Does AWS have native IPv6 yet?
It does, and if you created the right instance type (and created it recently)
it's automatic:
If so, please set on both relays:
ORPort [IPv6]:Port
And on the Exit:
IPv6Exit 1
ipconfig -6or
Ifconfig eth0
should tell you what the IPv6 address is: you'll want the publicly
routable one, which probably starts with "200".
We're working on automating IPv6 address detection for relays.