That will do it... I'll meditate on a correction to the man page,
which I think is wrong; it shows
ifconfig gifN A netmask 0xffffffff tunnel A D up
i.e., reusing A.
One can do many things with gif, and that might be legit. I suggest
adding an example for 6bone-like usage and perhaps adding a caution that
gif is powerful enough to do nonsensical things.
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