[Bug 235927] FreeBSD does not reply to ICMP requests when assigned an ip in 240.0.0.0/8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235927

--- Comment #10 from Conrad Meyer <cem at freebsd.org> ---
(In reply to Dave Taht from comment #9)
> (In reply to Conrad Meyer from comment #2)
> >If they're non-canonical, we should *not* allow them to be assigned to interfaces.
> 
> -1

Help me understand the disagreement :-).  I guess I should clarify — in the
absence of one or more enabled sysctl(s) permitting use of reserved address
space, my conclusion is that we shouldn't allow reserved IP ranges to be
assigned/routed.  Especially when we do not support them in other parts of the
stack which will silently fail (ICMP, ipfw, forwarding; maybe others).

Maybe my suggestion is overstepping the intentions of the IPv4 RFC; it has been
a long time since I looked at it, and class E wasn't my focus at the time.

Any way, if you want to elaborate on that, I'd love to learn more.  Thank you.

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