> No. The terminal (phone) doesn't need to act as a router to allow
> for multiple devices behind it to connect to the cellular interface.
> You could eventually have multiple serial connections to the terminal
> each having its own corresponding air interface connection. So it can
> act as a host (if you're running the IP stack + app on it) or as
> an L2 device (modem) for e.g. laptops behind it. That doesn't mean
> that there's no advantages in making it a router but it's not
> mandatory. 

The point, I think, is that the network that is seen by the devices
atached to the terminal must support all features of an IPv6 network
so that any IPv6 hosts can function when their connectivity is 
provided through such a terminal.  (subject to the normal bandwidth,
delay, packet loss etc. constraints)
 
Keith
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