def nameservers=(ns=Resolv::DNS::Config.new.nameservers)
			@sockets.each do |s|
				s.close
			end
			@sockets = []
			ns.each do |ip,port|
				sock = UDPSocket.new
				sock.connect(ip,port)
				@sockets << sock
				break # let's just the first nameserver in this version of the library
			end
			@socket_index = 0
		end
def nameservers=(ns=Resolv::DNS::Config.new.nameservers)
			@sockets.each do |s|
				s.close
			end
			@sockets = []
			ns.each do |ip,port|
				sock = UDPSocket.new
				sock.connect(ip,port)
				@sockets << sock
				break # let's just the first nameserver in this version of the library
			end
			@socket_index = 0
		end
initialize a new DNSBL::Client object
 the config file automatically points to a YAML file containing the list of DNSBLs and their return codes
 the two-level-tlds file lists most of the two level tlds, needed for hostname to domain normalization
 sets the nameservers used for performing DNS lookups in round-robin fashion