The Recursive DNS server is one of the main elements in the Domain Name System (DNS). Let’s explain a little bit more about it.
Reverse DNS – What is it?
Reverse DNS or, for short rDNS maps an IP address to its corresponding domain name. It acts in the opposite direction of Forward DNS, where the domain name points to the corresponding IP address. Typically rDNS is offered by DNS hosting providers as an additional service. However, when you decide to use it, you should also create a Master Reverse zone and PTR records. Thanks to them, you will be capable of providing proof that the exact IP address and your domain name actually match.
What is zone transfer?
Zone transfer is a process of duplicating the DNS information (DNS records) from the Primary DNS zone to the Secondary DNS zone. That way, you are able to establish multiple copies of your DNS records on several name servers. As a result of completing the transfer, you are going to ensure better availability if one of the name servers goes down. In addition, you are going to guarantee faster DNS resolution in case you own an international website with users coming from all around the globe and multiple points of presence (PoPs).
The DNS resolution happens daily, and we don’t even notice it. So let’s explain a little bit more about it.
DNS resolution explained.
The process of DNS resolution is triggered by typing a domain name into the browser. Thanks to it, the domain names are quickly and easily translated to IP addresses.
A particular domain name could have more than one IP address, for instance, one IPv4 address and one IPv6 address. Then the DNS resolution is going to proceed for both of them. However, in order to connect with the domain, we are going to need only one of these addresses.
The quick way for translating domain names become a necessity long ago. Back in the day, every existent IP address was saved in a Host file that was updated manually. But, as you know, the number of devices has increased tremendously, until, at some point, it was not effective anymore to search for IP addresses that way.
The Domain Name System (DNS) was launched, and the search and the Internet became a lot easier. The user only has to type the domain name, and it simply reaches the website. It is something we don’t even understand how quickly happens.
We live in an environment where time is probably one of the most critical factors in our everyday life. Computing and networking are not any different. Many of the processes frequently must happen in a specific period of time. Here comes TTL in hand. In some cases, the task should be finished in milliseconds. Can you imagine that? Let’s make things a little bit more precise and explain what TTL actually is?
What is TTL?
TTL is the short acronym for time-to-live. It refers to the value that points to the exact period of time or number of hops that the data packet is configured to be alive on a network. In some cases, also in the cache memory. When that time expires, or it hops the number of times, routers will discard it. There exist many different varieties of data chunks. Every and each of them operates with their particular TTL. That means the time such data will be held in a device to function or finish a certain task.
Everybody wants to avoid DNS downtime! Unfortunately, it affects your reputation, annoys your loyal and potential clients, and costs you money.
DNS downtime is the time your domain name won’t be resolved to its corresponding IP address. During that time, clients won’t be able to use your service or load your domain. An error will be pointed out every time they request it.
The Domain Name System (DNS) is the keystone for the Internet to work. No matter its dimension and importance, it also suffers from vulnerabilities, hacking attempts, software and hardware issues, networks’ problems, database corruption, etc. And if it stops, your domain also will.
How can you prevent DNS downtime?
After its launching in the 90s, load balancing becomes a game-changer in traffic distribution across networks. Round-Robin as a load balancer is significant in maintaining the flow of data moving efficiently and easily among servers and endpoints. It is also one of the most common and affordable techniques. Let’s explain a little bit more about it.
How does load balancing work?
DNS PTR record is one of the essential DNS records. It is one of the few that deserve proper attention. So let’s explain a little bit more and get to know why it is so important.
DNS PTR record – meaning
The DNS PTR record has a specific purpose. It is to point the IP address to the domain name. Therefore, it can operate successfully both with IPv4 and IPv6 addresses. Furthermore, this type of DNS record makes it possible for you to achieve Reverse DNS.
Receiving mail servers want to verify the source of an email. For this matter, they will do a DNS Reverse lookup, and they will investigate for PTR records. DNS PTR record makes it possible to guarantee that the IP address truly belongs to the domain name.
DMARC record is a must for every domain owner. If you have a website, you would want to ensure that your customers will only receive emails that you have sent yourself. The communication between you and your visitors will remain clear.
The DMARC record explained.
When we are talking about DNS spoofing, the threat is real. As an online business owner or administrator it is essential to know what risk is hidden behind these words. Understanding it will help for sure with protecting your clients, yourself, and your business. Let’s talk a little more about what it is and how to defend yourself.