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  • Content created by Rene Molenaar (CCIE #41726)


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Forum Replies

  1. Hi Rene,

    I saw that you double the window size to 128000 and 256000 etc, and I know that window size filed on TCP header with size of 16 byte which mean the maximum window size = 65536 bits ( maximum IP packet size ), so how is it possible to double up over than that value ??

  2. Rene/ Andrew, I came across that CISCO can be used and iperf client and server for testing such tests? Any insight? or usable link?

  3. You can use Iperf to test optimal window sizes yes, that’s what I did in this lesson:

    Cisco VIRL allows you to add delay to interfaces so you can simulate satellite links:

    I haven’t tested this before but it might be nice to try.

  4. Hello

    If I have understood the previous lessons on TCP correctly, it increases and decreases the window size dynamically according to network conditions. If that’s the case, what is the purpose of knowing the optimal window size for a network, given that it should figure that out dynamically?
    Not sure if I have misunderstood…


  5. Hi Rene

    On the bandwidth delay product your conversion from ms to second is not correct.
    You converted 1ms to 0.01 seconds, this is not correct.
    1ms =0.001seconds


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