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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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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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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MikroTik VRRP Configuration with DHCP Server | October 22, 2018
MikroTik VRRP (Virtual Router Redundancy Protocol) ensures high available internet network. If any organization requires uninterrupted internet connection, MikroTik VRRP implementation will be a vital solution for them. MikroTik VRRP creates a virtual router accumulating two or more physical routers and ensures uninterrupted internet connection keeping activate one physical router always. That means, if any physical router fails to operate due to any hardware failure, MikroTik VRRP uses another backup router for internet gateway until the running router comes back [...]
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MikroTik Unequal Dual WAN Load Balancing with Failover using ECMP | September 15, 2019
MikroTik Router is capable of doing Load Balancing with Failover over multiple gateways. Policy Based Routing, ECMP, PCC and NTH Load Balancing are the popular load balancing methods in MikroTik Router. Among these methods, ECMP is so easy to configure and provides almost 100% load balancing and link redundancy solution. In my previous article, I discussed how to configure Load Balancing and Link Redundancy using ECMP over two equal bandwidth gateways. ECMP method is also capable of doing load balancing [...]
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How to Buy a Good WiFi Router for Home or Office | October 12, 2021
You are here because you want to buy a WiFi Router and want to know how to buy a good WiFi Router for your home or office or business. A lot of wireless routers are nowadays available in the market. But before buying a WiFi Router, you should know which one is a good WiFi Router for your need based on some features and specifications of the router. We will now see some key points those should have well understand [...]
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How to Get Free SSL Certificate from ZeroSSL | June 13, 2020
SSL/TLS certificate is an essential part in today internet communication. Online communication cannot imagine without SSL/TLS certificate. SSL/TLS certificate makes online communication secure by encrypting data transmitted over public internet. So, most of the applications (Web, Email and VPN services) those transmit data over public internet use SSL/TLS certificate to secure communication. SSL/TLS certificate requires to be signed by Certificate Authority (CA). It is possible to create self-signed certificate with SSL certificate creation tools such as OpenSSL. Some router venders [...]
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MikroTik VRRP Configuration with Load Sharing | November 19, 2018
MikroTik VRRP (Virtual Router Redundancy Protocol) ensures high availability internet network. If any organization requires uninterrupted internet connection, MikroTik VRRP implementation will be a vital solution for them. MikroTik VRRP creates a virtual router accumulating two or more physical routers and ensures uninterrupted internet connection keeping activate one physical router always. That means, if any physical router fails to operate due to any hardware failure, MikroTik VRRP uses another backup router for internet gateway until the running router comes back [...]
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MikroTik Site to Site GRE Tunnel Configuration with IPsec | March 26, 2018
VPN (Virtual Private Network) is a technology that provides a secure tunnel across a public network. A private network user can send and receive data to any remote private network using VPN Tunnel as if his/her network device was directly connected to that private network. MikroTik provides GRE (Generic Routing Encapsulation) tunnel that is used to create a site to site VPN tunnel. GRE tunneling protocol which can encapsulate a wide variety of protocols creating a virtual point-to-point link was [...]
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Red Hat/CentOS Network Configuration | August 4, 2017
Red Hat/CentOS network configuration or IP configuration is an important task to a Linux system administrator. After completing RedHat 7/ CentOS 7 fresh installation, you have to first configure your system network so that it can communicate to other network devices. In my previous article, I discussed how to install CentOS 7 core packages successfully on your physical machine. If you are a new CentOS 7 user and yet you have not installed CentOS on your machine, feel free to study [...]
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