Dnsmasq Setup Notes
By Dag, on December 29th, 2016First use Iptables to force all 53 traffic to 5353 on a device with 2 NICs. One that runs as DHCP client outwards, and serves as DHCP server inwards. TODO is to set up logging, and a LAMP (Apache,MySQL,PHP) web installation to manage and admin the custom hosts file, based on data from log file(s).
Relevant /etc/dnsmasq.conf settings:
/etc/dnsmasq.conf
# Listen on this specific port instead of the standard DNS port
# (53). Setting this to zero completely disables DNS function,
# leaving only DHCP and/or TFTP.
port=5353
# If you don't want dnsmasq to read /etc/resolv.conf or any other
# file, getting its servers from this file instead (see below), then
# uncomment this.
no-resolv
# Add other name servers here, with domain specs if they are for
# non-public domains.
server=8.8.8.8
# If you want dnsmasq to listen for DHCP and DNS requests only on
# specified interfaces (and the loopback) give the name of the
# interface (eg eth0) here.
# Repeat the line for more than one interface.
interface=eth1
# If you don't want dnsmasq to read /etc/hosts, uncomment the
# following line.
no-hosts
# or if you want it to read another file, as well as /etc/hosts, use
# this.
addn-hosts=/etc/dnsmasq.hosts
# On systems which support it, dnsmasq binds the wildcard address,
# even when it is listening on only some interfaces. It then discards
# requests that it shouldn't reply to. This has the advantage of
# working even when interfaces come and go and change address. If you
# want dnsmasq to really bind only the interfaces it is listening on,
# uncomment this option. About the only time you may need this is when
# running another nameserver on the same machine.
bind-interfaces
# Uncomment this to enable the integrated DHCP server, you need
# to supply the range of addresses available for lease and optionally
# a lease time. If you have more than one network, you will need to
# repeat this for each network on which you want to supply DHCP
# service.
dhcp-range=192.168.50.2,192.168.50.100,12h
2 NIC Setup - /etc/network/interfaces:
auto lo
iface lo inet loopback
iface eth0 inet dhcp
iface eth1 inet static
address 192.168.50.1
netmask 255.255.255.0
network 192.168.50.0
broadcast 192.168.50.255A normal interfaces static setup would look like this:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.50.1
netmask 255.255.255.0
gateway 192.168.50.1
dns-nameservers 8.8.8.8 8.8.4.4