[Backport v3.7-branch] tests: net: Fix conn_mgr_monitor tests #86030
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Using L2 address of length 1 (invalid/unsupported one) confused IPv6 layer during LL address generation - since that length was not a valid one, the address was not initialized properly and a part of it was set semi-random. This could result for example in filling out the neighbor tables. Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no> (cherry picked from commit 3089a5d)
DAD creates an entry in the neighbor cache for the queried (own) address. In case the address is removed from the interface while DAD is still incomplete, we need to remove the corresponding cache entry (just like in case of DAD timeout) to avoid stale entries in the cache. Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no> (cherry picked from commit a09fd8e)
In rare occasions when sending DAD NS packet fails, we should still setup the DAD timer, unless we implement some kind of more advanced retry mechanism. If we don't do that, the IPv6 address added to the interface will never be usable in such cases. Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no> (cherry picked from commit 008a7ca)
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Backport 008a7ca~3..008a7ca from #85888.
Fixes #85816