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Wireless local area networks (WLANs) provide mobility and convenience to users, the efficiency of todaypsilas WLANs are still far from satisfactory. In this paper discusses the performance of WLANs and wireless ad-hoc networks, our main contribution is analyze several methods to compare the throughput performance on simulation and experimental results. We describe NS-2 (network simulation) implementations for fine-tuning WLAN and wireless Ad-Hoc network parameters such as the physical layer (IEEE802.11) datalink layer (MAC) and network layer (routing protocol) related parameters. Customizing these parameters oppose to using the values specified in the standards will increase throughput and channel utilization under fixed load conditions.