RE: Sending ICMP error upon receiving an NA without SLLAO in 2461bis

 > > The basic issue left is whether we should allow a node to 
 > send an ICMP error
 > > due to the reception of an NA without the SLLAO. The 
 > reason for sending the 
 > > ICMP error is to inform upper layers that the communication has
 > > failed.
 > 
 > It took me a while to figure out what you are proposing. To 
 > summarize:
 > in the case where where a node receives an NA without an 
 > SLLAO, but it
 > is expecting an SLLAO (so it can complete the Neighbor Cache Entry),
 > such a received NA is "an error". In the case where a regular data
 > packet is queued pending completion of the NCE, you'd like to be able
 > to send back an ICMP error indicating "dest unreachable". Right?

=> Yes. 

 > 
 > This seems like a fairly minor optimization and one that deals with a
 > a potential "implementation error" (since I understand this situation
 > would normally only arise of the sender of the NA 
 > incorrectly left off
 > the SLLAO).  If this is the case, IMO, it's not worth modifying the
 > spec to allow this. Indeed, I'd have to think a bit to 
 > convince myself
 > that it couldn't lead to potential cases where an ICMP error would be
 > (incorrectly) sent when simply ignoring the faulty NA is actually the
 > more correct response (i.e., if proxies are present and more than one
 > NA is generated).
 > 
 > Is this a situation that has come up in actual testing/usage?

=> Christian Vogt raised this issue so perhaps he (or someone else) 
can answer this question. Personally, I've never encountered this case.

Hesham

 > 
 > Thomas
 > 

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