I am not sure if there really is much difference in the end result.
Traffic might be Denied by the firewall configuration and it will be therefore Dropped. Traffic might be Denied due the interface ACLs or perhaps because there was a packet arriving on ASA that was supposedly part of an existing connection for which ASA does not have information in its connection table (end result is till Drop). Traffic might be Dropped because of the previously mentioned Deny caused by ACL. It might also be Dropped because of missconfigured NAT for example
Is some specific situation unclear related to these or why are you asking?
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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...