DNS Filtering: What it is and How it Works

DNS filtering, also known as DNS blocking, emerges as a robust security technique designed to safeguard users from malicious, untrustworthy, or undesirable online entities. In this article, we will dive into this topic and explore how it works to fortify your digital environment. So, without further ado, let’s begin!

Understanding DNS Filtering

DNS filtering operates as a proactive defence mechanism, acting as a gatekeeper between users and the vast expanse of the internet. At its core, DNS (Domain Name System) filtering examines and controls the translation of user-friendly domain names into IP addresses, thereby determining whether a user can access a specific website or online resource.

How DNS Filtering Works?

Let’s break it down into several steps:

  1. User Initiates a DNS Query: The process starts when a user attempts to access a web address. This triggers a DNS query, wherein the user’s device requests the corresponding IP address (IPv4 or IPv6) of the desired domain from the DNS server.
  2. Comparison with Blocklist: Simultaneously, the DNS query is scrutinized against a predefined blocklist containing domains or IP addresses identified as malicious, untrustworthy, or undesirable. This blocklist is carefully selected to encompass potential threats, phishing sites, or content that violates organizational policies.
  3. Match Detection: If the DNS query corresponds to an entry on the blocklist, a match is detected. This signals that the queried domain is considered unsafe or undesirable.
  4. Domain Resolution Denial: In the event of a match, the DNS server refrains from resolving the domain to its corresponding IP address. As a result, the user’s request is blocked, and access to the flagged domain is denied.

Benefits of DNS Filtering

Here are some of the main reasons and advantages of using this technique:

  • Enhanced Security: DNS filtering acts as a first line of defence against cyber threats, blocking access to domains associated with malware, phishing, and other malicious activities.
  • Content Control: Organizations can regulate and control the type of content accessible to their users, ensuring compliance with company policies and mitigating the risk of exposure to inappropriate or harmful material.
  • Productivity Boost: By preventing access to non-business-related or distracting websites, this technique aids in improving employee productivity and focus during working hours.
  • Data Loss Prevention: It helps prevent data exfiltration attempts by blocking access to domains associated with unauthorized file transfers or communication channels.


DNS filtering emerges as a great tool in fortifying online security. By carefully evaluating DNS queries against a blocklist of undesirable domains, this technique provides organizations and individuals alike with a powerful means to control access to the internet, safeguard sensitive information, and maintain a secure digital environment. Embracing DNS filtering is not just a precaution but a proactive step towards a safer and more secure online experience.

DNS Delegation: Everything You Need to Know

DNS delegation stands out as a fundamental mechanism that empowers the internet to function smoothly. In this article, we will unravel the layers of this process, exploring its significance and the role it plays in ensuring a robust online experience.

Understanding DNS Delegation

DNS (Domain Name System) delegation is a process that involves distributing authority and responsibility for domain names across multiple DNS servers. This hierarchical structure is designed to efficiently manage the translation of human-readable domain names into machine-readable IP addresses. At the core of delegation is the notion of dividing the DNS namespace into smaller, manageable zones.

Zones and Delegation

In the world of DNS, a zone is a portion of the domain namespace that is managed by a specific DNS server. This server is responsible for maintaining the authoritative information for that zone. DNS delegation occurs when authority for a subdomain is assigned to a different set of DNS servers than those responsible for the parent domain.

Imagine a scenario where a company’s main domain is “example.com.” Within this domain, the company may have various services like “blog.example.com” and “shop.example.com.” To efficiently manage these subdomains, DNS delegation takes place. The DNS authority for each subdomain is delegated to specific DNS servers, allowing for decentralized control and streamlined management.

The Delegation Process

Let’s break the process into several steps:

  1. Parent Domain Configuration: The process begins with the owner of the parent domain configuring the authoritative DNS servers for the domain. These servers hold the master records for the domain and its subdomains.
  2. Subdomain Delegation: Once the parent domain is configured, the owner can delegate authority for specific subdomains to other DNS servers. This involves creating NS (Name Server) records that point to the authoritative DNS servers for the subdomain.
  3. Authority Transfer: The delegated DNS servers assume authority for the delegated subdomain, allowing them to respond to DNS queries for that specific zone. This distributed approach ensures efficient management and scalability, as different teams or organizations can be responsible for distinct subdomains.

