DNS outage – What is it?

Have you ever heard about a DNS outage? If the answer is no, no worries. You are in the right place. In this article, we will take place at what it purpose is, what can cause it, and how you protect against it.

DNS outage – definition

A DNS outage, also known as DNS downtime, occurs when the DNS fails to work correctly for an extended period of time. This means that you won’t find the IP address if you look for the domain name. Users will instead perform DNS requests to visit your domain. The DNS recursive server will request the domain’s authoritative nameserver, but it will receive an error message as a response.

Factors that cause a DNS outage

We can agree that the DNS outage is a really troublesome moment. However, it can be caused by different things, one of which are:

  • An occurrence in the data center (the site of the authoritative name server). The “cloud” is located in a data center or multiple data centers, not in the sky. And while such locations are safe, they are not foolproof. Especially when it comes to natural disasters, power outages, and other issues. Several things can cause your authoritative name server to go offline.
  • The upkeep of authoritative name servers. Updates or reboots are occasionally required as part of routine maintenance. This disables the server’s ability to respond to DNS requests.
  • Denial-of-Service and Distributed Denial-of-Service attacks. DoS and DDoS assaults aim to cause a denial of service. You will experience a DNS outage if they succeed.
  • Configuration errors. DNS outages can be caused by a variety of human errors when configuring DNS. Script errors, incorrectly typed IP address, firewall configuration issues, etc.

How can you prevent it?

There are different ways to protect you against DNS outage. Here are some of them:

  1. Load balancing service. Having a lot of traffic might be a double-edged sword. They could result from hard labor or indicate a DoS or DDoS attack in the process. In addition, DNS load balancing is an effective way to spread traffic across all of a network’s servers. You can avoid overloading individual servers, deal with traffic spikes, and handle excessive traffic in general.
  2. DDoS protection service. Advanced and continuous monitoring, firewalls, software, hardware, and DDoS deflation to absorb the attack, among other things.
  3. Secondary DNS service. You already have a DNS service provider (Primary DNS). You could hire a separate provider and set them up as Secondary nameservers using their various Secondary DNS servers. A copy of the zone file and DNS records will be stored on these servers. As a result, they’ll be able to reply to DNS requests the same way as Primary DNS does. You’ll have a backup in case the final one goes down.
  4. Monitoring service. The only way to know traffic like the back of your hand is to monitor it continually. You can distinguish between typical and abnormal traffic this way. You can take action based on traffic behavior to avert an attack or deal with a regular spike in traffic. Current solutions allow you to monitor specific places in real-time to identify whether the problem is local, regional, global, and so on.

Conclusion

Now you are familiar with the DNS outage and its consequences. Don’t let it hitch a ride on your system, but take preventive measures to protect yourself.

3 popular DNS attack types and how to prevent them? 

Computer hackers frequently use security gaps or unpatched weaknesses in the domain name system to launch DNS attack types. In this article, we will take a look at the most popular of them that you should be aware of and how to avoid them.

DDoS amplification attack

Let’s begin our DNS attack types list. The first one is DDoS amplification attacks. The goal of a DNS attack like this is to boost traffic to unmanageable levels. Due to the fact that UDP does not authenticate, cybercriminals send a DNS request to obtain the IP address as well as additional DNS information to ensure that the response is enormous.

Furthermore, attackers can change the requests for all of those enormous answers to go directly to the target, overwhelming it with information it didn’t ask for. The excruciating downtime will be the end outcome.

How to avoid this attack? An Anycast network can help since it contains a large number of DNS servers that can filter and manage fraudulent traffic. It can be screened without harming the network if the capacity is sufficient. 

DNS spoofing

The second most popular attack is DNS spoofing (also known as DNS poisoning). It is a relatively frequent DNS attack that includes the bad actor inserting changed DNS records into the cache memory of DNS resolvers. The IP address for the changed records is frequently different from the original name records. Visitors are led to the bad actor’s website. They can communicate sensitive information that could be exploited for a variety of illicit purposes, such as stealing money or stealing identities.

