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Introduction to DNSSEC: Securing Your DNS Infrastructure in Linux

September 12, 2024September 11, 2024LukeLeave a comment

The Domain Name System (DNS) is a foundational component of the internet, responsible for translating domain names into IP addresses. Despite its critical role, DNS was not designed with security in mind, making it vulnerable to a variety of attacks, including cache poisoning and spoofing. This is where DNSSEC (DNS Security Extensions) comes into play. DNSSEC is a suite of extensions that adds a layer of security to DNS by enabling authentication of DNS responses, protecting users and services from malicious redirection.

In this detailed technical blog post, we will explore the importance of DNS Security Extensions, how it works, and provide a step-by-step guide to securing your DNS infrastructure on Linux using DNSSEC.

What is DNSSEC?

DNSSEC (Domain Name System Security Extensions) is a protocol that enhances DNS by adding cryptographic signatures to DNS records. These signatures allow DNS resolvers (the systems responsible for querying DNS records on behalf of users) to verify the authenticity of the responses they receive from DNS servers.

Troubleshooting Common DNS Issues in Linux

August 15, 2024August 15, 2024LukeLeave a comment

Dealing with DNS issues can be frustrating, especially if you’re new to Linux. DNS is critical because it translates domain names like www.example.com into IP addresses that computers can understand. When DNS doesn’t work correctly, websites may not load, and you may have trouble accessing network resources. This guide will walk you through some common DNS issues in Linux and how to troubleshoot them effectively.

What is DNS, and Why Is It Important?

DNS (Domain Name System )is like a phonebook for the internet. It translates human-friendly website names into numerical IP addresses that computers use to find and load those websites. Without DNS, browsing the internet would require you to remember long strings of numbers instead of simple names.

How can I clear (flush) my DNS cache in Linux?

August 11, 2023August 11, 2023LukeLeave a comment

The Domain Name System (DNS) translates user-friendly domain names into the numerical IP addresses that computers understand. This translation process is expedited by the DNS cache, a local repository storing recent domain name lookups. While this cache enhances online efficiency, there are instances when its clearance becomes necessary. So, today, we will explain what it is and how to flush it in Linux systems and guide you through the process.

What is DNS Cache?

The Domain Name System (DNS) is a fundamental component of the internet, responsible for translating human-readable domain names into IP addresses that computers use to locate and communicate with each other. To expedite this process and reduce the time it takes to access websites or other online resources, operating systems and web browsers often maintain a local DNS cache.

In simple terms, a DNS cache stores recent DNS lookups, including the corresponding IP addresses. This means that when you visit a website, your computer doesn’t need to perform a full DNS lookup every time, which can improve page loading times. Instead, it can quickly retrieve the IP address from the cache. However, there are times when you might want to clear or flush it.

Linux, the object of the DNS cache poisoning attack

February 2, 2023August 23, 2023LukeLeave a comment

In 2020, researchers from the University of California and Tsinghua University found a new method to execute DNS cache poisoning attacks. Unfortunately, Linux, a very reliable OS, was the object of the DNS cache poisoning attack.

What is DNS cache poisoning?

A DNS cache poisoning (DNS spoofing) is a cyberattack that pollutes the cache on DNS resolver servers. This can cause the user to be redirected to the attacker’s server instead of the right one.

How to use the Traceroute command?

January 17, 2023August 15, 2023LukeLeave a comment

Are you a network administrator and want to gain insight into your network’s traffic? Then, the Traceroute command is here to your rescue! This simple yet powerful network diagnosis tool measures the latency of a connection to a given destination and provides a complete route path and associated latency. In this blog post, we’ll deeply dive into the Traceroute command and discuss how to use it, why to use it, and its benefits. So let’s get started and learn more about this invaluable networking tool!

What is the Traceroute command?

The Traceroute command is a powerful network diagnostic tool used to measure a connection’s latency to a given destination. When executed, this command sends a series of ICMP packets to the target, each with an increasing TTL value. As the responses are returned from each hop in the route to the destination, the Traceroute command can display the route path and associated latency. It can help network administrators find latency issues, track down errors, and understand the route path between two points. It is a valuable tool for troubleshooting and understanding networks.

How to check DNS records on Windows, Linux and macOS?

January 4, 2023October 26, 2023LukeLeave a comment

Being an online business owner or a network administrator, checking DNS records will become a constant task for you. So better to know how to do it from now!

How to check DNS records on Windows, Linux and macOS?

To check DNS records on Windows, Linux, and macOS, you can use the nslookup command. This command allows you to query DNS servers for information about a specific domain or hostname. Linux and macOS have another choice to check DNS records which is the host command. Both “nslookup” and “host” work well, but the second provides more detailed statistics and more options for precise searches. We do recommend using the host command!

Host command explained in detail

December 12, 2022March 14, 2023LukeLeave a comment

Knowing the Host command in detail is very useful. It is a Domain Name System (DNS) checking tool that can greatly help you. From now, consider time reading this article a good investment.

What is the Host command?

Host command is a helpful network utility to diagnose and check DNS records. Technically, it is software, and through its command-line interface, you can test the types and specific DNS records you want.

Linux Host command – Options & Examples

What is DNSSEC?

What is DNS, and Why Is It Important?

What is DNS Cache?

​What is DNS cache poisoning?

What is the Traceroute command?

​How to check DNS records on Windows, Linux and macOS?

What is the Host command?

What is DNS cache poisoning?

How to check DNS records on Windows, Linux and macOS?