> My personal taste is that we rename the field "Reserved -- must be
> zero" so that people quit coming up with proposals just because, as
> one person at Salt Lake City put it, "it is embarrassing that we have a
> flow label field but nothing uses it so we should come up with a use"

if we do this, please say that:

hosts sending packets must fill the field with zero 
receiving hosts must ignore the field
forwarding engines must leave the field unchanged

else, it will never be possible to use those bits in a standard because
somebody will have already used them.
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