I've been doing a bit of clearing up of loose ends on systems on my
LAN and decided that dnsmasq really only needs to listen on the
loopback address on all my systems except the actual DNS server for
the LAN.
So I changed the dnsmasq.conf file to the following on all systems
except the DNS server:-
#
#
# Default dnsmasq configuration file, with this configuration file dnsmasq
# provides only local DNS caching and no DHCP. This file is used on nearly
# all my systems which are ever on the home LAN.
#
#
# Set to listen only on localhost.
#
interface=
#
#
# This sets the upstream server[s] to the one[s] set by Network Manager,
# usually automatically using DHCP from the ISP's (or my) DHCP/DNS server.
# If we're on the home LAN the resolv-file will set the nameserver to
# 192.168.1.1, if away from home it will be the ISP's nameserver[s].
#
resolv-file=/run/NetworkManager/no-stub-resolv.conf
On my desktop system (192.168.1.3) this works as expected:-
chris$ nmap localhost | grep 53
53/tcp open domain
chris$ nmap 192.168.1.3 | grep 53
chris$
But on 192.168.1.4 it doesn't:-
chris$ nmap 192.168.1.4 | grep 53
53/tcp open domain
chris$
Both systems are running xubuntu with dnsmasq version 2.90.
... and another system, also running dnsmasq version 2.90:-
chris@t470$ nmap 192.168.1.128 | grep 53
53/tcp open domain
chris@t470
So why are they acting differently and, possibly more to the point,
how do I make dnsmasq listen only on the loopback address?
... and the /run/NetworkManager/no-stub-resolv.conf file is the same
on all the systems:-
# Generated by NetworkManager
search zbmc.eu
nameserver 192.168.1.1
--
Chris Green
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