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Subject: [Bug 198092] getaddrinfo(3) fails with "Invalid value for ai_flags"
 (error code 3) if hint.ai_flags contains AI_V4MAPPED
Date: Fri, 20 Nov 2015 18:43:54 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198092

--- Comment #5 from Mark Felder <feld@FreeBSD.org> ---
(In reply to John Baldwin from comment #4)

I believe the decision to be non-conforming was intentional due to security
issues that RFC presents. The internet seems torn about whether or not V4
mapped V6 addresses should have ever been created because it allows some nasty
backdoors if your firewalls don't cover this scenario.

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