Benefits of DNS Delegation

Some of the main advantages include the following:

  • Improved Performance: By distributing authority, it enhances the performance of the DNS system. Queries are directed to specific authoritative servers, reducing the load on a single server and minimizing latency.
  • Scalability: As organizations grow and expand their online presence, DNS delegation allows for the delegation of authority to different teams or departments, facilitating efficient management of diverse services and subdomains.
  • Fault Isolation: In the event of server failures or issues, this mechanism ensures fault isolation. Problems in one subdomain do not impact the entire domain, promoting resilience and reliability.


In the intricate web of the internet, DNS delegation stands as a cornerstone of efficient domain management. By distributing authority and responsibility, it not only ensures a smooth online experience but also lays the foundation for scalability and fault tolerance. As technology continues to evolve, understanding the nuances of this mechanism remains essential for organizations seeking to build and maintain a robust online presence.

DNS Failover: How It Works and Why Your Website Needs It

The Domain Name System (DNS) is a critical internet component. It translates human-readable domain names into machine-readable IP addresses that identify the location of websites and other resources. But what happens when the server that hosts your website goes down or there’s a network outage that prevents users from accessing your site? This is where DNS Failover comes in. In this blog post, we’ll explore what it is, how it works, and why your website needs it.

What is DNS Failover?

DNS Failover involves a process in which traffic is redirected from an unavailable server to an available one. It’s a mechanism that ensures your website remains accessible even when your primary server is offline. When your primary server becomes unavailable, it automatically directs traffic to a backup server that can serve as a substitute. This process is seamless and invisible to users, ensuring uninterrupted access to your website.

How does DNS Failover work?

It works by using a monitoring system that checks the availability of your servers. When the monitoring system detects that the primary server is down, it automatically updates the DNS records to point to the backup server. This process is usually achieved using a DNS Failover service that manages the DNS records and monitors server availability. The failover service sends periodic checks to your servers to ensure they’re online and available to receive traffic. If the primary server fails to respond, the DNS Failover service will update the DNS records to redirect traffic to the backup server.

Suggested article: How to Configure DNS A Record?

Why do you need it?

If your website stands at the core of your business operations, you can’t afford to have downtime. Every minute of website downtime can lead to lost revenue, lost customers, and damage to your reputation. DNS Failover can help ensure your website remains available even during server outages, network problems, or other issues that can cause downtime. It provides an additional layer of redundancy and ensures that your website is always up and running.


DNS failover provides several benefits that can help ensure the availability of your website, including:

  • Increased Uptime: It can significantly increase your website’s uptime by redirecting traffic to a backup server during an outage.
  • Improved User Experience: With DNS failover, your website remains accessible to users, even during downtime, which can help improve the user experience.
  • Better Business Continuity: By ensuring your website remains available, DNS failover can help ensure business continuity, minimizing the impact of outages on your operations.
  • Cost Savings: It can help you avoid costly downtime, which can result in lost revenue and damage to your reputation.


DNS failover is a critical component of website availability and uptime. By automatically redirecting traffic to a backup server during outages, it ensures that your website remains accessible to users, improving the user experience and minimizing the impact of downtime on your business operations. With its ability to increase uptime, improve user experience, and provide better business continuity, it is an essential tool for any business that relies on its website for its operations.

DNS outage – What is it and why is it important to avoid it?

In today’s world, where nearly everything is online, the importance of website availability and accessibility cannot be overstated. However, these factors of a website depend heavily on the Domain Name System (DNS). Therefore, if the DNS service goes down or experiences an outage, it can lead to significant disruptions, affecting both businesses and individuals. In this blog post, we will explore what DNS outage is, what causes it, and why it’s important to avoid it. So, without any further ado, let’s start!

What is a DNS outage?

A DNS outage or Domain Name System outage/downtime appears when the DNS service responsible for translating domain names into IP addresses becomes unavailable. Every time a user writes in a domain name in their browser, the browser sends a request to the DNS server to translate that domain name into its corresponding IP address, which the server then sends back to the browser. If the DNS service is unavailable or experiences an outage, the browser cannot get the IP address, and the website becomes unreachable.

