# File lib/Dnsruby/Recursor.rb, line 167
    def initialize(res = nil)
      if (res)
        @resolver = res
      else
        if (defined?@@nameservers && @@nameservers.length > 0)
          @resolver = Resolver.new({:nameserver => @@nameservers})
        else
          @resolver = Resolver.new
        end
      end
      @ipv6_ok = false
    end