Nifty - 17680 need to be exceeded for continuation of upmove.
17680-17730 area need to be crossed and sustained for comfort with long side trades. Besides being high of today (25/08) and 22/08, 17680 is Ichimoku's Tanken Sen level.
17376, 17738, 17216, 17155, 17094, 17018 are important support levels.