RFC 4291:IP Version 6 Addressing Architecture
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End-point


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... token is not available (e.g., serial links, tunnel end-points) or where global tokens are undesirable (e.g., temporary tokens ...
... links and tunnel end-points, for example. The alternative would have been for these to be of the form 0200:0:0:1, 0200:0:0:2, etc., instead of the much simpler 0:0:0:1, 0:0:0:2, etc. ...



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