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16, Mar 2022
DNS outage – Definition and Details

DNS outage is the time when your Domain Name System goes down for any reason (your nameservers are hit, overloaded, etc. ), and the server can’t resolve your domain name to its IP address. The first step in entering a website is to resolve the DNS. Without it, the browser won’t know where your website is located, and it won’t be able to find its content. In addition, visitors who want to access your domain will see an error message and cannot access your site.

So, we can say that a DNS outage is when website guests type your website’s name (domain name) into their device and can’t load it (they are not routed to its IP address).

What can cause a DNS outage?

  • Configuration errors. DNS outages can be caused by various human errors when configuring DNS. Script errors, incorrectly typed IP addresses, firewall configuration issues, etc.
  • 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.
  • DDoS and DoS attacks. The purpose of Denial-of-Service and Distributed Denial-of-Service is to cause a failure of the service. You will experience a DNS outage if they succeed.
  • An occurrence in the data center (the location of the name server). The “cloud” is situated 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.

How to prevent it?

Of fact, you could protect yourself against it, and there are some steps you can do to avoid future DNS outages:

  • Secondary domain name service. The most straightforward approach that could save you is to employ a secondary DNS server in most circumstances. Ideally, with a different DNS provider. The secondary DNS will let you have additional authoritative DNS servers that can still answer to queries even if the primary DNS is unavailable. The more, the merrier.
  • Load balancing. You can set up your nameservers to distribute traffic between them using load balancing. So, you can be sure that the load is not going on one of them. The performance and resilience of your DNS network will be improved by spreading the heavy load.
  • Protection against DDoS attacks. A DDoS attack is often the cause of a domain name problem. Furthermore, traffic attacks have become relatively inexpensive, and it is usual for hackers, sometimes hired by your competitors, to pull your domain down. So, what can you do? You can get DDoS protection for your Domain Name System servers that can withstand heavy load.

Conclusion

We can infer that a DNS outage is highly harmful and can cause significant damage to your business. Therefore, take the appropriate steps to avoid this from happening, such as implementing Secondary DNS, a Load Balancing method, and DDoS protection. This will provide you peace of mind that your Domain Name System is in good working order.

10, Mar 2022
What does a DDoS attack mean?

What exactly is a DDoS attack?

A DDoS or Distributed-Denial-of-Service attack is a form of cyber attempt. It means that the goal of a DDoS assault is to overload a server, computer, or network with massive amounts of traffic generated from various sources. Then, when the target fails, its services or access to it for regular users is denied.

When cybercriminals succeed in shutting down your company, it will have an impact on your revenues. Furthermore, it will increase your costs for resolving the issue and harm your reputation. In addition, a DDoS attack might be used as a distraction by thieves in preparation for another data breach attack. So, if your website is down for an extended period of time, your search engine ranking may suffer.

How does it work?

DDoS attacks are mostly caused by devices connected to the Internet. Malware infects many appliances, computers, and IoT, and the attacker gains control of them. Bots or zombies are terms commonly used to characterize such devices, and a botnet is a collection of them.

The hacker is now ready to launch the attack after establishing the botnet. They’re all controlled from afar, and each one is given orders. All of the zombies or bots that are affected send requests to the victim’s IP address. Eventually, the network or server will become overburdened and unable to handle the load. Because each bot seems to be a standard Internet device, distinguishing between legitimate and malicious traffic is difficult.

DDoS attacks types

We can divide DDoS attacks into three categories:

  • Attacks on the application layer — They overwhelm applications with bogus requests.
  • Assaults that deliver a large amount of harmful traffic to a device, website, or server are known as volume-based attacks. There are ICMP, UDP, and spoofed-packet flood attacks, for example.
  • DDoS attacks at the network layer or protocol level send vast amounts of packets to their target network infrastructures and tools. SYN floods and Smurf DDoS are two well-known protocol attacks.

For all forms of attacks, the purpose is always the same. That is to make the target’s resources sluggish and unresponsive at all times.

How can you defend yourself against a DDoS attack?

  • Always keep your systems up to date. If you run your own DNS server, you must keep it up to date at all times. You should keep an eye out for potential flaws or malfunctions and update your software on a regular basis. 
  • Monitoring of traffic. For stopping a DDoS attack, technology that constantly monitors data and detects abnormal patterns and abrupt traffic surges is critical.
  • Have load balancing technology. It distributes traffic by routing it from one server to another, attempting to strike a balance that keeps servers from becoming overburdened.
  • Invest in anti-DDoS software. You need modern technology to increase your defense against DDoS attacks. A combination of tools, rather than a single one. It will cost you money, but it will be much less than the cost of dealing with the aftermath of an attack.

Recommended article: DNS outage – Definition and Details

Conclusion

DDoS attacks are a significant problem. They are a successful method of disrupting web services. They have the ability to take down your website for an extended length of time. But for this not to happen, prepare yourself!