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A recent change to prevent containers only connected to --internal networks from communicating with external DNS servers inadvertently prevented the daemon's internal DNS server from forwarding requests within an internal network to a containerised DNS server. Relax the check, so that only requests that need to be forwarded from the host's network namespace are dropped. External DNS servers remain unreachable from the internal network. Signed-off-by: Rob Murray <rob.murray@docker.com>