selected IP Pool and this IP address handles user’s data and limitation. Sometimes we [...]
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How to Use Old Router as Range Extender to Boost WiFi Signal | October 7, 2019
WiFi is a technology to turn wired internet into WiFi internet and used in every home and office. Wireless internet gives you the freedom to use the internet without sitting in a single place. It is also true that speed performance drop in Wi-fi due to weak signal or interference. Sometimes laying a physical wired connection in every room is not possible. So Wi-Fi range extender setup helps you to boost signal strength. Instead of buying a new range extender [...]
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Reset Mozilla Firefox to Default Settings | August 26, 2015
Mozilla Firefox is a free and open source web browser developed Mozilla Corporation. Mozilla Firefox is available for most of the popular operating system like Windows, macOS and Linux operating system. It is also a default web browser in Linux operating system. Mozilla Firefox is a popular web browser to any online user. It is said that no online user can go a single day without this Browser. I am also a fan of Mozilla Firefox browser and using this [...]
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MikroTik OpenVPN Configuration on TCP Port 443 with Windows OS | April 6, 2020
MikroTik OpenVPN is an amazing VPN solution. IT provides a secure and encrypted VPN tunnel across public network. Unlike PPTP and L2TP VPN Services which are poorly designed and can easily be blocked, OpenVPN can highly be customized and even can be run on so popular TCP Port 443. So, OpenVPN cannot easily be blocked. OpenVPN uses SSL/TLS Certificates. So, OpenVPN Tunnel is a trusted tunnel to send and receive data across public network. OpenVPN is a site to site [...]
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How to Create Free SSL/TLS Certificate with OpenSSL | July 23, 2021
SSL/TLS certificate is required to encrypt data sent over internet communication. Without encryption, the sent data can be hacked by the middle man attack. SSL/TLS certificate is usually a pair key, public key and private key, solution where data is encrypted with public key and decrypted with private key. In public communication, public key is required to be signed by a CA (certificate authority) but in private communication, there is no need to be signed by any CA. If we [...]
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MikroTik Send Browsing Log to Remote Syslog Server | August 18, 2019
MikroTik RouterOS is capable of logging various system events as well as user browsing information. Logs can be saved in router’s memory (RAM), disk, file, sent by email or even sent to remote syslog server. Sometimes it may require saving user browsing log by the law. So, a syslog server is an essential part to any network. In this article, I will discuss how to configure MikroTik Router to keep user browsing log and send that log to remote syslog [...]
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Things to Consider When Developing a Mobile App | February 27, 2022
Building a mobile app is one of the best ways to engage your target market and build an audience. If you want to develop a mobile application that will be truly successful, you need to consider every aspect of the development process. At the same time, there are many things to think about when developing a mobile app. Apps are designed to solve problems for people; if you are thinking about creating an app, you need to think about why [...]
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Computer Network Topology Outline | September 12, 2017
The first thing that has to study about a network is its physical shape or design layout. It will be extremely important when a wiring scheme and design are selected for a new network installation. Actually Network Topology refers to physical shape or design layout of a network. Network topology determines how different nodes in a network are connected and how these nodes communicate to each other. Types of Computer Network Topology Network really has two shapes or two types [...]
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