They're doing NAT for IPv4. The IPv6 network space listed in the slide is publicly routable and almost certainly untranslated. It's possible it's firewalled though.
Re:By installing NAT, MIT stifles innovation
by kevin_b_er on Monday June 26, 2017 @01:16PM
(#14638498)
> Then why are they doing NAT?
Because they sold their IPv4 addresses.
Then why are they doing NAT?
Edit: Although moving to NAT might push innovation too, or at least some clever hacks. Speaking of that, if you want use a relay to do NAT traversal then is TCP over ARQ (on UDP) as bad as TCP over TCP?