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Google's DNS servers are currently used by containers on the default bridge network, when none of the host's /etc/resolv.conf nameservers are usable (host loopback addresses that the container can't see). But, if a server is supplied via the --dns option, it'll just appear in the container's resolv.conf (on the default bridge) or as an upstream server for the internal resolver. So, fix the networking-intro page's description, noting that requests to --dns servers happen in the container's namespace. Signed-off-by: Rob Murray <rob.murray@docker.com>