This change was made to address DoS concerns raised with having
the default behavior to respond to queries to the All-Nodes address.
Some people have argued that allowing nodes to respond in this
case simplifies an attacker's ability to map out a victim network.
...
Do others have concerns with the document as it is?
Yes. I completely agree with David on this. A NIQ to the link-
local all-hosts or all-routers group is a very useful feature
(maybe even the most useful for ICMP NIQ), and I don't think it's
good to forbid that.
I agree as well. This is one of the main uses for NIQ.
Bob
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