Rtadvd changes default IPv6 router (and breaks things)

Hello,
I have been testing IPv6 on my home network and I have decided to let my iMac act as a gateway, as it's the only machine that stays on most of the day. Everything works fine with the he.net tunnel, but a few seconds after I start rtadvd, the default v6 gateway is automatically set to the link-local (fe80::/16) address of the en0 interface, breaking v6 routing for my whole network. Manually deleting such route and readding the correct one (2001::/16) on the tunnel interface gif0 fixes it.
The problem is that I'm ultimately planning on having a shell script do all of this on boot, and having the script wait a given number of seconds before deleting and readding the route doesn't seem very elegant, not to mention that I don't really know how much time passes before the default route is changed.
This is what my gif0 and en0 interfaces look like:
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
tunnel inet 192.168.0.6 --> 216.66.80.30
inet6 fe80::217:f2ff:fed9:eb5e%gif0 prefixlen 64 scopeid 0x2
inet6 2001:470:1f0b:1393::2 --> 2001:470:1f0a:1393::1 prefixlen 128
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 00:17:f2:d9:eb:5e
inet6 fe80::217:f2ff:fed9:eb5e%en0 prefixlen 64 scopeid 0x4
inet 192.168.0.6 netmask 0xffffff00 broadcast 192.168.0.255
media: autoselect (100baseTX <full-duplex,flow-control>)
status: active
This is the default gateway that I manually set (and works):
Internet6:
Destination Gateway Flags Netif Expire
default 2001:470:1f0a:1393::1 UGSc gif0
And this is what it gets reset to (and stops working):
Internet6:
Destination Gateway Flags Netif Expire
default fe80::217:f2ff:fed9:eb5e%en0 UGc en0
This happens a short while after starting rtadvd, but I can't find anything in the manual pages that refers to the default route. I have used the very same configuration on FreeBSD (by replacing en0 with the correct interface name) and it worked flawlessly, so I'm not sure what the problem is. I suspect that I should add something to rtadvd.conf, because right now I only have a reference to en0 and that may be why the route is redirected there, but I'm not sure how to do that.
Here is my current rtadvd.conf:
en0:\
:addrs#1:addr="2001:470:1f0b:1393::":prefixlen#64:tc=ether:
Any hints will be greatly appreciated.
Thank you

krbonne:
Congratulations! I am glad you were able to resolve your issue. I'm not much of a hand at networking, hence my referring you to the other Forum.
Sorry, no Dutch ancestors. Just a Bible name my father chose for me. Incidentally, many linguistic traditions seem to favor the name, Ukranians, Hispanic, Philipinos and now Dutch, and I'm others as well.
Please do not hesistate to return to Discussions should you have further questions, or just to browse.
[edited by host - see Terms of Use, section 4.2.2 ]
Good luck.
cornelius

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