What causes a DNS outage?

There are several reasons why DNS outages can occur, including:

  • Cyber Attacks: DNS servers often are a target of cyber-attacks like DDoS (Distributed Denial of Service) attacks, which can overwhelm the server and cause it to crash.
  • Configuration Errors: Misconfiguration of DNS servers or incorrect DNS entries can cause the DNS service to fail.
  • Hardware and Software Failures: DNS servers, like any other hardware or software, can experience failures that can cause the service to go down.

Why is it important to avoid it?

Being unavailable during a DNS outage can have a significant negative impact. Here are some of the reasons why you should avoid it:

  • Loss of Revenue: If a website is down due to a DNS outage, it can lead to a loss of revenue for businesses. E-commerce websites, for instance, heavily rely on their online presence, and any downtime can translate into lost sales.
  • Damage to Reputation: A website’s availability and accessibility are critical to its reputation. If a website experiences frequent outages, it can damage its reputation, leading to a loss of clients and revenue.
  • Security Risks: It can also lead to security risks, as cyber attackers can take advantage of the downtime to launch attacks on the website.

How to avoid a DNS outage?

Some important techniques to avoid DNS outages are the following: 

  • Use Multiple DNS Providers: One way to prevent a DNS outage is to use one Primary DNS provider and one Secondary DNS provider. If the primary goes down, the other can take over, ensuring continuity of service.
  • Regular Maintenance: Regular maintenance of DNS servers can help identify and fix any configuration errors and hardware or software failures before they cause an outage.
  • GeoDNS: By providing redundant, geographically distributed nameservers, GeoDNS ensures that traffic is appropriately routed during an outage.
  • Monitor DNS Performance: Monitoring the performance of DNS servers can help identify any issues before they escalate into a full-blown outage.
  • Load balancing: Implementing a load balancing technique is going to help distribute the incoming traffic through several DNS servers, which will help prevent any downtime.
  • Anycast DNS: Anycast DNS replicates DNS content across multiple different data centers so traffic can always be routed to an available name server, preventing an outage.


In conclusion, DNS outages can have significant consequences on businesses and individuals, leading to loss of revenue, reputation damage, and security risks. It’s, therefore, essential to understand what it is, what causes it, and how to avoid it. By using multiple DNS providers, regular maintenance, and monitoring, businesses can ensure continuity of service, protect their reputation, and prevent security risks.

3 Reasons why you should you invest in Anycast DNS

If you’re looking for a reliable, cost-effective way to manage your website’s DNS queries, Anycast DNS is the perfect solution. With its multiple servers placed in different geographical locations, it ensures lightning-fast responses, improved performance, and greater redundancy to keep your website running smoothly.

What does Anycast Domain Name System (DNS) mean?

Anycast DNS is a method of delivering data across multiple servers in different geographic locations. This system ensures uninterrupted service in the event of a server failure or if the server is extremely busy. This Anycasting method is particularly useful for websites with many global visitors, as it improves the speed of lookup requests by providing DNS services from several sources instead of just one. By sending requests to the server closest to a requestor’s location, Anycast Domain Name System reduces the time for lookup queries to be completed and reduces latency. This DNS service also helps prevent malicious attacks, as it is spread across multiple servers and locations.

Let’s now explore in detail Anycast DNS benefits.

Reason 1: Anycast DNS can improve website performance

Anycast DNS allows a website to improve its performance, as the DNS queries are spread across more than one server and location. With this improved performance, the requests are processed more quickly, so website visitors experience faster load times and lower latency. This can result in a better user experience, as visitors won’t have to wait as long for pages to load. Furthermore, the improved performance also improves a website’s ranking in search engine results, as slow page load times can negatively affect its position.

Reason 2: Anycast DNS offers greater redundancy and reliability

Anycast DNS offers greater redundancy and reliability, using multiple servers to deliver requests. This means that if one server fails or becomes overwhelmed with requests, another server on the Anycast network will be able to handle the request. This ensures that the request is resolved quickly and that the website remains available at all times. Additionally, If a server is attacked, the other servers on the network are not affected, making it a more secure solution compared to a single-server solution (Unicast DNS). Again, this ensures that a website remains available and secure, even in an attack.

