[Bug 991308] Re: DNS Querying fails if any DNS server is unreachable

[Guillaume Melquiond]

No, that's the contrary, they reply too fast, in a sense. If you look at
the log I posted, dnsmasq does receive some kind of reply from the
unreachable nameservers. I don't know whether this is a crafted reply by
the firewall or whether the query actually reached the nameserver but it
replied with some kind of failure because the query did not come through
the proper route. If you are interested, I can capture a dump of the
packets the next time I'm on these networks. Anyway, as I currently
understand it, all the nameservers queried by dnsmasq are replying
somehow, and dnsmasq only considers the first reply. As a consequence,
there is a race between the servers, so DNS resolution will succeed only
if the properly routed server replies the fastest.

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Title:
  DNS Querying fails if any DNS server is unreachable

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