Well when I did a manual dig @75.75.76.76 it timed out half of the
queries. The few responses it gave did seem good. That may not have been
representative though of the overall.

Unfortunately (or fortunately) the issue has stopped happening.

Thank you for your attention to this issue.

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Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/991308

Title:
  DNS Querying fails if any DNS server is unreachable

Status in “dnsmasq” package in Ubuntu:
  New
Status in “network-manager” package in Ubuntu:
  Incomplete

Bug description:
  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

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