Enable IPv6 Privacy Extensions by default

[Tijl Coosemans]

On Sun, 11 Jun 2017 22:13:14 +0000 "Bjoern A. Zeeb" <bzeeb-lists at lists.zabbadoz.net> wrote:
> On 11 Jun 2017, at 19:59, Tijl Coosemans wrote:
>> I recently got a new modem/router from my ISP that supports IPv6.  Added
>> ifconfig_em0_ipv6="inet6 accept_rtadv" and rtsold_enable="YES" to
>> /etc/rc.conf like the handbook says and now all my FreeBSD systems have
>> an IPv6 address. \o/
>>
>> I also added these lines to /etc/sysctl.conf to enable temporary
>> addresses:
>>
>> net.inet6.ip6.use_tempaddr=1
>> net.inet6.ip6.prefer_tempaddr=1
>>
>> Shouldn't these be enabled by default?  There was a proposal 9 years ago
>> that didn't get any objections but it seems it wasn't committed:
>> https://lists.freebsd.org/pipermail/freebsd-net/2008-June/018381.html
>>
>> If there are no objections, I'll make the change in a week or so.  
> 
> Object :)
> 
> Check the rc.conf ipv6_privacy option rather than setting the sysctl
> manually.

Ah, thanks.  I see that RFC 4941 also recommends it be disabled by
default.