dhcpcd-discuss

On 25/08/17 16:10, Roy Marples wrote:
> > Add support for Privacy Extensions "temporary addresses" (RFC 4941
> > <https://tools.ietf.org/html/rfc4941> [1], obsoleted RFC 3041)
> > Preferrable for outgoing connections. In contrast to stable private
> > addresses (RFC 7217 <https://tools.ietf.org/html/rfc7217> [2]) for
> > incoming connections.
> > This should allow to get rid of /etc/interfaces completely, no more
> > "iface eth0 inet6 auto" with "privext 2" needed for privacy extensions
> > and no more hardware-address based addresses.
> > I assume this can be heavily discussed, as sysctl
> > <https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt> [3]
> > plays another rule in this topic
> > (/proc/sys/net/ipv6/conf/<interface>/use_tempaddr).
> >
> > Or is there another way to *only* have stable private and temporary
> > addresses assigned via SLAAC? No hardware-based addresses anymore.
> >
> > Example:
> > ## Default to additional temporary addresses for GUA
> > slaac temporary 2000::/3
> > ## ULA is handled by dhcp, no SLAAC
> >
> > interface eth0
> >    ## Temporary addresses for GUA
> >    slaac temporary 2000::/3
> >    ## Stable private addresses for services on GUA, preferred as the very
> > last for outgoing connections (that's what the temporary address is for)
> >    slaac stableprivate 2000::/3 PLFT=0 inform6
> >    ## ULA is handled by dhcp, no SLAAC
> >
> > [1] https://tools.ietf.org/html/rfc4941
> > [2] https://tools.ietf.org/html/rfc7217
> > [3] https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt
> > [4] Linux: ipv6_create_tempaddr()
>
> Temporary addresses should already work.
> But I've not tested this in a long time, so could be broken.
> I'll look into this tonight.

This was broken in dhcpcd-7!
I've pushed some patches to fix this, here is sample output with 
use_tempaddr=2

wlp6s0: soliciting an IPv6 router
wlp6s0: sending Router Solicitation
wlp6s0: Router Advertisement from fe80::1
wlp6s0: adding address fd73:7808:1015:0:34a8:16c7:ed4c:7542/64
wlp6s0: pltime 120 seconds, vltime 180 seconds
wlp6s0: adding temporary address fd73:7808:1015:0:5494:bab6:8a56:f7e0/64
wlp6s0: pltime 120 seconds, vltime 180 seconds
wlp6s0: adding route to fd73:7808:1015::/64
wlp6s0: adding default route via fe80::1
wlp6s0: waiting for Router Advertisement DAD to complete

Looks broken in dhcpcd-6 branch as well, but I've not tested nor fixed it.

Maybe you could try a the latest master in git to verify?

Roy