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  1. #1

    Bandwith control sg108E v2

    Model :

    Hardware Version :

    Firmware Version :

    ISP : [/COLOR]

    Firs of all, sorry for my bad english :s

    I bought a sg 108E v2 and i'm having some issue with it's bandwith control.
    I have 250Mb/20Mb and I'm trying to limit port 2 download to 240Mb (240*1024 = 245760) but when I test that config using speedtest.net the maximum download speed is about 50~60Mb. If I remove all bandwith control configurations I can download using 250Mb.

    1.0.2 Build 20160526 Rel.34615

  2. #2
    Members R1D2 is on a distinguished road
    Join Date
    Dec 2015
    Speedtest.net is the most inaccurate speed test I've ever seen. I'll show you why:

    With my test setup 150Mbit/s downstream / 20 Mbit/s upstream over a TL-SG108E I get following speedtest.net results:

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    Let's compare this with results from much more accurate dslreports.com speed test:

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    Now lets limit bandwidth in TL-SG108E to 10 Mbit/s ingress / 40 Mbit/s egress:

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    With speedtest.net I now get:

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    WTF?! Lets try dslreports.com speed test:

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    Much better, but still not accurate.

    Now lets do a real speed test: using iperf running on a system connected to TL-SG108E's port 2 and its counterpart running on a server in the LAN:

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    As you can see, bandwidth limiting in TL-SG108E v2 just works fine (the initial spike in the diagram above is caused by the laptop's OS which buffers data and reports it to the iperf application as being sent while it actually has not been sent over the wire yet).

    So if you want to use a web-based speed test, which might not always be accurate purely due to its nature (too much influence by lots of factors such as current traffic on their servers, method being used - keep away from Flash-based tests! -, ISP's traffic at the moment etc. etc.), use the speed test at dslreports.com. IMHO it's the most accurate and you will get some other interesting figures beside speed such as buffer bloat and ratings compared to average results for a given connection type (fiber, cable, DSL, WiFi) achieved by other people.
    Last edited by R1D2; 03-08-2018 at 23:28.

  3. #3
    Thanks for your reply.
    I'll try this dslreports.com and iperf (didn't know this application) and report back to this thread with my result.

  4. #4
    Members R1D2 is on a distinguished road
    Join Date
    Dec 2015
    You're welcome. iperf is the standard method to measure throughput in TCP/IP networks. Current version is iperf3, see http://software.es.net/iperf/


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