I think it's best to say intermediate nodes SHOULD NOT retransmit of their own accord. They should do so only when they receive a retransmit from the NAS. Is this an issue we need to address? How do current implementations deal with retransmits?
Proxy retransmission is definitely a bad idea, since it violates the principle of "Conservation of Packts", and thus could lead to congestion problems. I don't have personal knowledge of proxy implementations that retransmit, but then again I wouldn't be surprised if such implementations existed.
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