Mobile Ad hoc Network (MANET) consists of wireless mobile nodes that can be set up any time at any place without the requirement of pre-requisite infrastructure. The nodes in these networks have several constraints such as battery power, processing capability and bandwidth. Moreover each node in MANET has to act as a relay node for others for the successful network operations. In an ideal environment in spite of above mentioned limitations, the node performs this community task faithfully but as in real world there exists nodes with selfish attitude also. Therefore, this paper is an effort to evaluate the efficacy of network with nodes having such behavior prevailing in realistic environment. Various researchers have evaluated the network performance in idealistic conditions but none has made an effort to evaluate it in practical condition such as in presence of obstacles. To make the scenario realistic different number, type and shape of obstacles were taken. The work was accomplished by designing a simulator in MATLAB-11.