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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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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MikroTik Configuration with PPPoE WAN Connection | July 18, 2018
MikroTik Router is a popular routing device to any network administrator because of having a lot of network features availability. MikroTik PPPoE Client is a special feature that is used to connect any PPPoE Server. If your ISP provides PPPoE connection, MikroTik Router is able to connect that PPPoE Server using PPPoE Client. In my previous article, I discussed how to configure MikroTik Router with static WAN connection and in this article I will show how to configure MikroTik Router [...]
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CentOS 7 Network Configuration Using nmtui Tool | August 27, 2018
After completing CentOS 7 fresh installation, the first task to a system administrator is to configure its network so that it can communicate to other network devices. In my previous article, I discussed how to install CentOS 7.5 GUI (GNOME Desktop) step by step. If you are a new CentOS 7 user and yet you have not installed CentOS 7.5 on your server machine, feel free to study my previous article and install CentOS 7.5 GNOME Desktop according to that [...]
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MikroTik Blocking Websites with TLS Host Firewall Matcher | April 29, 2019
Most of the websites now use https and blocking https websites is so much harder with the MikroTik RouterOS version less than 6.41. But from RouterOS v6.41, MikroTik Firewall introduces a new property named TLS Host that is capable to match https websites so easily. So, blocking https websites like Facebook, YouTube etc. can be easily done with MikroTik Router if RouterOS version is greater than 6.41. In my previous article, I discussed how to block websites with MikroTik Router [...]
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MikroTik HotSpot One to One NAT/Universal HotSpot NAT | September 27, 2020
MikroTik Hotspot is an awesome service that can be customized widely. When MikroTik Hotspot is enabled on an interface, it adds dynamic destination NAT rules which will redirect all HTTP and HTTPS requests from unauthorized users to the Hotspot authentication proxy. So, no user can get internet access in Hotspot network without authentication. MikroTik Hotspot also uses one to one NAT providing an IP address from selected IP Pool and this IP address handles user’s data and limitation. Sometimes we [...]
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Securing MikroTik Router with Port Knocking | March 21, 2021
MikroTik Port Knocking strategy helps to protect MikroTik Router from hackers and unauthorized access as well as enhances MikroTik RouterOS security.
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MikroTik User Manager RADIUS Installation on RouterOS 7 | July 5, 2022
The User Manager is a MikroTik provided RADIUS Server packages. It can be used to manage users for small or medium level business. User Manger is not a default RouterOS packages. So, we have to install user manager as an extra package in RouterOS 7. RouterOS 7 has brought a massive change on User Manager package. The most important change is managing User Manager from Winbox while in RouterOS 6 the User Manager package can only be managed from Web [...]
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MikroTik Send Browsing Log to Remote Syslog Server | August 18, 2019
MikroTik RouterOS is capable of logging various system events as well as user browsing information. Logs can be saved in router’s memory (RAM), disk, file, sent by email or even sent to remote syslog server. Sometimes it may require saving user browsing log by the law. So, a syslog server is an essential part to any network. In this article, I will discuss how to configure MikroTik Router to keep user browsing log and send that log to remote syslog [...]
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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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