Are you sure you don't mean NAT'ing? Subnetting shouldn't cause problems... unless it's not configured right, but that's hardly the technology's problem....
Anyhow.... Someone's actually going to use IPv6? They were talking about that back when I was still in college (almost a decade ago now) and it's still never been widely adopted. Probably because the addresses are as confusing as hell.
"192.168.1.1" is one thing. But "2001:0db8:4545:3:200:f8ff:fe21:67cf" is going to take some getting used to.
Edit: Here's a fun article... The IPv6 mess.
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