IPv6 as encapsulation allows IPv4 or IPv6 packets to be forwarded within an IPv6 ESP tunnel, also the IKE protocol can run over IPv6. Current support only includes tunnel type support:
static LAN-to-LAN tunnel
dynamic LAN-to-LAN tunnel
remote-access tunnel (For IKEv1, only v4 over v6 is supported)
For an ipsec-gw or ipsec-tunnel, only one local gateway address is supported, which could be either an IPv4 or IPv6 address. The SR OS also provides fragmentation and reassembly support for IPv6 ESP/IKE packets.