Well there are a bunch of modules that can access the net ( if thats what you are trying to block ) and this thread has some ways to find all modules installed.

Regarding Perl breaking - I cannot think of any core module that allows for access to the internet ( and so removal of that will break the system ); Since I am not a 100% sure, you should, like I said earlier, keep them in a different location just so you can put them back if your OS were to break - you can do that from the main system.

In reply to Re^3: un-installing perl core modules inside a freebsd jail by tmharish
in thread un-installing perl core modules inside a freebsd jail by gideondsouza

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