I play with Packet Tracer 6.2 using IPv4 and IPv6 addresses, trying to ping routers using the envelope icon.
When both routers are IPv4 or IPv6, clicking envelope correctly chooses between ICMP and ICMPv6 packets. But I can't seem to use it when source server uses IPv6 and destination both IPv4 and IPv6. Envelope chooses IPv4 and fails.
I failed to use complex PDU - the source ip is 0.0.0.0.
When I try to ping from console, ping using IPv6 has 100% success rate. I can live with that, but is there some more comfortable way like Mr. Envelope?