Month: December 2021


Differences between Unicast DNS and Anycast DNS

Unicast DNS and Anycast DNS are both great ways to route the incoming traffic. Let’s see what are their differences!

Unicast DNS – Definition

Unicast DNS is a traffic routing mechanism that operates in a one-to-one way. The information is transferred from its source node to only one specific destination. The receives and the sender are the only participants in the particular communication in the selected route. Therefore, Unicast DNS is an impressive solution for the transportation of information on the Internet. 

In addition, Unicast DNS is capable of routing DNS queries among DNS servers and DNS users. As a result, the information for a particular domain and its IP address is stored only in one server. Therefore, every incoming request has to travel and reach that server to receive an answer, regardless of its geographical position. That means when a user is near the location of the server, and its response is going to be way quicker. However, in case the user is at a distance from the server, the response is going to take more time, and probably it is going to experience latency.

When we are analyzing Unicast DNS and Anycast DNS, there is no doubt that Unicast is cheaper and easier to use. The reason for that is it includes maintaining and monitoring only one server. However, it is a great option for local businesses. Yet, the availability of your domain relies only on that specific DNS server which could be a huge risk if it fails for some reason. 

Anycast DNS – Definition

Anycast DNS is a mechanism for routing the traffic and achieving fast delivery of content from the websites. It utilizes singular IP addresses on several DNS servers. To put it another way, a single IP address but used by all the nameservers that are on your DNS network.

The purpose of implementing Anycast DNS is to have servers in various places all around the world to be as near as possible to your potential users. This is extremely valuable for Anycast DNS clients because the most nearby they can have a server to their end-users, the quickest their requests can be answered to. It depends on the location from where the user initiated the request for the website, and the nearest available server is going to resolve it. That way, users are able to explore your website without any unnecessary waiting time.

In addition, if the closest DNS server is down for some reason or under attack, the second one, which is closest to the user and available, is going to resolve the request. That means your website is still going to be reachable for your users, and because Anycast DNS uses the shortest route, your domain’s resolution time is pretty fast. 

Unicast DNS and Anycast DNS – Comparison

When we are comparing Unicast DNS and Anycast DNS, it is required to mention the DNS recursive server, which is the one obtaining the DNS records for the demanded hostname. The process usually involves a large number of DNS servers. 

In Unicast DNS routing, the DNS recursive server is going to request the data from the first DNS server on the list, pause till it responds, or there is a timeout, and then it will be capable of asking the following server. For sure, that could cause high latency.

In Anycast DNS routing, DNS recursive servers are configured with an individual IP address for every blend of DNS servers. As a result, the latency is reduced, and there are no pauses when a recursive server queries a DNS server that does not respond. 

DNS Network

DNS load balancing – the best way to manage your traffic

DNS load balancing – Definition

DNS load balancing is a very commonly used technique for achieving the optimal management of the incoming traffic of a hostname. It provides an organized and effective way of spreading the inbound network or application traffic across multiple servers.

If you are an owner of a very popular website, suddenly you would notice that the traffic is going to be a lot. It is going to receive many numerous requests from customers and users. For each of these requests, it is going to be necessary to return a fast and accurate answer with the exact piece of data, such as video, text, and images. In addition, the whole process must be completed in a secure and reliable way.

First, the DNS load balancers are going to utilize several criteria and examine the incoming traffic. The next second step for them is to choose and determine to let the traffic proceed or, in another circumstance, to stop it. They can decide to redirect it to a different server based on a load of a packet at a particular moment.

How does it work?

For the purpose to understand better the process in which DNS load balancing works, it is best to follow its usual order:

  1. Traffic gets to your website. Users and clients create a lot of requests toward your website’s server by the Internet.
  2. The traffic is distributed over the server resources. The load balancer takes each request and directs it to an appropriate server.
  3. Each server operates with a reasonable workload. The server receives the request, and it decides to accept it. Next, it replies with an answer to the balancer in case it is not flooded with too many requests.
  4. The server responds to the query. Finally, the process is completed again but in a backward direction to carry the server’s response back to the user.

Why is DNS load balancing best for traffic management?

There are a couple of main ideas for implementing DNS load balancing: 

  • Speed. The most apparent purpose is better speed. There is no uncertainty regarding that. If there is a DNS network of servers including many locations all around the world, your visitor is going to get much faster responses. Speed is a severe factor for SEO. Therefore you can positively have an advantage above your competitor with a well-configured DNS balancer. 
  • Security. As we previously mentioned, it is capable of examining the incoming traffic. It could check the data packets for errors and prevent malicious efforts to harm your DNS server. It could prevent severe difficulties leading to data breaches, phishing attacks on your customers, downtime, and more. 
  • Reliability. Directing the traffic among the multiple DNS servers could prevent DDoS attacks and be beneficial even in everyday situations. Picture that you have a sale on your website, and you are aware that a peak of traffic during a particular time is possible. If you don’t have additional help, your website could crash, and you will have lots of annoyed clients. This could perhaps harm your brand.