Hajimu UMEMOTO <ume_at_mahoroba.org> wrote: > 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. OpenBSD's behavior is equivalent to v6only on, and OpenBSD doesn't even provide a knob. Note that the default choice has a major impact on 3rd party software (ports). If we ship with a default of v6only off, then people will not fix software to open two sockets. This in turn means that turning v6only on will break this software. I predict that a good many people will then consider the v6only option to be useless. I understand that itojun would like to see this aspect of RFC2553 amended. I don't know what the prospects of this happening are on the IETF level. -- Christian "naddy" Weisgerber naddy_at_mips.inka.deReceived on Tue Oct 28 2003 - 15:30:14 UTC
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