Hmm, not exactly #1003842, since you don't have the problem that some
nameservers are "screening off" others with NXDOMAIN.
The worst we can say about dnsmasq in this context is that it could
behave better in the case where several listed upstream nameservers are
unreachable.
** Also affects: dnsmasq (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/979067
Title:
DNS unresponsive/slow when different DNS are provided by wifi and
wired connected to different networks
Status in “dnsmasq” package in Ubuntu:
New
Status in “network-manager” package in Ubuntu:
Confirmed
Bug description:
My computer happens to be connected to two networks through eth0 and
wlan0. NetworkManager connects to both of them automatically and use
DHCP for both of them. Both networks are protected from the outside by
firewalls and they are lots of DNS servers (obtained automatically).
Since the upgrade to Precise, DNS no longer works without manual
intervention.
What happens is that, since bug #903854, dnsmasq no longer receives
the option --strict-order. As a consequence, it tries servers in a
random order to resolve DNS requests. In particular, it tries to
access DNS servers from the wireless network through the eth0 route,
which crosses a firewall, and therefore it fails to resolve requests.
It takes a lot of failures before all the unreachable servers have
been exhausted, which makes for a poor user experience.
With the --strict-order option, dnsmasq tries to access servers that
can be accessed by the default route, which succeeds immediately. Note
that I am not sure that --strict-order is the proper fix and it may
only be papering over a real bug, but at least it does fix the issue.
network-manager: 0.9.4.0-0ubuntu2
dnsmasq-base: 2.59-4
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