Posted in DNS attacks Network

What is DNS tunneling?

Do you know how dangerous and damaging DNS tunneling could be for your organization? If not, no worries. In this article, we will explain that. In addition, we will give you more information about its purpose, how it functions, and the prevention methods. So, let’s not waste any more time and get into business.

Meaning of DNS tunneling

DNS tunneling is a malicious and complex attack. Its purpose is to send DNS requests to the attacker’s server, giving the attackers a covert conduit for command and control and a route for data espionage. The cybercriminals breach the target DNS server and remotely take over management using data payloads.

How does it function?

For internal employees to access external websites and outside users to locate their websites, businesses permit DNS traffic to get across their firewall. This characteristic is exploited by DNS tunneling, which uses DNS requests to set up a command and control channel for malware. Outbound DNS traffic can exfiltrate sensitive data or deliver answers to the malware operator’s requests, whereas inbound DNS traffic might transmit commands to the malware. Because DNS is a fairly adaptable protocol, this works. Because DNS requests are made to seek website domain names, there aren’t many constraints on the information they can contain. These fields can be used to carry sensitive information because nearly anything can be used as a domain name. These queries are intended to be sent to DNS servers under the attacker’s control, enabling them to accept the requests and provide the necessary DNS answers.

To sum up the process in three steps, it looks lite this:

  1. First, hackers control a domain that links to a server that has malware running on it.
  2. The hacker uses a server that has been compromised with malware to look for the attacker-controlled domain.
  3. The DNS resolver creates a tunnel between the attacker and their target as it routes the query, enabling them to gather information, take over the server remotely, or carry out other attacks.

Ways to protect your organization against DNS tunneling

Is defense against DNS tunneling attacks possible? Yes, it is the answer. How? We’ll examine the two primary approaches.

  1. The first step is to put a firewall system in place. This may be the best method of protection against the DNS tunneling assault. Why? Because all unwanted communications can be instantly detected and stopped using this technology.
  2. The second is to keep an eye on DNS traffic (DNS Monitoring). This is another clever tactic. Why? Because you’ll be able to keep an eye on DNS traffic and be informed of any activity that could be detrimental. This can help you lessen the risks connected with DNS tunneling.


Since DNS was originally designed for name resolution rather than data communication, it is frequently overlooked as a threat to malicious information exchange and data exfiltration. Because DNS is a well-established and trusted protocol, attackers know businesses rarely check DNS packets for malicious activity. As a result, DNS is less important, and most enterprises focus their resources on slicing up web or email traffic because that’s where they think attacks frequently happen. DNS tunneling must be generally found and prevented through continuous endpoint monitoring.

Posted in DNS servers

Private DNS server: Definition & Benefits

You’re looking up what a Private DNS server is on the internet? If so, you’ve come to the right place. This article will look at its primary function, why it is so essential to implement, and how you can use it on your device. So, let us begin this adventure.

Private DNS server: Definition

As the name may suggest you, a Private DNS server seems to be something personal. It functions as the interaction between your network and the Domain Name System server, preventing third parties data from being intercepted. They’re DNS networks that aren’t connected to the Public DNS. Consider it a personal library with a select group of books. This has both downsides and benefits. Yes, you will not be able to read a particular genre of book. However, there is one advantage: no one will know what you are reading because your library is private.

In addition, we refer to Private as either DNS over TLS (Transport Layer Security) or DNS over HTTPS (Hypertext Transfer Protocol Secure). This is because all DNS queries are encrypted when you use DoT (DNS over TLS) or DoH (DNS over HTTPS). This makes it much harder for suspicious third parties to snoop on your web traffic.

Why is it beneficial?

A Private DNS server provides numerous advantages. We will simply look at one of them. Here are some of them:

  • It ensures your safety! This is arguably the most crucial advantage of the Private DNS server. Every Website address you write, as well as every searching request you make, are let go in plain text when you utilize conventional DNS servers. In other words, anyone with the necessary knowledge may monitor your activities through your computer browser. That means, if you use a Public DNS server, you may be more vulnerable to DoS and DDoS attacks. This is exceedingly unlikely to happen if you use a Private Domain Name System server.
  • Almost all Premium services are available. Yes, so many premium services are accessible on the Private Domain Name System server. It might, for example, feature Secondary DNS and Dynamic DNS.
  • Additional DNS zones and records. Your server will be able to host as many DNS zones and DNS records as it can. Such that you will have access to all DNS records you require (A, AAA, SOA, PTR, MX, TXT, CNAME, etc.).

How can you apply a Private DNS server?

It’s not difficult to set up your own Private DNS server. However, depending on your device, the procedure changes (computer, smartphone, Operating System, etc.). To summarize, you must configure a DNS address on your device to enable Private DNS. Moreover, having direct links to a 3rd DNS server that offers DoT or DoH features would be ideal.


To summarize, a Private DNS server is both necessary and advantageous for you and your company. It provides additional protection than the ordinary Public DNS server. Furthermore, depending on the device or Operating System(OS) that you are using, it is really straightforward to apply. So don’t wait any longer and make use of this fantastic DNS server. Best of luck!