There are various ways of sending data over IP – TCP, UDP, DCCP, SCTP, RSVP and more. We will focus our attention on the two that are most used – the UDP (User Datagram Protocol) and the TCP (Transmission Control Protocol).
UDP and TCP
Both protocols are used to send packets of data over the internet. They do that on top of the IP protocol, which means that they direct the packets to IP addresses. They are treated very similar on their way from the users’ computers, through the routers and all the way to the end destination.
Continue reading “Why does DNS use UDP?”
The authoritative DNS server is the final holder of the IP of the domain you are looking for. When you write a domain name in your browser, a DNS query is sent to your internet service provider (ISP). The ISP has a recursive server, which might have the needed information cached in its memory. But if the data is outdated, this recursive server need to find the IP elsewhere. It will try to find it in other recursive servers, but if it can’t, it needs to get the IP address from an authoritative DNS server.
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The recent Black Friday we again saw the news for record-breaking revenues and profits. Over the past few years, the web has gotten faster, according to Google, 53% of users will abandon a site if it doesn’t load within three seconds. By this, you can guess that for a shopping site, the speed of the website reflects its revenue. So, we want to see whether e-commerce sites got faster as well?
The DDoS attacks are also increasing. According to Kaspersky Lab 33% of organizations experienced a DDoS attack in 2017, compared to 17% in 2016. So we also want to know if the top shopping websites are well prepared for future attacks.
In this article, we will check with our DNS tool all of the top 50 E-Commerce websites. We will see if their speed and DDoS protection is fine or they will need to improve. Based on our research we will make recommendations how these websites can improve.
Continue reading “A case study of the top 50 e-commerce sites and their DNS”
We have already talked what is a DNS server or name server as it is also known. It is a complicated system that translates what we write (the domain name and address of a website that we desire) to IP addresses that computers and servers can understand.
Any DNS can be programmed to be primary (master) or secondary (slave), depends on the needs of the system as a whole. You can even have a primary DNS server that is secondary for another zone.
So what is the difference?
The hierarchy. The primary is the main one, and the secondary gets the DNS records from the primary. There are few different configurations of connecting the secondary that we would show you in a bit, but first, we want to explain to you why you need a secondary DNS.
If it does the same, why do you need it?
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You cannot imagine the internet without DNS. There is almost no service that doesn’t depend on DNS technology. E-mails, VoIP, web services, all kind of CRM and ERP systems and much more. DNS is so important that we must take care of our network and make it as secure as possible.
Here we will show you some good practices to manage your DNS. Prevention is the best defense. Pay attention to these pieces of advice and take action.
Hide the master DNS
Configure the master DNS as a hidden. Like this, it will not be shown in the records of the name server. It will not appear, and it will not respond to any queries. Its purpose will be to give zone transfers to secondary name servers which will be public but doing it safely and hidden.
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Domain Name System – DNS
DNS – Domain Name System is an amazing technology. It helps us open internet addresses without a hustle. We easily write the domain name and the DNS has the job to find the IP of the domain we wrote. Just like the phone book on your mobile phone, you need to find Mike, so you write “Mike”, and you don’t need to remember his actual number, great isn’t it?
DNS is an essential part of the Internet. It manages to translate all the inquiries into IP addresses, and like this, it can identify different devices that are connected to the network.
Continue reading “What is DNS?”
The network performance has become incredibly important. No matter if your organization is big or small, you don’t want to experience operational issues or network reliability problems. Load Balancing managed the demand by distributing the traffic and the application load over different servers depending on their current load.
It is not a new invention. In its early days, it was used between the end device and the application servers to check the servers and to send traffic to the least occupied.
But with the evolving of the networks, the load balancing has gotten a new shaped. Now it is not a simple distribution system. The load balancing has become very divided.
For example, there is application load balancer which distributes one single application over the servers; there is another which distributes only between the server cluster; another directs the traffic from multiple paths to a single destination.
Other load balancing solutions are very advanced. They can shape the traffic and act as intelligent traffic switches, do different health checks on the content, applications, and servers, add extra security on the network and protect it from malicious software and improve availability.
Continue reading “What is Load Balancing?”
We already showed you what DNS is but do you know what CDN stands for?
A CDN – Content Delivery Network is responsible for the content delivery. We all interact with CDNs on a daily basis – when we watch a video, when we read an article, when we shop online or when we use a social network site. The main reason why they exist is to reduce latency, the delay between your demand and the moment it gets on your screen. Higher latency makes us impatient and gets us angry. There are many reasons it can happen, but the main is the physical distance between your computer and the server which hosts the website. CDN makes the magic of shortening that distance, and by doing so, it improves the speed dramatically.
Continue reading “How to create your CDN using DNS”
DNS and why does it matter?
DNS – domain name system is a marvelous invention. It makes it easy for all of us to enter our favorite addresses on the web. We don’t need to remember thousands of IP numbers of all websites that we use; we simply write the domain name and the DNS magically matches our text with the associated IP and show us the result.
Continue reading “Why do we need Managed DNS?”