Mobile　ad-hoc　network　(MANET)　is　a　set　of　movable　hosts　established　without　existing　network　infrastructure　and　can　be　self-organized　dynamically.　MANET　protocols　have　faced　big　challenges　due　to　dynamic　changing　network　topology　and　asymmetric　network　link.　In　this　paper,　we　simulate　AODV,　DSDV,　DSR　routing　protocols　in　network　simulator　NS-2　and　evaluate　and　compare　the　performance　metrics　for　each　routing　protocol　using　packet　delivery　ratio,　average　end　to　end　delay　of　packets　and　normalized　routing　overhead.　We　conduct　the　simulation　by　varying　the　sending　rate　of　source　node　(2　packets/s　and　4　packets/s)　with　different　pause　time　using　node　movement　model　and　cbr　source　traffic　model.