Dnsmasq - Revision history

Kenneth: /* Round Robin DNS */

2025-12-14T00:06:01Z

Round Robin DNS

← Older revision		Revision as of 00:06, 14 December 2025
Line 168:		Line 168:
	address=/domain.tld/192.168.0.2		address=/domain.tld/192.168.0.2
	address=/domain.tld/192.168.0.3		address=/domain.tld/192.168.0.3

			Dnsmasq performs DNS round-robin by default (unless --no-round-robin is set) when multiple A records for the same hostname are defined in its configuration, rotating the order of IP addresses returned to clients for basic load balancing. To configure it, add multiple address=/hostname/IP lines in the configuration file or /etc/hosts file.

	== Authoratiative DNS Server ==		== Authoratiative DNS Server ==

Kenneth: /* dhcp */

2025-12-13T23:02:45Z

dhcp

@@ Line 102: / Line 102: @@
 * HOWTO Use dnsmasq - http://blogging.dragon.org.uk/index.php/howtos/howto-use-dnsmasq-localhost-nameserver
-== dhcp ==
+== DHCP ==
 /etc/dnsmasq.d/dhcpd.conf
@@ Line 122: / Line 122: @@
   # ubuntu
   /var/lib/misc/dnsmasq.leases
 == Authoratiative DNS Server ==

Kenneth: /* Clear Lease */

2024-01-20T00:51:03Z

Clear Lease

Show changes

Kenneth: /* Clear Lease */

2018-12-04T03:18:19Z

Clear Lease

New page

== Dnsmasq ==

Dnsmasq - http://www.thekelleys.org.uk/dnsmasq/doc.html

"Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server. It is designed to provide DNS and, optionally, DHCP, to a small network. It can serve the names of local machines which are not in the global DNS. The DHCP server integrates with the DNS server and allows machines with DHCP-allocated addresses to appear in the DNS with names configured either in each host or in a central configuration file. Dnsmasq supports static and dynamic DHCP leases and BOOTP/TFTP/PXE for network booting of diskless machines."

== Installation ==

=== Manual Installation ===

<pre>
mkdir -p ~/.src ; cd ~/.src
git clone git://thekelleys.org.uk/dnsmasq.git
cd dnsmasq
git checkout v2.63
make clean
make
</pre>

<pre>
# installs only two files: 'dnsmasq' and the man page
# sudo make install # installs to /usr/local/sbin/
sudo make install PREFIX=/opt/dnsmasq
</pre>

<pre>
# configuration files directory
# sudo cp dnsmasq.conf.example /etc/dnsmasq.conf
TFILE=`mktemp`
cat > $TFILE <<EOF

#local-ttl=300
expand-hosts
domain=qa.onpar.net
#log-queries
conf-dir=/etc/dnsmasq.d
#resolv-file=/etc/resolv.conf

EOF
sudo cp $TFILE /etc/dnsmasq.conf
rm -f $TFILE
sudo mkdir -p /etc/dnsmasq.d
</pre>

<pre>
# startup, or use the init.d script following
./dnsmasq -s `dnsdomainname`
</pre>

Set the localhost or loop device on the server as a nameserver so it can use the
DNS service that it is running. Add the nameserver line below to the top of the list in /etc/resolv.conf.
# /etc/resolv.conf:
nameserver 127.0.0.1

Add the IP address of the DNS host to the /etc/hosts for reverse DNS lookup.
# /etc/hosts
10.10.10.1 fw

See [[dnsmasq-init.d]]

=== RPM Forge ===

yum install dnsmasq --enablerepo=rpmforge
service dnsmasq start

=== Configuration ===

Easy: just put what you want in /etc/hosts, and restart dnsmasq

config files go in /etc/dnsmasq.d/

Sample /etc/dnsmasq.conf:
<pre>
# Log the results of DNS queries handled by dnsmasq
# NOTE: logs are logged to daemon.debug, make sure syslog captures that level.
log-queries

# Local domain TTL
local-ttl=60

# Never pass short names to the upstream DNS servers.
# If the name is not in the local /etc/hosts file then "not found" will be returned.
domain-needed

# All reverse IP (192.168.x.x) lookups that are not found in /etc/hosts will be
# returned as "no such domain" and not forwarded to the upstream servers.
bogus-priv

# We can see our local hosts via our home domain without having to
# repeatedly specify the domain in our /etc/hosts file.
expand-hosts

# Your local domain name. It will tell the DHCP server which host to give out IP addresses for.
domain=example.com

# The range of IPs that DHCP will serve: 192.168.0.20 to 192.168.0.50, with a lease time
# of 24 hours. The lease time is how long that IP will be linked to a host.
dhcp-range=192.168.0.20,192.168.0.50,24h
</pre>

References:
* HOWTO Use dnsmasq - http://blogging.dragon.org.uk/index.php/howtos/howto-use-dnsmasq-localhost-nameserver

== dhcp ==

/etc/dnsmasq.d/dhcpd.conf
dhcp-range = eth0, 10.10.10.150, 10.10.10.199, 12h
dhcp-host = 00:10:99:31:b7:09, 10.10.10.7, voip, 24h

#dhcp-host=00:10:99:31:b7:09,10.10.10.7,24h # voip
dhcp-host=00:0C:29:64:3D:2A,10.10.10.30,24h # plex

References:
* HowTo/dnsmasq - Debian Wiki - https://wiki.debian.org/HowTo/dnsmasq
* DNSMasq as DHCP server - DD-WRT Wiki - http://www.dd-wrt.com/wiki/index.php/DNSMasq_as_DHCP_server

=== Clear Lease ===

Edit the lease file and restart dnsmasq:
# centos
/var/lib/dnsmasq/dnsmasq.leases
# ubuntu
/var/lib/misc/dnsmasq.leases

== Issues ==

=== Dynamic DNS ===

Dynamic DNS is not supported externally. [http://www.clearfoundation.com/component/option,com_kunena/Itemid,232/catid,28/func,view/id,4216/]

== keywords ==

[[Category:DNS]]
[[Category:Linux]]