Often, the victims are completely unaware that there is an issue. Instead, they are led to a site that appears to be quite similar to what they were looking for.

It’s challenging to keep safe from such an attack because most people don’t double-check a domain’s IP address before utilizing it. However, we can protect ourselves by installing anti-virus software on our computers, avoiding suspicious links, and double-checking a website’s legitimacy before using our credit cards.

DNS tunneling

The last critical DNS attack is DNS Tunneling. It takes advantage of the DNS to encrypt (tunnel) malware and other information in DNS queries and responses (client-server way).

This is how it works in a nutshell. A criminal registers a domain and connects its name server to its own. A tunneling trojan software is installed in this last step. When a machine is infected, it sends a request to a DNS resolver server. Because DNS is allowed, DNS requests can freely pass across firewalls. The danger begins here. The resolver sends the request to the criminal’s server, and the criminal and the target establish a connection through the DNS resolution server. Because the connection between the target and the criminal is not direct, this hides and makes it challenging to identify the criminal’s computer.

How to prevent DNS Tunneling? Install a DNS effective firewall as the first line of defense to detect intrusions, odd DNS requests, answers, and patterns.

Conclusion

As you can see, DNS service is critical for keeping your websites and online services operational daily. However, it is constantly in danger. So, before it’s too late, take care of your DNS protection.

DDoS attack – Definition & Prevention

What is a DDoS attack?

The Distributed Denial of Service attack, more commonly known as a DDoS attack, is a serious cyber threat that cyber criminals often initiate to their victims. Through this cyber-attack, they overwhelm the server, system, or network of the victim. The DDoS attack involves numerous devices, also known as a botnet, that send massive amounts of fraudulent traffic to the target. Eventually, the victim gets flooded and unable to operate. 

It is called “distributed” exactly because there are numerous different sources of the attack pointing to the victim. At some point, the limit of resources is reached, and the target is down. The denial of service is completed, and regular users are not capable of reaching and connecting with it.

There are different types of DDoS attacks, and they could be initiated in different ways, yet the goal is always the same – to hit and bring down the target. Generally speaking, each DDoS attack is generated by infecting as many devices connected to a network as possible. Additionally, it could be started from any point in the world and direct massive traffic towards the target to flood it. The sources are compromised and typically are various IoT devices, servers, computers, etc. At first, the target gets sluggish until it drowns completely.

How to prevent a DDoS attack?

DDoS protection

With DDoS protected DNS service, you could strengthen your defense against these malicious attempts called DDoS attacks. It provides a collection of tools that could be very beneficial and ensure the availability of your network, website, or service. In addition, it is far less expensive rather than paying the after-effects of an attack.  

Monitor your traffic.

Usually, online businesses maintain particular traffic patterns. It will be best if you are able to acknowledge them. That way, if there is abnormal activity, you will be capable of distinguishing it. Additionally, with a monitoring service, you will recognize when something about your network is just not right. Thanks to the different types of checks that you could perform, you will know the details about your network and traffic. It is going to help you detect the first DDoS signs before it is too late.

Anycast DNS

Anycast DNS is able to spread the traffic through the entire network of DNS servers in case a DDoS attack is initiated. In addition, if one of the servers is down due to the DDoS attack, the rest of the servers are going to be still up and running. That means they will still answer requests to regular users. The configuration of Anycast DNS is based on several servers holding the same IP address. For that reason, the DNS query of a user is going to continue to search and skip servers that are non-responsive until one of them is available and can provide the answer.

Implement load balancing

It is a beneficial technique that distributes the incoming traffic in a way that prevents overstressing the servers in your network. Providers of quality services offer a great robust network that is perfect for load balancing. That means it is a great opportunity for organizations with big traffic loads. Without a doubt, it is a major advantage when it comes to handling DDoS attacks.