Last time they started getting inside the house, but luckily they haven't reached that stage yet. I've tried those store bought ant poison pellets, and it seemed to have no impact. I've tried making some sugar water and borax solution and it did attract a bunch of ants to the baits, but it seemed to only get half the ants. So half the area is clear of ants (for now) but there is another stream of ants like a metre away that was unaffected.
Have also done something unknowingly but it actually stopped ants from my house l, I always look for their nest or hole and pour very hot water on it and when the place have dried up, I pour oil over it. Works really well