Routing Looks Good, But Traceroute Still Fails
To finish this set of scenarios, this last scenario focuses on one particular root cause: IPv6 access control lists (ACL).
You have already learned how ping and traceroute commands can imply that a routing problem may exist. When ping and traceroute show that the host can forward a packet at least as far as the default router but not all the way to the destination, the problem probably sits in one of these two categories:
A routing problem exists.
Routing works, but some filter, like an IPv6 ACL, is ...
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