This is known as a zone id or scope id. These can be sent in response to a previously received ndp router solicitation (rs) message. The document discusses ipv6 global unicast address (gua) assignment
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A gua can be manually configured on a router or windows host.
Stateful dhcpv6 is a method where devices automatically receive their addressing information including a gua, prefix length, and the addresses of dns servers from a stateful dhcpv6 server.
On studocu you find all the lecture notes, summaries and study guides you need to pass your exams with better grades. A message defined by the ipv6 neighbor discovery protocol (ndp), used by routers to announce their willingness to act as an ipv6 router on a link