Hi,

Our default of net.inet6.ip6.v6only was off in 4.X, and was changed to
on on 5.X to follow NetBSD's practice.  This behavior on 5.X breaks
RFC2553/3493, and the change was intentional from security
consideration.  But, NetBSD changed it off by default.
How do you think our default of on?

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The default value of ip6_v6only (sysctl net.inet6.ip6.v6only) has
been changed.  The new value brings us closer in line with current
RFC-defined behavior and practices.

Itojun still has significant concerns about the new default behavior.
His concerns have been well-documented in
ftp://ftp.itojun.org/pub/paper/draft-cmetz-v6ops-v4mapped-api-harmful-00.txt

Best Regards,
NetBSD OS PMC (core)

--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
[EMAIL PROTECTED]  [EMAIL PROTECTED]  [EMAIL PROTECTED],jp.}FreeBSD.org
http://www.imasy.org/~ume/

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