For your Windows XP machines, I think unfortunately you will need to install an external software package to get DHCPv6 client functionality. You may have already done this, I don’t know. A quick google search yielded this site which seems to be up to date: http://internecine.eu/systems/windows_xp-ipv6.html (scroll to the DHCPv6 heading).

Anyway, for your setup, one thing I’ve found useful to see if the DHCPv6 server is even running is to use the DHCPv6 client in foreground / information mode with the verbose debug flag on:

# Need to be root
dhcp6c -Df -i xl0

-D puts dhcp6c into verbose debug mode, -f does not daemonize (foreground), and -i tells it just to request information rather than configure the interface(s).

xl0 is the interface my DHCPv6 server is listening on, for you it would be em0. I did this on the machine running the DHCPv6 server. If everything has worked, you should see 20 lines or so of output, and there should be some in there that look like:

client6_recv: receive reply from %xl0 on xl0

and

info_printf: nameserver[0]

Since I’m not familiar with Mac OS X or Windows XP and IPv6, assuming the above _does_ give you the correct output, I don’t know enough about them to give you any next steps. There are, however, people in #ipv6 on Freenode who are experts, and who are usually pretty willing to help people like yourself who have done research.

em0:\
:addr=”2001:7b8:330::”:prefixlen#64:raflags#192:

With IPv6 enabled on all my clients they do get IPv6 addresses assigned from the /64 prefix configured in rtadvd.conf but not the ones I configured in dhcp6.conf and my IPv6 DNS server also does not get assigned to them (at least not visible in /etc/resolv.conf on Leopard and also not showing when running ‘netsh interface ipv6 show dns’ on the M$ XP clients.

dhcp6s is bound on udp6 port 547 and rtadvd is running as well.
When I do some debugging using tcpdump on the em0 interface I never see any request coming in on udp6 port 547 which leads me to believe that either I have setup the raflags incorrectly (I also used your exact raflags but with same result).

Hope you can shed some light on this.

Thanks!

Thanks for pointing this out! It was indeed causing problems on my setup, and now I know why. I believe I’ve fixed the references in my post.

Anyway, I loved the article and I’m probably missing something, and would love the clarification.

Thanks!