No, it won't be enough. Your ASA with a 100 MBit/s interface will never see any congestion because the next device is the one that restricts the traffic to 5 MBit/s and that drops packets.
To make sure that the ASA sees the congestion (which is needed to give QoS the possibility to control the traffic) you have to configure shaping on the outgoing interface to about 5 MBit/s. But test it in a timeframe with not so much mission-critical traffic. I had strange results with shaping a many ASA-versions.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...