Public bug reported:
If I start dnsmasq as follows
dnsmasq --conf-file= --resolv-file=/tmp/r.conf --bind-dynamic
--listen-address=127.0.3.1
echo "nameserver 192.168.1.254" > /tmp/r.conf
then I can resolve a name, e.g., "www.microsoft.com", with dig.
dig @127.0.3.1 www.microsoft.com
And I can still resolve names with that "dig" command if I start dnsmasq
as follows (with "--interface=eth0").
dnsmasq --conf-file= --resolv-file=/tmp/r.conf --bind-dynamic
--listen-address=127.0.3.1 --interface=eth0
echo "nameserver 192.168.1.254" > /tmp/r.conf
However, I can't resolve anything if I start dnsmasq as follows (with
"--except-interface=lo").
dnsmasq --conf-file= --resolv-file=/tmp/r.conf --bind-dynamic
--listen-address=127.0.3.1 --interface=eth0 --except-interface=lo
echo "nameserver 192.168.1.254" > /tmp/r.conf
Dnsmasq just doesn't respond even though it's supposedly listening at
127.0.3.1.
> # netstat -nlp | grep :53
> tcp 0 0 127.0.3.1:53 0.0.0.0:* LISTEN
> 5887/dnsmasq
> tcp 0 0 192.168.1.20:53 0.0.0.0:* LISTEN
> 5887/dnsmasq
> tcp6 0 0 fe80::f2de:f1ff:fe6b:53 :::* LISTEN
> 5887/dnsmasq
> udp 0 0 0.0.0.0:5353 0.0.0.0:*
> 768/avahi-daemon: r
> udp 0 0 127.0.3.1:53 0.0.0.0:*
> 5887/dnsmasq
> udp 0 0 192.168.1.20:53 0.0.0.0:*
> 5887/dnsmasq
> udp6 0 0 :::5353 :::*
> 768/avahi-daemon: r
> udp6 0 0 fe80::f2de:f1ff:fe6b:53 :::*
> 5887/dnsmasq
If I start dnsmasq as above but with "--bind-interfaces" instead of
"--bind-dynamic" then the "dig" command works.
Additional info:
> # ifconfig
> eth0 Link encap:Ethernet HWaddr f0:de:f1:6b:22:bf
> inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::f2de:f1ff:fe6b:22bf/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:124343 errors:0 dropped:0 overruns:0 frame:0
> TX packets:59204 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:56834893 (56.8 MB) TX bytes:8614172 (8.6 MB)
> Interrupt:20 Memory:f2500000-f2520000
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:65536 Metric:1
> RX packets:806 errors:0 dropped:0 overruns:0 frame:0
> TX packets:806 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:220819 (220.8 KB) TX bytes:220819 (220.8 KB)
Dnsmasq version: 2.65-1ubuntu1
** Affects: dnsmasq (Ubuntu)
Importance: Undecided
Status: New
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Server Team, which is subscribed to dnsmasq in Ubuntu.
https://bugs.launchpad.net/bugs/1203430
Title:
dnsmasq doesn't listen on a given 127.* listen-address if bind-
dynamic, interface and except-interface options are given
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