Small scale DNS and DHCP with Dnsmasq
Easy Mapping

© V. Yakobchuk, Fotolia
Dnsmasq is a practical alternative for DNS on a small scale.
DNS provides a means for associating domain names with IP addresses. A system of DNS servers operating on the Internet delivers the seamless address mapping that lets you surf the web with names instead of numbers. But what if you have a very small network that resides behind a firewall with network address translation? A simple local network doesn't need anything close to the functionality provided by a full-blown DNS implementation. Typically, it is quite enough to respond to DNS requests from hosts on the local network and forward all other requests to the provider's DNS server.
Dnsmasq is a simple, lightweight implementation of DNS, DHCP, and TFTP for small, local networks. This practical tool serves up addresses for the local network and forwards requests for external hosts to any DNS server. Because Dnsmasq integrates DNS with DHCP, it remembers the names of hosts that receive addresses through DHCP. This approach significantly reduces configuration time. All you need to do is set up each client to use DHCP, and you won't need to maintain an /etc/hosts file for hostname-to-address mapping. The program is frugal in its use of resources, and it is therefore well suited for deployment on Linux-based router systems.
Several popular Linux distributions have Dnsmasq in their repositories. On Debian, Ubuntu, and openSUSE, you need to install the dnsmasq package. The popular router distributions OpenWrt, DD-WRT, and FreeWRT all include the program [1] [2]. In our lab, Dnsmasq ran on Debian from a USB stick attached to an Asus WL-500g Premium DSL router (Figure 1) [3].
[...]
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.

News
-
Red Hat Releases RHEL 10 Early
Red Hat quietly rolled out the official release of RHEL 10.0 a bit early.
-
openSUSE Joins End of 10
openSUSE has decided to not only join the End of 10 movement but it also will no longer support the Deepin Desktop Environment.
-
New Version of Flatpak Released
Flatpak 1.16.1 is now available as the latest, stable version with various improvements.
-
IBM Announces Powerhouse Linux Server
IBM has unleashed a seriously powerful Linux server with the LinuxONE Emperor 5.
-
Plasma Ends LTS Releases
The KDE Plasma development team is doing away with the LTS releases for a good reason.
-
Arch Linux Available for Windows Subsystem for Linux
If you've ever wanted to use a rolling release distribution with WSL, now's your chance.
-
System76 Releases COSMIC Alpha 7
With scores of bug fixes and a really cool workspaces feature, COSMIC is looking to soon migrate from alpha to beta.
-
OpenMandriva Lx 6.0 Available for Installation
The latest release of OpenMandriva has arrived with a new kernel, an updated Plasma desktop, and a server edition.
-
TrueNAS 25.04 Arrives with Thousands of Changes
One of the most popular Linux-based NAS solutions has rolled out the latest edition, based on Ubuntu 25.04.
-
Fedora 42 Available with Two New Spins
The latest release from the Fedora Project includes the usual updates, a new kernel, an official KDE Plasma spin, and a new System76 spin.