DNS and Cloud Technologies
//The DHCP server has changed the lives of all administrator forever. It has given them the commodity of automatic IP assignment. After the introduction of DHCP, there was no need for some IT specialists to spend countless hours providing IPs for every device connected to the network device. But how exactly does DHCP work? Let’s find out!
Continue reading “What is DHCP? How does the DHCP server work?”
//When you browse the internet, you don’t write IP addresses to go to the pages you want; you just write the domain. In the “backstage”, every request that you do, passes through a DNS query. It first goes to your internet provider’s recursive DNS server. If it can’t find in the cache, the information needed, it will continue to other recursive servers until it gets to an authoritative DNS server who can give the IP address of the required domain. Basically, it is a name server, that is a middle-man between you, the user, and the authoritative DNS server.
1. Checks if the IP address is stored in the cache memory. There is a certain period of time, pre-defined by the domain’s owner called Time to Live or TTL. It says for how long the recursive server can hold the information. If it is still there, it will return the answer fast and won’t take further actions.
2. Searches for the IP address elsewhere. If it is not in the cache, it will continue the searching process until it gets to an authoritative server which has the information.
//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 But if the data is outdated, this recursive server need to find the IP elsewhere.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.
//For many years already, the Unicast protocol has been outdated for the purpose of fast and secure DNS. It can’t manage with massive DDoS attacks, can’t handle load balancing in different locations, and it is quite slow for a global presence. But don’t get desperate, a new technology is there to help you out.
So what can you use to provide fast and reliable DNS?
Anycast DNS is here to step in. It is by far superior technology! It reduces latency, give extra security and minimize downtime.
Continue reading “What is Anycast DNS and how does it work?”
//Dynamic DNS is a service that automatically and periodically updates your DNS’s A (IPv4) or AAAA (IPv6) records when your IP address changes. These IP changes are made by your Internet provider.
The Dynamic DNS monitors the IP address for changes. When the address changes (which it will if you have a dynamic IP address), the DDNS (or DynDNS) service updates your new IP address.
It can be very useful for people who want to host their website, access CCTV cameras, VPN, app or game server from their home computer. It is cheaper than to have a static public IP and by setting up Dynamic DNS, you will avoid the need to update all of your records whenever your IP changes manually. Also, static IP address is not always an option; it depends on your Internet provider.
Continue reading “What is Dynamic DNS? How does it work and how to setup DDNS?”
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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.
//Anycast DNS is one amazing technology that can save you a lot of time.
But first, let’s explain it to you in a simple way so you really understand why this can help you with your company network.
Imagine it as a massive phone book. They contain a register of domain names and translate them to IP (internet protocol) addresses. For us humans it is easy to remember the domain names but the computers, they prefer numbers to orientate so they access websites based on their IPs.
The information of those DNS servers is saved and organized in the Central Registry. Internet providers and Host companies need to check with the Central Registry to get all the DNS updates.
When you write the following web address www.facebook.com, your service provider will check the DNS for this website, then translate to machine language and direct you to the following IP 66.220.144.0.
