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gumu
gumu
New Member
June 3, 2019
Solved

Upload speed greater than download speed

  • June 3, 2019
  • 1 reply
  • 13490 views

I noticed when I do a speed test my upload speed is always greater than my download. I'm new to FortiGate pls help me with a  solution. 

    Best answer by Toshi_Esumi

    If you're load-balancing between two circuits and run a speed test with a server on the internet, likely it's testing only one side since the source&destination is a same set of IPs. But besides that I would run speed test by shutting down one ISP circuit to get a consistent measurable outcome. 

    Anyway, I have to assume like one ISP circuit is 80Mbps down/20Mbps up, and you get 0.1K-2Mbps down/16Mbps up in the speed test. Then most likely a duplex-mismatch is happening on the path between ISP circuit and your machine running the test. 

    There are many discussion in this forum about this subject. Search discussions with "duplex mismatch", and you can find the mechanism how it happens and how to find where the point(s) is(are). On the FGT side, to find how it's operating is "diag hardware deviceinfo nic <interface_name>". You always need to check on the other side as well.

     

    1 reply

    Toshi_Esumi
    SuperUser
    Toshi_Esumi
    SuperUser
    June 3, 2019

    You need to provide more information to get any comments, like what's the circuit speed, is that larger than circuit speed, is download speed lower than it should be, how much greater, and so on.

    gumu
    gumuAuthor
    New Member
    June 4, 2019

    toshiesumi wrote:

    You need to provide more information to get any comments, like what's the circuit speed, is that larger than circuit speed, is download speed lower than it should be, how much greater, and so on.

    We are using Two ISP's with a total combined bandwidth of 160Mbps. The download speed I get between 0.1kbps to a maximum of 2mbps while the upload speed is going up to 16mbps. Pls what might be the problem.

    Toshi_Esumi
    SuperUser
    Toshi_EsumiAnswer
    SuperUser
    June 5, 2019

    If you're load-balancing between two circuits and run a speed test with a server on the internet, likely it's testing only one side since the source&destination is a same set of IPs. But besides that I would run speed test by shutting down one ISP circuit to get a consistent measurable outcome. 

    Anyway, I have to assume like one ISP circuit is 80Mbps down/20Mbps up, and you get 0.1K-2Mbps down/16Mbps up in the speed test. Then most likely a duplex-mismatch is happening on the path between ISP circuit and your machine running the test. 

    There are many discussion in this forum about this subject. Search discussions with "duplex mismatch", and you can find the mechanism how it happens and how to find where the point(s) is(are). On the FGT side, to find how it's operating is "diag hardware deviceinfo nic <interface_name>". You always need to check on the other side as well.

     

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