@Jamie
I think this explains the behavior I often see when enabling WiFi and it
auto-connects to a known AP. NM shows the connection as active ( ie.
nmcli d ), the routing table it correct, pinging an IP address works,
however for the first 30-90s after the connection comes up, DNS lookups
fail. I think this is one of the underlying causes of users complaining
about networking failing when they activate WiFi on Touch devices.
That said, unwinding this may be a bit tricky as NM keeps both
connections active, but sets WiFi as the default route. As the DNS
Servers were added in order to dnsmasq, and unwinding this in NM might
be tricky, I wonder if patching this in dnsmasq is the right way to go?
I'll do some investigation of dnsmasq's DBus API. If we changed
dnsmasq to reverse the ordering of DNS servers. The only issue here is
whether all of the DNS servers for an interface are added as group or
not. If they're added individually, then reversing the order would have
the effect of reversing the individual DNS servers for a particular
interface too, which might not be desired behavior.
** Also affects: network-manager (Ubuntu RTM)
Importance: Undecided
Status: New
** Also affects: canonical-devices-system-image
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1270189
Title:
Ubuntu Touch devices are using cellular DNS servers over wifi
connection
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