Date: Wed, 02 Apr 2025 01:47:19 +0100 From: Jamie Landeg-Jones <jamie@catflap.org> To: freebsd-net@FreeBSD.org, cross+freebsd@distal.com Subject: Re: RFC4941 IPv6 privacy knobs and how to set them Message-ID: <202504020047.5320lJaL093323@donotpassgo.dyslexicfish.net> In-Reply-To: <EB360A00-2CFB-439F-918E-1C7450BB9BB6@distal.com> References: <EB360A00-2CFB-439F-918E-1C7450BB9BB6@distal.com>
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Chris Ross <cross+freebsd@distal.com> wrote: > Is there documentation about what these variables mean, and if “2” is > a useful value different than “1”? If so, how are they different? Hi, Chris. From: /usr/share/doc/IPv6/IMPLEMENTATION : | As documented in the source address selection document, temporary | addresses for privacy extension are less preferred to public addresses | by default. However, for administrators who are particularly aware of | the privacy, there is a system-wide sysctl(3) variable | "net.inet6.ip6.prefer_tempaddr". When the variable is set to | non-zero, the kernel will rather prefer temporary addresses. The | default value of this variable is 0. Additionally, the files in /usr/src/sys/netinet6/ treat the value as a boolean, so it appears that in this case, 2 isn't twice as private as 1 :-) Cheers, Jamie
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