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Internet speed slow after few hours

Hi,

I noticed weird behaviour of my Sophos XG firewall (Home Edition 17.1.1 MR-1, installed directly on PC with intel i5 CPU and 8GB ram). My internet speed from ISP is 100Mbps, I will only get 100Mbps speed after I reboot the Sophos, but after using it for few hours (roughly around 2-3 hours) the speed drops to around 15-17Mbps. I tested it few times using the reboot methods, the results are the same. All my tests are without enabling any UTM services, means allow any to any connections & disable IPS, Web policies, Traffic Shaping and Application Control also using direct cable connection from my laptop to Sophos LAN interface. Any idea what could cause the speed drops?

Remarks:

1) Tested using other small router, I'm getting consistent 98-100Mbps speed.

2) I am using Intel PRO/1000MT dual port server adapter as my network card.

3) Set interface speed to 1000Mbps - Full duplex (MTU 1500) on both WAN & LAN.

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sachingurung over 6 years ago

Hi,

Check #4-#4.2 in my troubleshooting guide to get an insight. Monitor the System Graphs available under Reports > System Graphs section, and make a note if there is a spike in memory usage, interface usage or high CPU, during the time when this issue prevails.

Thanks,

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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sachingurung over 6 years ago

Hi,

Check #4-#4.2 in my troubleshooting guide to get an insight. Monitor the System Graphs available under Reports > System Graphs section, and make a note if there is a spike in memory usage, interface usage or high CPU, during the time when this issue prevails.

Thanks,

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
Remember to like a post. If a post (on a question thread) solves your question use the 'This helped me' link.
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obie over 6 years ago in reply to sachingurung

Hi,

Thank you for the reply. My CPU barely can go 5%, memory around 30% most of the time. But I can see dropped packets as shown in my screenshot which I am not really good in reading it. Also, I don't think that this issue cause by other devices because I use the same device like modem or even cables with different router and the result is consistent 90-100Mbps.

Thanks,
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