
<p>In lwIP, each IPv6 address has an associated zone index. This zone index may be set to "no zone" (IP6_NO_ZONE, 0) or an actual zone. We say that an address "has a zone" or "is zoned" when its zone index is <em>not</em> set to "no
zone." In lwIP, in principle, each address should be "properly zoned," which means that if the address has a zone if and only if has a scope. As such, it is a rule that an unscoped (e.g., global) address must never have a zone. Even though one could argue that there is always o