Abstract: Most of the studies in ad hoc networks assume that 802.11 is the used protocol on low layers. For a couple of years, some studies have extracted different performance issues with 802.11 in ad hoc networks. These problems result in a great unfairness in the long and the short term and in an overall performance loss. Most of these studies are based on simulation results and these performance issues have almost never been tackled from the angle of real experiments. In this paper, we experiment different ad hoc configurations that present some performance problems. We focus on the fairness issue. We show that some problems appear even if the effects are sometimes softened, whereas some others are nonexistant.