Dino,
Why not take the advice of RFC 4443? It says that a router SHOULD send an ICMP
message.
Ron
> 4) Generally, a section specifying ITR behavior in regard to packets
> is missing.
> i) For instance, if an ITR receives a Negative Map Reply indicated
> "drop", should the ITR send an ICMP Destination Unreachable with
> Host Unreachable?
We did not want to specify this because in practice when this is done
either the ICMP messages are either rate-limited or filtered so ICMP
is not a reliable mechanism.
Experimentation will tell us more on what to do.
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