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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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Create System Restore Point in Windows OS | August 27, 2015
System Restore utility in windows operating system helps a windows user to take one or more snapshots of his/her windows system when windows operating system is working well. If any system crash occurs in future due to virus attack or critical system update or any unwanted program, the system can be reverted to its previous snapshot when windows OS was working well. So, System Restore utility in windows operating system is a very helpful service for windows users to protect [...]
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Block Internet Access at a Certain Time in MikroTik RouterOS | August 1, 2024
We often find how to block or allow internet access at a certain time in our LAN network specially in WiFi network. Time based internet access is so useful for controlling Kids internet in any family or managing stuff internet accessibility in any office or other network. MikroTik RouterOS offers a feature named Kid Control to block internet access at a certain time. This feature is so useful for the parents or network engineers who want to block internet access [...]
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Web Server Configuration in Linux with Apache, MariaDB and PHP | January 2, 2018
Web Server is one of the most important and most used servers today. Without web server internet cannot imagine. Even, the article you are reading is also served by a web server. So, having web server configuration knowledge is beneficial for you, I think. A web server is responsible to serve HTTP (Hypertext Transfer Protocol) contents such as text, image, audio, video etc. to its clients. A lot of web servers are present today such as Apache, IIS, Nginx and [...]
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5 Factors That Affect the VPN Speed | July 6, 2021
So you have finally decided to use VPN services. While it’s a great option you must have your concerns. One of these must be the VPN slowing down at times. If that’s the case then it’s better to know the reasons and to explore the issue prior buying or using a free VPN service. Whether you own a fashion brand or a company that teaches coding to beginner kids, many companies use VPN to provide its employees with a closer [...]
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Mikrotik Router Basic Configuration Using Winbox | August 24, 2015
MikroTik is one of the most popular routers. MikroTik Router has a lot of networking services that help to build a stable and smooth network so easily. It is said that any ISP Company or any Enterprise Office cannot go a single day without MikroTik Router. So, system administrators who are not using MikroTik Router yet, they will soon start using MikroTik Router, I think. As a system administrator, I am also using MikroTik Router about 5 years in my network [...]
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LVM Management in CentOS/Red Hat 7 Linux | March 15, 2019
LVM (Logical Volume Manager) is the recommended partition method for CentOS/Red Hat 7 Linux. Specially, if we work on Mail Server, File Server, FTP Server, Web Proxy Server or any application where disk space changes frequently, the LVM partition is mandatory in this case. In my previous article, I discussed how to install CentOS 7.5 with LVM partitioning. If you are new here or CentOS 7 is not yet installed, I will suggest you to follow my previous article and [...]
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FreeRADIUS User Profile Configuration for MikroTik Router | January 10, 2019
FreeRADIUS is a high performance RADIUS application that accepts a large number of network devices as RADIUS Client including MikroTik Router. FreeRADIUS MySQL module helps to get user authentication and authorization information from database server and to store user accounting information in database server. Configuring MySQL user group and profile properly, freeRADIUS user restriction can easily be maintained. How to configure user group to apply user limitation was discussed in my previous article. In this article, I will discuss how [...]
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MikroTik User Management (RouterOS User) | October 22, 2017
MikroTik User Management plays an important role in MikroTik system administration as well as MikroTik security. Don’t be confused the title User Management with the MikroTik UserManager. UserManager is an optional and totally separate package distributed by MikroTik. UserManager is an implementation of Radius server that is used to maintain not only RouterOS users but also PPPoE, PPTP, Hotspot, Wireless and DHCP users. In my few future articles, I will discuss how to maintain these users with MikroTik UserManager Radius [...]
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MikroTik Hotspot Customized Login Template | April 14, 2022
MikroTik Hotspot is a popular service which is used to manage ISP, Hotel, Restaurant, Airport, and Public WiFi. Using billing application like GalaxyRAD with MikroTik Hotspot, a WiFi network can manage professionally. MikroTik Hotspot loads a login page for new user authentication. So, this login page is a vital source for promoting your brands. The default login template provided by MikroTik Hotspot is a simple template which cannot fulfill branding requirements. But it is possible to customize the login template [...]
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