On Sun, Sep 18, 2016 at 10:19:52AM -0500,
 Yang Yu <yang.yu.l...@gmail.com> wrote 
 a message of 9 lines which said:

> I got "Invalid target" error when I tried to create a measurement to
> see how far some RFC 1918 prefixes got propagated (carrier not
> properly filtering customer announcement). What is considered
> invalid for each measurement type?

Security/privacy reasons: without this rule, people could scan private
networks where a probe is hosted.

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