Reason 3: Anycast Domain Name System is cost-effective

Anycast DNS is a highly cost-effective solution, as it allows businesses to leverage the power of multiple servers without purchasing and maintaining additional hardware. As a result, companies can scale their services quickly, as they do not need to purchase additional hardware or infrastructure when their demand increases. Additionally, Anycasting method does not require expert technical knowledge to be set up or managed, making it a much lower-cost option than other solutions. As such, businesses can significantly reduce their costs by investing in Anycast Domain Name System, allowing them to invest more in other areas of their business.


Investing in Anycast DNS can offer many benefits, including improved website performance, redundancy and reliability, and cost-effectiveness. Whether running a large business or a small website, it can provide the support you need to ensure that your site remains available and secure.

GeoDNS – The most powerful solution for your network

If you are looking for a powerful solution for your network, consider GeoDNS – an innovative tool that helps improve performance, security, and scalability. It is a Geographical Domain Name System technology that reroutes website visitors based on their geographic location so they are served the most optimal content. In this blog post, we will explore the ins and outs of GeoDNS, its benefits, and common mistakes to avoid when configuring it. With the proper setup, it can be a significant asset in making your network run more efficiently and reliably. So read on to learn more about this revolutionary technology and all it offers!

Who can benefit from using Traffic Director (GeoDNS)?

What is GeoDNS? 

GeoDNS, or Geographical Domain Name System, is a powerful tool to improve network performance and reliability by redirecting website visitors based on their geographic location. By enabling it, network administrators can ensure their visitors are served content from the closest available server or data center. GeoDNS also includes other vital services, like load balancing, which allows administrators to distribute the load across multiple nodes to ensure users don’t experience delays. For international companies, this service allows direct traffic to the most optimal location for the best user experience. Additionally, it is often used to detect and block malicious traffic, helping to make networks more secure. All of this is accomplished in real-time, meaning website visitors receive the most relevant and up-to-date content with every visit.

Reasons why you should use GeoDNS 

GeoDNS can be an invaluable tool for organizations that want to improve the performance and security of their networks. Here are six reasons why it is worth the investment: 

  1. Increased performance – by providing visitors with the nearest server, GeoDNS ensures the fastest response time possible; 
  2. Cost savings – It can reduce bandwidth costs by serving up cached or locally stored content; 
  3. Improved user experience – quick response times and fewer outages increase customer satisfaction;
  4. Increased scalability – GeoDNS helps networks handle more users and traffic; 
  5. Enhanced security – This service allows administrators to detect and block malicious actors; 
  6. Maximized efficiency – since GeoDNS can detect visitors’ geographic locations, it enables organizations to make better decisions about the resources allocated to customers. With the right service, organizations have access to these powerful benefits.

What are the common mistakes when configuring it?

Configuring GeoDNS correctly is essential for gaining the most benefits from this powerful tool. Unfortunately, some common mistakes are made when configuring that can lead to issues down the road. To help ensure smooth setup and operation, here are two of the most common mistakes to avoid: 

First, not having enough IP addresses in the server pool. GeoDNS works by redirecting traffic to the closest available IP address, so it’s important to have enough IP addresses in the server pool to ensure visitors are served the right content.

Secondly, not tracking key performance indicators. GeoDNS provides a great opportunity to track the performance of different nodes and locations, which can be helpful when making decisions on where to allocate resources. Without monitoring these KPIs, network administrators don’t have the necessary data to make informed decisions when configuring GeoDNS. By taking these steps, organizations can ensure that GeoDNS is optimally set up and running.


GeoDNS is a powerful tool that can help businesses run their networks more efficiently and securely. It ensures fast response times and higher user satisfaction by routing users to the closest available server. Additionally, Geographical Domain Name System can be used to detect and block malicious traffic, helping to make networks more secure. With the right configuration, an effective GeoDNS service can be a major asset in ensuring optimal performance and reliability across your network. So, if you want to take your network to the next level, this service is your solution.