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11e9b7c08f
Consider the following: A node tries to forward a packet to another host for which it does not know the route yet. It assumes it to be on-link and starts a neighbor solicitation, putting the node address in the destinatio cache. Later the route is known (via a second hop) but the host is still in the NIB. The result is that gnrc_ipv6_nib_get_next_hop_l2addr() ends up in the "nib: %s is in NC or on-link, start address resolution" case and does not attempt to resolve the route. This results in the host remaining unreachable even though now a route is present.