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Traffic from the source crosses the middle router to reach two destinations.
Check that both IPv4 destinations reply before applying a filter.
Create an extended IPv4 access list and apply it inbound on the source-facing interface.
One destination stops replying and the permitted destination still replies.
Check that traffic matched both the deny rule and the permit rule.
Remove the interface binding to restore access to both destinations.
Check that both IPv6 destinations are reachable before filtering them.
Create an IPv6 access list and apply it inbound on the same interface.
Repeat the two IPv6 probes to verify the deny and permit rules.
Inspect the IPv6 access list to confirm both rules matched.
Remove the IPv6 interface binding and verify that both destinations reply again.
Both access lists remain available for reuse.