I tried nearly every safe, old, organic trick I read for the ant problem here at the farm....including cinnamon inside, which has stained all the woodwork and tile backsplash in the kitchen. The only thing that ever helped me was Terro Outdoor Ant Killer in the orange bag from Walmart/Lowes/etc.
You walk around the house shaking the pellets out of the holes in the bottom of the bag every 6 weeks or so. NO ants.
Jan in VA