6 Replies Latest reply: Oct 20, 2015 11:31 AM by Aref - CCIE #62163 (Security) / CCNPx2 (R&S - Security) / Network+ / Security+ RSS

    Router throughput and window size




      I have built a small lab to study towards the CCNA


      My question is this :


      I am using jperf to measure throughput from a PC on a 2950 sw through a 2821 router  to another PC on a 2nd 2950


      Everthing is set a 100/ full however I get slightly less than 50M/b throughput, if I connect the PC's back to back on the same switch I get

      aroung 95M/B through put.


      I cannot see why this should happen, can anyone suggest a reason / cure ?


      Thanks ,Dave