ankohuu commented on PR #18843:
URL: https://github.com/apache/nuttx/pull/18843#issuecomment-4372295474

   > Yes, unfortunately the RFC is ambiguous, it only said that I need to 
discard a packet with optlen 0. Fortunately my solution already fixes it 
because I do a "goto icmpv6_drop_packet" that will exit the entire loop.
   
   Before drop,  `neighbor_add(dev, ipv6->srcipaddr, sllopt->srclladdr);` the 
neighbor is added, but we don't need this effect.


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