Connection forwarding is designed to handle asymmetric routing issues, as described here. All the ProxySGs that are in the critical network paths will form a cluster, so that every ProxySG knows the state of every other ProxySG in the same connection forwarding cluster. This feature is typically used in conjunction with ADN, but its application is not limited to WAN optimization deployments. Currently, the connection forwarding tunnel is IPv4 only, but it is capable of handling both IPv4 and IPv6 traffic.
6. The blue line illustrated in the following network diagram indicates how the packets are routed through the network. The packets that get forwarded between the ProxySGs are IPv6, although the tunnel indicated in this diagram is IPv4 only.