[Dnsmasq-discuss] About 127.0.0.1 in resolv.conf [WAS: Web hang ups after repeated access to one site - dnsmasq related?]

[Max Barry]

Simon Kelley wrote:
> Hugo Heden wrote:
>> But what happens if dnsmasq then
>> forwards a ("non-local") dns-query to 127.0.0.1, i.e to itself? Could
>> that not result in some kind of infinite loop weirdness?
> 
> dnsmasq knows that it's listening on 127.0.0.1 so it's clever enough not 
> to forward requests there.

Hello! Sorry to gravedig, but I'm having this problem: dnsmasq listens 
on 127.0.0.1 and forwards requests to itself.

 From /var/log/daemon.log:

Oct 15 09:24:35 eve dnsmasq[2396]: started, version 2.47 cachesize 150
Oct 15 09:24:35 eve dnsmasq[2396]: compile time options: IPv6 GNU-getopt 
DBus I18N TFTP
Oct 15 09:24:35 eve dnsmasq[2396]: no servers found in /etc/resolv.conf, 
will retry
Oct 15 09:24:35 eve dnsmasq[2396]: read /etc/hosts - 16 addresses
Oct 15 09:24:41 eve NetworkManager: <info>  starting...
...snip...
Oct 15 09:24:49 eve NetworkManager: <info>    address 192.168.0.2
Oct 15 09:24:49 eve NetworkManager: <info>    prefix 24 (255.255.255.0)
Oct 15 09:24:49 eve NetworkManager: <info>    gateway 192.168.0.1
Oct 15 09:24:49 eve NetworkManager: <info>    nameserver '127.0.0.1'
Oct 15 09:24:49 eve NetworkManager: <info>    nameserver '61.9.134.49'
Oct 15 09:24:49 eve NetworkManager: <info>    nameserver '61.9.133.193'
Oct 15 09:24:49 eve NetworkManager: <info>    nameserver '208.67.222.222'
Oct 15 09:24:49 eve NetworkManager: <info>    nameserver '208.67.220.220'
Oct 15 09:24:49 eve NetworkManager: <info>    nameserver '192.168.0.1'
Oct 15 09:24:49 eve NetworkManager: <info>    domain name 
'vic.bigpond.net.au'
Oct 15 09:24:49 eve NetworkManager: <info>  Activation (wlan1) Stage 5 
of 5 (IP Configure Commit) scheduled...
Oct 15 09:24:49 eve NetworkManager: <info>  Activation (wlan1) Stage 4 
of 5 (IP Configure Get) complete.
Oct 15 09:24:49 eve NetworkManager: <info>  Activation (wlan1) Stage 5 
of 5 (IP Configure Commit) started...
Oct 15 09:24:51 eve NetworkManager: <info>  (wlan1): device state 
change: 7 -> 8
Oct 15 09:24:51 eve dnsmasq[2396]: reading /etc/resolv.conf
Oct 15 09:24:51 eve dnsmasq[2396]: using nameserver 208.67.220.220#53
Oct 15 09:24:51 eve dnsmasq[2396]: using nameserver 208.67.222.222#53
Oct 15 09:24:51 eve dnsmasq[2396]: using nameserver 61.9.133.193#53
Oct 15 09:24:51 eve dnsmasq[2396]: using nameserver 61.9.134.49#53
Oct 15 09:24:51 eve dnsmasq[2396]: using nameserver 127.0.0.1#53

Note the line above. If I manually restart dnsmasq, that line instead 
looks like "dnsmasq[3853]: ignoring nameserver 127.0.0.1 - local 
interface". But each time I turn on my computer each day, and dnsmasq 
starts automatically, it's as per the above, and it listens to the local 
interface:

Oct 15 09:25:49 eve dnsmasq[2396]: query[A] www.bom.gov.au from 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: forwarded www.bom.gov.au to 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: query[A] weather.noaa.gov from 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: forwarded weather.noaa.gov to 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: query[A] ntp.ubuntu.com from 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: forwarded ntp.ubuntu.com to 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: query[A] imap.gmail.com from 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: forwarded imap.gmail.com to 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: query[A] ntp.ubuntu.com from 127.0.0.1
Oct 15 09:25:49 eve dnsmasq[2396]: forwarded ntp.ubuntu.com to 127.0.0.1

These requests time out, making everything very slow.

$ more /etc/resolv.conf
# Generated by NetworkManager
domain vic.bigpond.net.au
search vic.bigpond.net.au
nameserver 127.0.0.1
nameserver 61.9.134.49
nameserver 61.9.133.193
# NOTE: the libc resolver may not support more than 3 nameservers.
# The nameservers listed below may not be recognized.
nameserver 208.67.222.222
nameserver 208.67.220.220

This problem only began after I started using NetworkManager on Ubuntu 
(previously I had manually configured /etc/network/interfaces).

Any help appreciated!

Max.