Banknifty future today closed at 17680 with loss. Banknifty lost all previous day gains and closed with loss. Volatility is increasing ahead of BREXIT poll, also currency actions due to central bank policies. For tomorrow, watch 17650 level if sustain above it then expect upside for banknifty future for targets 17900 to 18100. Below 17650 expect weak trend and deep downside up to 17200.traders keep long view in banknifty future above 17650 for targets 17900 to 18100. traders can buy banknifty 17900 call options for intraday if future sustain above 17650.