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Similar as with #12513, when the NIB is compiled in 6LN mode (but not 6LR mode), the address-resolution state-machine (ARSM) functionality is disabled in favor of the more simpler address resolution proposed in RFC 6775. However, if a non-6LN interface is also compiled in (without making it a router or border router) it will never join the solicited-nodes multicast address of addresses added to it, resulting in address resolution to that interface to fail. If the interface is not a 6LN (which in case 6LN mode is disabled is always false), a warning is now printed, encouraging the user to activate the ARSM functionality if needed.