DNS

31 Guides Available

An Introduction to DNS and User Privacy

You can do everything you can to secure your Web traffic. Use a VPN when you travel. Enable multi-factor authentication where possible. And yet, for all these precautions, an attacker may still be able to access your online behavior.

How to Configure DNS Primary and Secondary Servers

A single web server or a database going offline is a hassle, but what if all services became unreachable? That’s exactly what happens when Domain Name System (DNS) servers stop working.

Introduction to DNS on Linux

The Domain Name System (DNS) is a worldwide directory that maps names to addresses and vice versa. It also provides many other types of information about computing resources. Although the DNS operates largely hidden from view, the global Internet would not work without it.

What Is a DNS Server?

Without DNS, the internet cannot function. The effects of downed DNS servers around the world lead to outages such that business cannot happen. Websites are unreachable, apps don’t work, and data cannot be sent or received.

Register Custom DNS Name Servers

DNS name servers (also referenced as the single word nameservers) are the backbone of the Domain Name System. They are the servers that host a domain’s DNS records, which map human-readable domain names to IP addresses.

Troubleshooting DNS Issues

The most common DNS error is a simple typo, whether it’s from the client or the server. Typos and other incorrect DNS data cause many problems. Even when data is correct, DNS can still be a difficult protocol to troubleshoot.

Understand and Use IP Addresses

The Internet Protocol (IP), as described in RFC 791, is the framework that underlies the behavior of the entire internet. The Internet Protocol Version 4 (IPv4) and Version 6 (IPv6) address systems are used to identify interfaces and locate hosts on the network. This allows hosts and routers to determine the path to another networking device and send packets to it. This guide outlines how to understand IP addresses, and how to describe and use them.

Set Up Cloudflare with Linode

Cloudflare provides a content delivery network (CDN) for websites, APIs, and other applications hosted on the web. The Linode platform is compatible with Cloudflare. If you run a web application on a Linode, you can enroll it in Cloudflare’s CDN. Using the Cloudflare network can speed up your application’s response time and protect your Linode from denial-of-service attacks (DoS).

Using Your System's hosts File

Previewing Websites Without DNS

Provide Authoritative DNS Services with NSD on Ubuntu 12.04

NSD is a lightweight yet full-featured open-source name server daemon created to provide an alternative to BIND.

Use Unbound for Local DNS Resolution on Ubuntu 12.04 LTS (Precise Pangolin)

In the default configuration, Linode systems are configured to query DNS resolvers provided by Linode. If you don’t want to use a third party DNS service on your system, you may consider running an independent DNS resolving and caching service such as Unbound DNS resolver. Unbound is easy to install and configure, which makes it an ideal resolver for simple deployments.

Authoritative DNS Services with NSD on Debian 6

NSD is a lightweight yet full-featured open source name server daemon created to provide an alternative to BIND.

Authoritative DNS Services with NSD on Ubuntu 11.04

NSD is a light-weight yet full-featured open source name server daemon created to provide an alternative to BIND.

Use Unbound for Local DNS Resolution on Fedora 15

Use Unbound for Local DNS Resolution on Ubuntu 11.04 (Natty)

Use Unbound for Local DNS Resolution on Debian 6 (Squeeze)

Use Unbound for Local DNS Resolution on Fedora 14

Use Unbound for Local DNS Resolution on Ubuntu 10.10 (Maverick)

Authoritative DNS Services with NSD on Ubuntu 10.10

NSD is a light-weight yet full-featured open source name server daemon created to provide an alternative to BIND.

Provide Authoritative DNS Services with NSD on Fedora 14

NSD is a lightweight yet full-featured open source name server daemon created to provide an alternative to BIND.

Authoritative DNS Services with NSD on Ubuntu 10.04

NSD is a lightweight yet full-featured open source name server daemon created to provide an alternative to BIND.

Use dig to Perform Manual DNS Queries

Provide Authoritative DNS Services with NSD on Fedora 13

NSD is a lightweight yet full-featured open source name server daemon created to provide an alternative to BIND.

Use Unbound for Local DNS Resolution on Fedora 13

Use Unbound for Local DNS Resolution on Ubuntu 9.10

Provide Authoritative DNS Services with NSD on Ubuntu 9.10 (Karmic)

NSD is a lightweight yet full-featured open source name server daemon created to provide an alternative to BIND.

Use Unbound for Local DNS Resolution on Ubuntu 10.04 LTS (Lucid)

Provide Authoritative DNS Services with NSD on Debian 5 (Lenny)

NSD is a lightweight yet full-featured open source name server daemon created to provide an alternative to BIND.

Use Unbound for Local DNS Resolution on Debian 5 (Lenny)

Overview of DNS and DNS Records

The Domain Name System (DNS) is the Internet’s address book. DNS directs web traffic to your Linode and email to your inbox by mapping memorable domain names like example.com to IP addresses like 192.0.2.8 or 0123:4567:89ab:cdef:0123:4567:89ab:cdef. This guide introduces basic DNS concepts and the different types of DNS records.

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Previewing Websites Without DNS

Provide Authoritative DNS Services with NSD on Ubuntu 12.04

Use Unbound for Local DNS Resolution on Ubuntu 12.04 LTS (Precise Pangolin)

Authoritative DNS Services with NSD on Debian 6

Authoritative DNS Services with NSD on Ubuntu 11.04

Use Unbound for Local DNS Resolution on Fedora 15

Use Unbound for Local DNS Resolution on Ubuntu 11.04 (Natty)

Use Unbound for Local DNS Resolution on Debian 6 (Squeeze)

Use Unbound for Local DNS Resolution on Fedora 14

Use Unbound for Local DNS Resolution on Ubuntu 10.10 (Maverick)

Authoritative DNS Services with NSD on Ubuntu 10.10

Provide Authoritative DNS Services with NSD on Fedora 14

Authoritative DNS Services with NSD on Ubuntu 10.04

Use dig to Perform Manual DNS Queries

Provide Authoritative DNS Services with NSD on Fedora 13

Use Unbound for Local DNS Resolution on Fedora 13

Use Unbound for Local DNS Resolution on Ubuntu 9.10

Provide Authoritative DNS Services with NSD on Ubuntu 9.10 (Karmic)

Use Unbound for Local DNS Resolution on Ubuntu 10.04 LTS (Lucid)

Provide Authoritative DNS Services with NSD on Debian 5 (Lenny)

Use Unbound for Local DNS Resolution on Debian 5 (Lenny)

Overview of DNS and DNS Records

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