We were duplicating setting flags for the message and a combination of NLM_F_APPEND and NLM_F_CREATE which does not make sense. We should have been using NLM_F_REPLACE and NLM_F_CREATE since the kernel can dynamically create neighbors prior to us adding an entry. Otherwise, we can end up with cases where the message will time out after ~25s even though the neighbor still gets added. This delays the rest of the setup of the interface even though the error is ultimately ignored. (cherry picked from commit 192a9d95ea3e058afd824d38a9cea16ad0a84a57)
System and Service Manager
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