i'm trying to get Teredo to function on my machine.

Most routers, it seems, refuse to forward packets from any host other than the one i specifically connected to first. [Teredo](http://en.wikipedia.org/wiki/Teredo_tunneling) requires [full Cone NAT](http://en.wikipedia.org/wiki/Network_address_translation) in order to function.

Does any router, hardware or software, allow full cone NAT? 

Is this an oversight by the designers of Teredo that nobody, in practice, can use it?

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i've tried

* m0n0wall
* pfsense
* D-Link
* Linksys
* SMC