I can confirm that Mac OS X at least does this (it only queries the resolvers of your highest priority IPv4 interface as defined by the 'Set Service Order' option in the Network section of System Preferences). No beer required for sharing this feedback ;) Pete On 11/06/2013, at 8:41 PM, Nathan Ward wrote:

If you receive (via DHCP) a DNS server over the wireless network, are modern operating systems intelligent enough to only send queries to that DNS server out that interface?