What is NPA best practice when it comes to restricting access to home network ranges? Naturally we first thought of creating an RFC 1918 sinkhole app using port 10, however this would restrict access to internal apps as well. If we just carve out and allow our own internal ranges, while sink holing those ranges we don't use, we still allow users access to any home network ranges that are identified as internal. How are other people handling this?
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