Returning to this issue....
Consider the log in comment #10. A successful lookup is done.
> Jun 22 13:43:09 archon dnsmasq[9635]: query[A] slashdot.org from 127.0.0.1
> Jun 22 13:43:09 archon dnsmasq[9635]: forwarded slashdot.org to 75.75.75.75
> Jun 22 13:43:09 archon dnsmasq[9635]: reply slashdot.org is 216.34.181.45
Later an unsuccessful one is done.
> Jun 22 13:46:00 archon dnsmasq[9814]: query[A] gmail.com from 127.0.0.1
> Jun 22 13:46:00 archon dnsmasq[9814]: forwarded gmail.com to 75.75.75.75
> Jun 22 13:46:00 archon dnsmasq[9814]: forwarded gmail.com to 75.75.76.76
It looks as if *both* nameservers are failing to respond in the latter
case.
It was originally reported that one out of four queries fails. This is
the failure frequency one would get if each nameserver failed half the
time and the servers fail independently of each other. William reported
in comment #6 that one of the nameservers, 75.75.76.76, fails half the
time. Is it possible that the other nameserver is also failing half the
time?
More generally, William, have you learned anything new about the problem
in the past month and a half?
** Changed in: dnsmasq (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/991308
Title:
Dnsmasq fails to resolve if any upstream nameserver is unreachable
Status in “dnsmasq” package in Ubuntu:
Incomplete
Status in “network-manager” package in Ubuntu:
Invalid
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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