RE: [DNA] Comments on draft-shim-dna-proactive-00.txt

[Zhigao Chen <zgchen@psl.com.sg>]

Hi Bernard,

I agree that a host risks ending up with longer latency if it tries to
reuse an existing address than acquire a new one right away. That
happens when a hint or the collected associated configuration
information is unreliable. It also happens when reachability test or DAD
fail. Having said that, I think it is worth giving the reusing a shot
despite the potential downside.

Regards,
Zhigao
 
> 
> > That may mean a single pair of messages direct to that 
> router, but I'd 
> > guess that this is fairly fast if the configuration was correct (a 
> > likely case).
> 
> Exactly.  One thing to keep in mind is that a hint can both 
> be highly likely to be correct, and also not worth 
> considering, depending on the penalty paid for its being wrong.
> 
> As an example, NS/ND (or ARP) can only demonstrate 
> reachability, not unreachability.  Therefore a hint 
> indicating that the host has remained on the same subnet will 
> have a substantial downside (a timeout) if it is wrong.
>