[Bug 212229] IP IDs generation behavior issue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212229

            Bug ID: 212229
           Summary: IP IDs generation behavior issue
           Product: Base System
           Version: 11.0-RC1
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jlduran at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

FreeBSD 11.0-RC1: The `net.inet.ip.random_id` sysctl does not appear to be
randomizing when set to `1`.

Tested on two bhyve virtual machines and using nmap.

FreeBSD 11.0-RC1:

    $ nmap -O -v -Pn freebsd-11.0-rc1.example.com
    ...
    IP ID Sequence Generation: All zeros
    ...

FreeBSD 10.3-RELEASE (works as expected):

    $ nmap -O -v -Pn freebsd-10.3-release.example.com
    ...
    IP ID Sequence Generation: Randomized
    ...

On 10.3-RELEASE, out of the box (`net.inet.ip.random_id=0`) the IP IDs
generation behavior was "Incremental", as stated in `inet(4)`.

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