[Dnsmasq-discuss] local-service feature not working as expected

[T o n g]

On Sat, 31 Jan 2015 15:32:46 +0000, T o n g wrote:

> On Sat, 31 Jan 2015 03:44:26 +0000, T o n g wrote:
> 
>>> I following the following to config dnsmasq as DHCP and DNS server
>>> http://sfxpt.wordpress.com/2013/11/30/dnsmasq-installation-
>>> configuration-5/
>>> 
>>> It works well till Ubuntu 13.10. However, with Ubuntu 14.10, the dns
>>> query from localnetwork will always timeout...
>> 
>> Just for the archive, I've found the problem...
>> 
>> I.e., that `--listen-address=127.0.1.1` will willfully ignore any dns
>> queries from local network. This is the exact reason causing the
>> symptom that I reported above. More details at
>> https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1414887/
> comments/2
> 
> I fixed the above problem and now my dnsmasq is starting like this:
> 
>   dnsmasq  12608     1  0 09:45 ?        00:00:00 /usr/sbin/dnsmasq -x /
> var/run/dnsmasq/dnsmasq.pid -u dnsmasq -7
> /etc/dnsmasq.d,.dpkg-dist,.dpkg-
> old,.dpkg-new --local-service
> 
> However, I think that `local-service` feature is not working as expected
> because when I was querying from local network, I still get timed out:
> 
> ```
> $ dig @192	.	168.2.122 google.ca 
> 
> ; <<>> DiG 9	.	9.5-4.3-Ubuntu <<>> @192.168.2.122 google.ca
> ; (1 server found)
> ;; global options: +cmd
> ;; connection timed out; no servers could be reached
> ```

> service dnsmasq stop
>  * Stopping DNS forwarder and DHCP server dnsmasq                 [ OK ]
> 
> /usr/sbin/dnsmasq -x /var/run/dnsmasq/dnsmasq.pid -u dnsmasq -7 /etc/
> dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new &
> ```
> 
> From another machine:
> 
> ```
> $ dig @192.168.2.122 google.ca 
> ...
> ;; ANSWER SECTION:
> google.ca.              300     IN      A       173.194.43.87
> ...
> ;; Query time: 62 msec
> ;; SERVER: 192.168.2.122#53(192.168.2.122)
> ;; WHEN: Sat Jan 31 10:12:00 EST 2015
> ;; MSG SIZE  rcvd: 248
> 
> $ ifconfig 
> eth0      Link encap:Ethernet  HWaddr 00:...:ef  
>           inet addr:192.168.2.64  Bcast:192.168.2.255  Mask:255.255.255.0
> ```
> 
> The only difference is with or without that `local-service`. But
> wouldn't `local-service` be meant for localnetwork query to be OK?
> 
>        --local-service
>           Accept DNS queries only from hosts whose address is on  a 
>           local subnet, ie a subnet for which an interface exists on the
>           server.
> 
> 192.168.2.64 and 192.168.2.122 are sure on the same local subnet.
> 
> Comments?

Here is the network configuration of the machine running dnsmasq:

% ifconfig 
eth0      Link encap:Ethernet  HWaddr 00:...:8c  
          inet addr:192.168.2.122  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::...:d08c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2172 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1686 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:696161 (696.1 KB)  TX bytes:168402 (168.4 KB)
          Interrupt:16 

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:5967 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5967 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1594629 (1.5 MB)  TX bytes:1594629 (1.5 MB)

wlan0     Link encap:Ethernet  HWaddr 00:...:09  
          inet addr:192.168.2.74  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::...:609/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12049 errors:0 dropped:0 overruns:0 frame:0
          TX packets:257 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3969955 (3.9 MB)  TX bytes:41687 (41.6 KB)

It's a vanilla Ubuntu 14.10, with a vanilla dnsmasq installation:

% cat /etc/dnsmasq.conf /etc/dnsmasq.d/network-manager | sed '/^$/d; /^#/d'
bind-interfaces

Thanks