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Internet Speed Drops Drastically When Adding a Switch

Mark PCF

We have fiber internet with 50Mbps up/down and we normally get between 40-50 depending on network load.

When I add an un-managed switch between our Sophos SG 310 and the Telco equipment, speed drops down to below 10Mbps up/down. I have tried 2 different switches and several patch cables wit the same result. Speeds return to normal when I plug the Telco connection back directly into the WAN port of the UTM.

We are adding the switch in preparation to adding a second SG 310 for HA.



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  • 0

    Often we see a duplex mismatch as source of this problem.

    If speed is fixed at UTM or provider-router ... you have to select a fix speed at the other end of the cable too.


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

  • 0 in reply to dirkkotte

    I was hoping this was it singe the switch we put in was an unmanaged Gigabit and the UTM was set to 100Mbps/fullduplex.

    Same problem remained when I replaced the Gigabit switch with a basic 10/100 though.

  • 0 in reply to Mark PCF

    i think your unmanaged switches need "auto" settings at all ports.


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

  • 0 in reply to Mark PCF

    Hi Mark and welcome to the UTM Community!

    If Dirk's last suggestion doesn't fix things for you, experiment as suggested in #7.7 in Rulz (last updated 2019-04-17).

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • 0 in reply to BAlfson

    Unfortunately, Dirk's suggestions did not work. The switch I am trying to use is a TP-Link TL-SG1016 gigabit switch and all ports are auto detecting (will connect at gigabit with a laptop). The UTM is set for 100 Mbps/full-duplex to match the NIC on the incomming fiber connection.

    I still get the full 50/50Mbps up/down when directly connected, but anytime I put the switch between, the speed drops down to between 2-5Mbps. The switch indicates that the connection is using 100Mbps (The gigabit light is out on the 2 ports connected to the UTM and fiber equipment).

    I will have to to the testing suggested early in the morning before most people get in to limit the network bottleneck while I am testing.

    I will post what I find.

  • 0 in reply to Mark PCF

    Good luck, but I bet you wind up getting a different switch.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • 0 in reply to Mark PCF

    I bought a TPLINK firewall because it was cheap, and got what I paid for.   No support for the encryption options that are considered minimal-acceptable based on recent research.   Called their support to see if there was a better option, and got a nice lady with a Chinese accent would could not understand my version of English.

    You will not have acceptable performance if a fixed link is matched to an auto-detect link, because the auto-detect side will activate half-duplex.   The duplex mode is not part of the auto-discover mechanism.

    In your case, it sounds like you have a duplex problem on both ends - utm to switch and switch to ISP.    If you can get your ISP to switch to auto mode, you can make this work.

  • 0 in reply to DouglasFoster

    Good idea, thank you for the suggestion!

  • 0 in reply to Mark PCF

    First i would try to configure the UTM with "auto" settings. This should match the switch settings.

    If the problem is at the fiber-side ... you need another switch.

    Or ask your ISP to configure the fibre-switch with "Auto"-settings too.

    Sometimes this is possible.

     


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

Reply
  • 0 in reply to Mark PCF

    First i would try to configure the UTM with "auto" settings. This should match the switch settings.

    If the problem is at the fiber-side ... you need another switch.

    Or ask your ISP to configure the fibre-switch with "Auto"-settings too.

    Sometimes this is possible.

     


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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