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Increase in Ping when running speed test

deputycag

I have been testing out my Sophos XG firewall v16.  I have also ran this test with other software firewalls like Untangle and Sophos UTM just to  make sure it was not anything else.  

I ping Google DNS continuously.  Then I run a speedtest using http://www.speedtest.net/.  When the test starts to run I notice the pings increasing as shown below.  This only happens to Sophos XG.  Does not happen to UTM version or any other software.    I have tried to disable everything on Sophos XG.  No IPS,  No Antivirus or Web filtering.  Oh this also happens at two different locations.  One is  Sophos XG installed to HP Server.  The other is Sophos XG installed to vmware esxi.   

Anyone has any ideas?  It seems to me that under heavy bandwidth (115mbps) the sophos XG starts to slow down.  Sometimes the pings will reach 500-600ms.  

Reply from 8.8.8.8: bytes=32 time=7ms TTL=58
Reply from 8.8.8.8: bytes=32 time=10ms TTL=58
Reply from 8.8.8.8: bytes=32 time=7ms TTL=58
Reply from 8.8.8.8: bytes=32 time=8ms TTL=58
Reply from 8.8.8.8: bytes=32 time=7ms TTL=58
Reply from 8.8.8.8: bytes=32 time=9ms TTL=58
Reply from 8.8.8.8: bytes=32 time=8ms TTL=58
Reply from 8.8.8.8: bytes=32 time=7ms TTL=58
Reply from 8.8.8.8: bytes=32 time=8ms TTL=58
Reply from 8.8.8.8: bytes=32 time=76ms TTL=58
Reply from 8.8.8.8: bytes=32 time=173ms TTL=58
Reply from 8.8.8.8: bytes=32 time=204ms TTL=58
Reply from 8.8.8.8: bytes=32 time=224ms TTL=58
Reply from 8.8.8.8: bytes=32 time=250ms TTL=58
Reply from 8.8.8.8: bytes=32 time=295ms TTL=58
Reply from 8.8.8.8: bytes=32 time=270ms TTL=58
Reply from 8.8.8.8: bytes=32 time=308ms TTL=58
Reply from 8.8.8.8: bytes=32 time=322ms TTL=58
Reply from 8.8.8.8: bytes=32 time=318ms TTL=58
Reply from 8.8.8.8: bytes=32 time=312ms TTL=58
Reply from 8.8.8.8: bytes=32 time=283ms TTL=58
Reply from 8.8.8.8: bytes=32 time=323ms TTL=58
Reply from 8.8.8.8: bytes=32 time=304ms TTL=58
Reply from 8.8.8.8: bytes=32 time=306ms TTL=58
Reply from 8.8.8.8: bytes=32 time=116ms TTL=58
Reply from 8.8.8.8: bytes=32 time=8ms TTL=58
Reply from 8.8.8.8: bytes=32 time=7ms TTL=58
Reply from 8.8.8.8: bytes=32 time=7ms TTL=58
Reply from 8.8.8.8: bytes=32 time=8ms TTL=58



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