Date: Tue, 8 Jan 2013 16:02:43 -0500 From: "J.R. Oldroyd" <fbsd@opal.com> To: Ulrich =?UTF-8?B?U3DDtnJsZWlu?= <uqs@freebsd.org> Cc: Gregory Shapiro <gshapiro@freebsd.org>, stable@freebsd.org Subject: /etc/rc.d/ip6addrctl Message-ID: <20130108160243.74a93ab8@shibato> In-Reply-To: <20130108184609.GJ35868@acme.spoerlein.net> References: <20130108151837.GF35868@acme.spoerlein.net> <20130108180920.GJ36633@rugsucker.smi.sendmail.com> <20130108184609.GJ35868@acme.spoerlein.net>
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On Tue, 8 Jan 2013 19:46:09 +0100 Ulrich Sp=C3=B6rlein <uqs@freebsd.org> wrote: > Turns out it was the missing setting of > ip6addrctl_policy=3D"ipv6_prefer" in rc.conf that also bit me in > strange and mysterious ways on another machine where I did the > upgrade. It's very unfortunate that this will runtime-break sendmail > and I honestly don't know why we make ipv4 the default in this day > and age. >=20 > Can some IPv6 guru chime in here? This is all thoroughly confusing. >=20 > Thanks! > Uli >=20 This bit me too, although with something other than sendmail. It's /etc/rc.d/ip6addrctl that sets the preference for IPv6 or IPv4. I think the logic is a bit confusing here, or at least isn't consistent with what the documentation for these settings (in rc.conf(5)) suggests. In the startup script, IPv6 is preferred if: either: ip6addrctl_policy is set to "ipv6_prefer" or: ip6addrctl_policy is set to "auto", you've not specified your own policy config file and ipv6_activate_all_interfaces is set to true In the documentation, it implies that using ipv6_activate_all_interfaces is probably not needed for most users: Note that it is not always necessary to set this variable to =E2=80=9CYES=E2=80=9D to use IPv6 functionality on FreeBSD. In most cases, just configuring ifconfig_=E2=9F=A8interface=E2=9F=A9_ipv6 variables works. Seems to me that the ip6addrctl script should also prefer IPv6 if any interface has IPv6 enabled using one of the ifconfig_(interface)_ipv6 variables. -jr
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