UTM SG135 managing guests traffic accessing wifi

Question

I am having to revisit this question and seek further guidance please. 
 I have enabled QoS on the relevant guest subnet but I need help with traffic selection. 
 I have named the traffic "guests downloading" with the guest network as the source, the service any and the destination the WAN. 
 For the bandwidth pool I have selected the bandwidth (4000) and upper bandwidth of 4000 and enabled the Guest downloading traffic but I am stuck when I get to Download Throttling. I seem to have two entries enabled. Why is that? 
 Also please advise if I have it right so that each guests can get up to 4096kb/s or have I in error set the total pool as 4096? I have 40Mb/s available for the broadband connection. 
 Please could somebody look over this and correct me where I am wrong. 
 Budgie2

Raphael Alganes · Answer

Hello, 
 Thank you for your response. Could you confirm if I understand correctly what you're trying to achieve that you want a guest users to have a maximum of 4096kb / 4mb only? 
 If yes, could you try using Bandwidth pools? https://docs.sophos.com/nsg/sophos-utm/utm/9.717/help/en-us/Content/utm/utmAdminGuide/RoutingQoSBandwidthPools.htm 
 Then set 4096 for Bandwidth and upper bandwidth limit. This configuration would specify an amount of bandwidth that the UTM won't use for any other service. Then If the traffic that matches the traffic selector needs more bandwidth, it will get more bandwidth, unless you set an upper limit. That being, we are setting an upper bandwidth limit of 4096 as per your requirement. 
 Also, you may try to remove your Throttling configuration as the Bandwidth Pool configuration would suffice the requirement. 
 Hope this helps. 
 Regards.