Currently we don't support any wildcarding or prefixes with
respect to literal IP addresses in java.net.SocketPermission.
This means that when running with a security manager, you need
to set a lot of very specific individual permissions to do simple
things like enumerate all of the local interfaces and addresses.

This is particularly a problem for IPv6, but also applies to IPv4.

It should be possible to have a permission like the following:

permission SocketPermission "[fe80::/16]" "connect,accept"

which would mean permission to talk to any host on the local
link, as opposed to having to list all of the full IPv6
addresses literally.