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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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How to Add New Domains to BIND DNS Server | July 5, 2019
DNS (Domain Name System) Server is an essential part to any computer network. So, it is always suggest keeping a DNS Server in every network. How to configure a DNS Server with BIND package was discussed in my previous article. A common question among the fresher admins of BIND DNS is how to add a new domain to BIND DNS Server. For this, this article is designed to discuss the proper way to add multiple domains to BIND DNS Server. [...]
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The Role of Computer Networking in Modern Surveillance and Security | October 17, 2023
In the present computerized age, computer networking is significant in ensuring modern surveillance and security frameworks are viable and productive. The progressions in innovation have prompted the improvement of innovative arrangements, for example, solar power cameras, that depend on computer networks to upgrade surveillance capacities. This article investigates the role of computer networking in modern surveillance and security frameworks, with a particular spotlight on integrating solar-powered cameras. What is Computer Networking? A computer network gathers interconnected hubs or computing gadgets that [...]
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MikroTik Hotspot with Bandwidth Limitation and Prepaid Billing System | January 14, 2018
Say, you are a network administrator and want to establish a network that will have user bandwidth package management facility with prepaid billing system as well as partner advertisement facility. Then, MikroTik Hotspot Server Configuration with MikroTik User Manager Radius Server will be a wise decision. Because, MikroTik User Manager Radius Server is a user authentication, authorization and accounting application that will give facility to manage user bandwidth package with prepaid billing system. On the other hand, you can easily [...]
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How to Block Free Proxy Access with MikroTik Router | May 21, 2019
Proxy Server is an alternative to VPN that breaks blocking firewall of a network. If any user uses free web proxy server with web browser, the web request is processed by the proxy server. So, blocking firewall rule is not applied on the proxy enabled PC. For this, system administrators should be careful enough to block free proxy servers along with blocking VPN access. In my previous article, I discussed how to block VPN access with MikroTik Firewall. In 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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Linux Text Editor | September 7, 2017
Everything is file in Linux operating system. So, anyone who wants to work with Linux operating system (specially, Red Hat or CentOS) must learn how to edit files in Linux operating system. Because, it is always prefer to avoid graphical user interface (GUI) for changing system configuration parameters in Linux operating system unlike Windows operating system. You should be expert enough to edit any file in Red hat Linux operating system otherwise you will face a lot of difficulty to [...]
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MikroTik Load Balancing over Multiple Gateways (2 WAN) | October 13, 2016
Load Balancing is a technique used to send network traffic over multiple gateways. If you have multiple ISP connections in your network, you can send your network traffic through those ISP connections and can make a load balancing network. Accidently you may ask me, why will I use multiple ISP connections? What are the benefits to use multiple ISP connections in my network? I will say, ask yourself deeply then you will find the reasons why multiple ISP connections is [...]
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MikroTik VPN Configuration with Site-to-Site PPTP | February 19, 2018
VPN (Virtual Private Network) is a technology that provides a secure and encrypted tunnel across a public network and using this VPN tunnel a private network user can send and receive data to any remote private network as if his/her network device was directly connected to that private network. MikroTik PPTP is a popular client-server VPN service that provides a secure and encrypted link across public network. MikroTik PPTP can be applied in two methods. Connecting remote workstation/client: In this [...]
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How to Assign VMware ESXi License Key | December 4, 2021
No doubt VMware is the pioneer in virtualization world. VMware can be used either premium or free based on licensing. In the previous article, I discussed how to install VMware ESXi on a physical server or machine and then I also discussed how to get VMware ESXi free license from VMware website. Getting VMware ESXi license key either premium or free, we may sometimes get confused how to assign the license key in VMware ESXi host. So, in this article [...]
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