As I said in my post before that, it actually gets (re)set each time the router starts, by rdnssd. So it won't stick across reboots.
Ah, okay, reinitialized for each reboot, tricky. I'm sorry, I missed that in your post.
So do you know when rdnssd runs? I'm wondering if there's an user script that runs after it initializes that variable that these commands could be put in? Or does it run after all the startup user scripts have run, and we have to run these commands manually after rebooting until Asus provides a permanent fix? I don't have the sources to look at myself, obviously *smile*.
Sorry about all the questions.