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Sophos XG 17.5 and Slow Downloads with Intrusion Prevention active

Björn Ebner

I do have the impression, that Downloads a slower with Sophos XG 17.5 than with previous Versions.

When I do a speedtest (my WAN Speed is 100/40) I only get about 40/30.

I tried Speedtest on Speedtest.net from a Cabled PC.

When performing the Speedtest the CPU gets to about 90 - 100 % mostly used by IPS (Snort)

I think that this wasn't like this before Sophos XG 17.5 in previous Versions.

When I disable Intrusion Prevention I do get normal speeds.

Any idea?

Update:

I tested it also with a Sophos XG 115 on 200/100 WAN with IPS activated but there I couldn't see this issue.



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  • 0 in reply to Björn Ebner

    Hi Bjoern,

    I have some more things to look at.

    I tried changing my ISP setting to the default LAN to WAN and the change made no different to my 100/40 download. I did create my own IPS policy by removing all the signatures for not needed systems eg line, mail server, windows servers etc.

    What is the CPU on your XG?

    Please review the Reports -> Network and threats tab to see if there are any specific IPS rules that are being triggered?

    Other that I am running out of ideas and will need to have one of the more technical mods review your posts.

    Ian

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