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n2n supports the carriage of IPv6 packets within the n2n tunnel. N2n does not yet use IPv6 for transport between edges and supernodes.
To make IPv6 carriage work you need to manually add IPv6 addresses to the TAP interfaces at each end. There is currently no way to specify an IPv6 address on the edge command line.
eg. under linux:
on hostA:
[hostA] $ /sbin/ip -6 addr add fc00:abcd:1234::7/48 dev n2n0
on hostB:
[hostB] $ /sbin/ip -6 addr add fc00:abcd:1234::6/48 dev n2n0
You may find it useful to make use of tunctl from the uml-utilities package. Tunctl allow you to bring up a TAP interface and configure addressing prior to starting edge. It also allows edge to be restarted without the interface closing (which would normally affect routing tables).
Once the IPv6 addresses are configured and edge started, IPv6 neighbor discovery packets flow (get broadcast) and IPv6 entities self arrange. Test your IPv6 setup with ping6 - the IPv6 ping command.