Date: Mon, 31 Mar 2025 15:39:30 -0400 From: Chris Ross <cross+freebsd@distal.com> To: freebsd-net@freebsd.org Subject: RFC4941 IPv6 privacy knobs and how to set them Message-ID: <EB360A00-2CFB-439F-918E-1C7450BB9BB6@distal.com>
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Hello all. Looking at some changes I made to configure my new gw router
last year but failed to document and check in, I find in my sysctl.conf:
+ # Use and prefer the RFC 4941 temporary addresses
+ net.inet6.ip6.use_tempaddr: 2
+ net.inet6.ip6.prefer_tempaddr: 2
Looking across the interwebs, I see information about setting these to 1,
and on using `ipv6_privacy` in /etc/rc.conf (which set them to 1), which
I did not do.
Is there documentation about what these variables mean, and if “2” is
a useful value different than “1”? If so, how are they different?
Thanks.
- Chris
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