If 6to4 can be improved (see 6rd here), why not improve Teredo / Miredo? As a happy Teredo / Miredo user, I have a few suggestions:First: Make Teredo an ISP service, by strongly binding it to the ISP: teredo server, teredo relay and addresses from the ISP. That way, ISPs have an incentive to deploy Teredo / Miredo infrastructures: help their own customers (instead of helping random people accross