You can add these access entries that define the bittorent port range. As shown below,
access-list Inside_IN deny tcp any any range 6881 6887
access-list Inside_IN deny udp any any range 6881 6887
access-group Inside-IN in interface inside
Note: The above configuration assumes that you already have an inside ACL created. If you don't, create one and make sure that other necessary services are added such as http, https, dns. Otherwise, users will not be able to access the internet entirely.
Another better method is to use a 3rd party URL/Web filtering software that is supported by ASA. This software has an already defined category for P2P applications such as BT, so you can block it by category rather than by ports. Examples of supported softwares, WebSense and Smart Filter.
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
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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...