Cisco ASA 5508-x (Limit/Block Downloads but not affecting the internet/intranet speed)

Hello Everyone,

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I have an internet speed of 20Mbps, as my topic states, I would just like to know how to achieve this. I tried creating a Service Policy Rule, but what happened was, it made the segment/vlan's download and upload speed to 5Mb.

This config is easier on FortiGate 100D, as you can just input a limit of like 10Mb, and users will be prompted with a "You can't download this file as it is larger than the size provided by your IT Administrator",

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I am very new to Cisco ASA. Any help would be much appreciated.

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Thank you,