This is an excellent question. It is one that has been asked of me by my clients and I heard it asked in the MARS class I attended. The answer I was given:
In order to keep your database from becoming corrupted, rules you create cannot be deleted. They can only be deactivated.
Think about the fact you are profiling a network by using a MARS box. If you can later go in and delete entries in this profile the information is no longer completely valid. Every subsequent deletion further denigrates the profile that has been created. The creators of the MARS box realized this and prohibited anybody from altering the data. They did this so your efforts to mitigate a problem would be as accurate as possible.
If you create a lot of rules and the number of false positves in your database is excessive, all you can do is wipe the box clean and start over. Hopefully you have created a seed file for your devices so you don't have to re-enter them one at a time.
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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...