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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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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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How to Install Extra Packages in MikroTik RouterOS | October 10, 2019
MikroTik RouterOS does not always include all the packages those are developed by MikroTik team. So, sometimes you may find that some packages are missing in your RouterOS such as NTP package, DUDE package, Wireless package, CAPsMAN package and so on. Specially, user manager package which is totally a separate MikroTik RADIUS package used to manage user authentication, authorization and accounting is always missing. Also upgrading RouterOS or downgrading RouterOS you may find that some packages are missing there. So, [...]
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7 Best WiFi Router Brands For Home Or Apartment | September 18, 2021
So, you are deciding to buy a WiFi Router for your home or apartment and finding which brand will be the best WiFi Router for your home. A lot of brands which manufacture WiFi Router for home usage are available nowadays in the market but all brands are not renowned and don’t provide best performance for home usage. So, before going to buy a WiFi Router, you should have better understanding about Best WiFi Router Brand that provides best WiFi [...]
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Getting Started with Red Hat Linux | May 20, 2017
Red Hat Linux is an open source server operating system. Although open source Red Hat is a commercial Linux distribution. So, most of the Linux administrators use CentOS because CentOS is a free and open source, enterprise-class and community-supported server platform as well as it is functionally compatible with Red Hat Enterprise Linux. In my previous article, I showed how to install CentOS 7 core packages in your server machine. Today I will introduce you with Red Hat Linux’s command [...]
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MikroTik WiFi Frequency Band and Channel Width Explanation | January 10, 2020
MikroTik WiFi frequency, band and channel width tuning is an important task in any wireless network. If we fail to setup WiFi frequency and channel width parameter properly, we will notice a poor performance of wireless network. WiFi is aimed at use within unlicensed spectrum and the unlicensed spectrum that is usually used for WiFi is 2.4 GHz and 5 GHz band. 2.4 GHz and 5 GHz bands have multiple channels and these channels must be setup properly to get [...]
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CAPsMAN Channel Planning with Non-Overlapping Frequency | March 16, 2020
MikroTik CAPsMAN is an excellent application for managing multiple CAPs (Controlled Access Point) in a Wireless Network. But multiple APs create frequency overlapping issue if channels are not configured properly. Channel overlapping is required for smooth connection while roaming but there should not be frequency overlapping because frequency overlapping makes wireless performance so poor. In my previous article, I discussed MikroTik CAPsMAN basic configuration with default channel configuration. In this article, I will discuss how to configure CAPsMAN channel to [...]
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MikroTik Site to Site SSTP VPN Setup with RouterOS Client | May 14, 2020
VPN (Virtual Private Network) technology provides a secure and encrypted tunnel across a public network. So, a private network user can send and receive data to any remote private network through VPN tunnel as if his/her network device was directly connected to that private network. Secure Socket Tunneling Protocol (SSTP) transports PPP tunnel over TLS channel. SSTP uses TLS channel over TCP port 443. So, SSTP VPN can virtually pass through all firewalls and proxy servers. Because of using TLS [...]
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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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Why ISPs Should Embrace TR-069 ACS to Stay Ahead of Competitors | May 22, 2023
As the telecommunications industry becomes more competitive, local ISPs need to find ways to stay ahead of larger telcos and offer services that meet the changing demands of their customers. One of the solutions to this challenge is to implement TR-069 ACS server to help streamline network management, reduce costs, and increase efficiency. In this article, we’ll explore why the TR-069 ACS server is essential for medium-sized ISPs to stay competitive in today’s market. We’ll examine the challenges these ISPs [...]
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