I opened Port Forwarding, and set Jazz2 to 192.168.1.3, which is my IPv4 address, and to ports 10052 and 10054.
It's still pinging though. The only difference is that when they're forwarded, the client CAN see my version and total guests.
Can I have some additional help?
P.S. I also get a line with name Teredo and port 55703. What does it mean?