dns server configuration in rhel 7
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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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Port Based Apache Virtual Hosting on RHEL 7 | July 26, 2019
Virtual Hosting is a method of hosting multiple domains on single web server. If you have multiple domains (such as domain1.com, domain2.com and so on) and want to host on single web server, Virtual Hosting is your right choice. Apache web server provides an easy way to manage Virtual Hosting. Virtual Hosting can be Name Based, IP Based or Port Based. In Name Based Virtual Hosting, multiple domains can be hosted on single Server and single IP address. On the [...]
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Enable F8 Menu to Enter Safe Mode in Windows 8 & 10 | August 27, 2015
Windows is the most popular operating system in the world. No computer user can go a single day without windows operating system. As windows is a popular operating system, it has a lot of viruses also. But windows provides various tools for removing these viruses. For removing any unwanted program, windows safe mode is a best option. A popular way to open windows safe mode is windows Advanced Boot Options. Advanced Boot Options provides different run levels for windows users so [...]
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MikroTik WiFi MAC Authentication with UserMan RADIUS Server | December 23, 2019
MikroTik Wireless Router is popularly used as WiFi AP. MikroTik WiFi AP has a lot of features to tune WiFi network as your requirements. MAC authentication is one the amazing and useful features in MikroTik WiFi. MAC authentication enables filtering MAC address that means no MAC can be able to connect to WiFi AP without authentication. MAC authentication can be done either local database or RADIUS Server. MAC authentication with RADIUS Server provides facility to manage multiple APs from centralized [...]
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How to Mount USB Device in CentOS 7 (NTFS and Linux FS) | February 18, 2019
USB Hard Disk Drive or USB Flash Drive (Pen drive) is a popular external device that can be used to backup data or transfer data from one device to other device. In GUI (Graphical User Interface) Operating System such as Window or GNOME Desktop in Linux can automatically mount USB device and can show data in it if the File System of that device is supported. But all users do not like or always do not have GUI mode of [...]
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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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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 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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FreeRADIUS Installation and Basic Configuration on CentOS 7 | November 28, 2018
FreeRADIUS is a modular, high performance and highly customizable open source RADIUS server. Anyone can use FreeRADIUS without any charge and can customize his RADIUS server according to his organizational requirements. In my previous article, I discussed how to install and configure user manager RADIUS server developed by MikroTik. The main disadvantage of user manager RADIUS server is ‘it is not customizable and not suitable for medium or large organization’. On the other hand, FreeRADIUS is giving facility to customize [...]
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MikroTik Hotspot HTTPS Redirect with Free SSL Certificate | June 21, 2020
SSL Certificate is required to enable HTTPS Login and HTTPS Redirect in MikroTik Hotspot. In one of my last articles I discussed how to configure MikroTik Hotspot HTTPS redirect and HTTPS login with MikroTik self-signed certificate. But self-signed certificate is not trusted by operating system. So, we get the following two issues if we configure HTTPS Login and HTTPS Redirect with self-signed certificate. Ask to proceed unsafe site: As browsers cannot trust self-signed certificate, it shows a warning message and [...]
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