Jan Behrens <jbe-ml...@magnetkern.de> wrote in <20200313202833.cbbe8d1679ac0fd7a8078...@magnetkern.de>:
jb> Dear all, jb> jb> I'm using FreeBSD 12.1 with an ISP that supports IPv6. I have IPv6 jb> privacy extensions enabled (ipv6_privacy="YES" in /etc/rc.conf which jb> sets net.inet6.ip6.prefer_tempaddr=1). jb> jb> Given my router and ISP (who supports IPv6), my machine's FreeBSD jb> system assigns me 5 addresses through IPv6 autoconfiguration: jb> jb> link-local: fe80::<modified EUI-64>%<interface> jb> ULA: fd<prefix>:<modified EUI-64> jb> ULA privacy: fd<prefix>:<randomized> jb> Public: 2003:<prefix>:<modified EUI-64> jb> Public privacy: 2003:<prefix>:<randomized> jb> jb> When I setup a static IPv6 address in the ULA range, such as jb> (fd<prefix>::2) and enable the "prefer_source" option (see man jb> ifconfig), the "prefer_source" option is ignored. It seems that jb> net.inet6.ip6.prefer_tempaddr=1 takes precedence. jb> jb> Calling sysctl net.inet6.ip6.prefer_tempaddr=0 fixes my problem but jb> disables privacy extensions altogether (which I would like to keep jb> enabled). jb> jb> Is it intended that "net.inet6.ip6.prefer_tempaddr" takes precedence jb> over "prefer_source"? If yes, why? Yes, and the reason is that RFC 6724 specifies that behavior. Why do you want to use fd<prefix>::2 over fd<prefix>:<random> as the default source address? If prefer_source takes precedence, the tempaddr will nerver be used. -- Hiroki
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