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Why Sophos UTM software is slower than Sophos UTM hardware

Mohamed Hassan

Hi Guys,

I've been having this ongoing weird issue with my internet using my Sophos UTM for years and so far have been unable to find root cause.


I'm running Sophos Home UTM as a VM on Hyper-V host with 2GBs of RAM and 2 vCPU which's enough for my home (2 users).


So I have 50 Mbps VDSLwhich basically phone line goes to a modem on bridged mode then to my Hyper-V server which then my UTM does PPPoE. I have this setup from 2015.


This works perfectly fine however my only problem is when I use my ISP provided modem as main modem or any other modem directly as gateway and no Sophos UTM I get better internet speed. When I say speed I'm not talking about download or speed test, I'm talking about browsing and streaming. When using Sophos UTM as my gateway my internet is 2-3 times slower when it comes to streaming or browsing than using a modem directly. Even though if I do speed test I get same results.

For example if I connect my IPTV to my mobile hotspot which has higher latency than my home internet it doesn't buffer but if I connect to my home network which has Sophos UTM as gateway it buffers. But if I'm not using Sophos UTM and using my modem directly again it doesn't buffer.


So to me it sounds like Sophos UTM slows down my internet. In my Sophos I don't have much settings/rules and nothing that would affect speed or does does traffic shaping. I'm using fastest DNS to me as forwarder in Sophos. Using only couple of firewall rules. Not using QoS. My Sophos always up to date. Sophos VM has enough resources and running on SSD. I tried to double up resources but no difference. I reboot the VM regularly. I don't use Application Control. Recently I have rebuilt my entire Sophos from a new image and manually re created settings. It's not that my WiFi network is saturated I get same slow experience when using cable on gigabit switch. I tried many other modems as bridged and same slowness result. Sophos VM is on 2x 1gb dedicated nics on Hyper-V so not a network congestion.


This issue doesn't exist on Sophos UTM hardware as I run it for my clients but does that mean Sophos UTM doesn't run well as virtualized? 

 

Cheers
Mo



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  • 0

    Hi  

    Have you enabled IPS or DoS Protection? There is a flood rate which limits bandwidth sometimes and causes slow performance. There's also a matter of Stateful Firewall inspection compared to plain Router/Modem. I would suggest you check this amazing guide for Sophos UTM by Bob.

    Regards

    Jaydeep

  • 0

    Hi Mo,

    I suspect that you will want to study #7 in the post Jaydeep linked you to.  Item 7. in #7 is my first guess, but go through the steps in order.  If you're using ESXi, be sure you use only VMXNET3 virtual NICs.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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