Public bug reported:

Release: 12.04
Hardware: HP Compaq 6910p Laptop

If the backup DNS server is unreachable, dnsmasq does not try to reach
primary DNS server.

In the following default configuration (clean install of 12.04) 1 out of
4 DNS queries fail. (DNSMasq seems to rotate queries between the listed
servers)

wlightning@archon:~$ cat /run/nm-dns-dnsmasq.conf 
server=75.75.75.75
server=75.75.76.76
wlightning@archon:~$ 


wlightning@archon:~$ cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1
search hsd1.or.comcast.net
wlightning@archon:~$ 


wlightning@archon:~$ nm-tool

NetworkManager Tool

State: connected (global)

- Device: ttyUSB0 --------------------------------------------------------------
  Type:              Mobile Broadband (CDMA)
  Driver:            sierra
  State:             disconnected
  Default:           no

  Capabilities:


- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwl4965
  State:             unavailable
  Default:           no
  HW Address:        00:1D:E0:35:69:AF

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points


- Device: eth0  [Wired connection 1] -------------------------------------------
  Type:              Wired
  Driver:            e1000e
  State:             connected
  Default:           yes
  HW Address:        00:1B:38:E7:F5:02

  Capabilities:
    Carrier Detect:  yes
    Speed:           1000 Mb/s

  Wired Properties
    Carrier:         on

  IPv4 Settings:
    Address:         10.0.0.11
    Prefix:          24 (255.255.255.0)
    Gateway:         10.0.0.1

    DNS:             75.75.75.75
    DNS:             75.75.76.76


wlightning@archon:~$ 

mtr of 75.75.75.75 (anycast addr):
                                       My traceroute  [v0.80]
archon (0.0.0.0)                                                           Sun 
Apr 29 10:13:58 2012
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                           Packets              
 Pings
 Host                                                    Loss%   Snt   Last   
Avg  Best  Wrst StDev
 1. 10.0.0.1                                              0.0%    51    0.6   
0.6   0.6   1.5   0.2
 2. 73.94.124.1                                           0.0%    51    9.0   
9.2   7.1  14.7   1.5
 3. 68.85.148.1                                           0.0%    51    7.9  
10.6   7.4  24.7   4.0
 4. 68.87.216.13                                          0.0%    51    9.2  
19.8   8.5 150.8  29.0
 5. 68.87.218.162                                         0.0%    50   10.8  
14.1   8.1  85.0  13.4
    68.87.218.158
 6. 68.87.216.41                                          0.0%    50    9.5  
13.2   9.5  67.4   8.6
 7. 75.75.75.75                                           0.0%    50    9.9  
11.0   9.1  17.2   1.8

mtr of 75.75.76.76 (anycast addr):
                                       My traceroute  [v0.80]
archon (0.0.0.0)                                                           Sun 
Apr 29 10:12:42 2012
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                           Packets              
 Pings
 Host                                                    Loss%   Snt   Last   
Avg  Best  Wrst StDev
 1. 10.0.0.1                                              0.0%    51    0.6   
0.8   0.5   3.6   0.5
 2. 73.94.124.1                                           0.0%    51    9.0   
9.3   7.0  18.3   2.5
 3. 68.85.148.9                                           0.0%    51    7.3   
9.6   7.2  22.3   2.9
 4. 68.85.243.253                                         0.0%    51    8.3  
13.8   7.5  81.9  15.6
 5. 68.86.95.97                                           0.0%    51   14.5  
17.2  11.9  33.0   4.4
    68.86.91.197
    68.86.90.213
    68.86.95.93
    68.86.95.89
 6. 68.86.95.214                                          0.0%    51   39.5  
41.5  38.1  74.5   6.4
 7. 68.86.199.130                                         0.0%    51   51.9  
40.8  38.2  55.3   3.3
 8. 75.75.76.76                                          44.0%    50   38.5  
40.2  38.3  46.2   2.2

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: comcast dnsmasq network-manager redundency resolv.conf

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https://bugs.launchpad.net/bugs/991308

Title:
  DNS Querying fails if any DNS server is unreachable

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