It occurred to me that Pavel Cahyna wrote in gmane.os.netbsd.devel.network:
> # cat /etc/ipnat.conf                                               
> bimap ex0 85.145.84.197/32 -> 192.168.5.10/32 ipv6
>
> # /etc/rc.d/ipnat onestart
>
> # ifconfig lo0 inet 85.145.84.197 alias
>
> Now outgoing 6to4 should work.

Very tricky, my friend. Unfortunately, I won't be able to test it tonight,
but I think I owe you a pivo.

-- 
    Martijn van Buul - pino@dohd.org - http://www.stack.nl/~martijnb/
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 The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov