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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.

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  • 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.

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