return both ipv4 and ipv6 address about stun

[ernado]

Hi, seems like the problem is in

c, err := stun.Dial("udp", addr)

If you change it to "udp4", server and client will talk using IPv4.

c, err := stun.Dial("udp4", addr)

Please try it, let's see if it works.

[leslie-wang]

It works. Thanks a lot.

It may benefit other people as well if you can add the description in README.

[leslie-wang]

Interesting. It can display ipv4 address, but seems like hole is not punch, and I can not connect the port from another server, which are at another home.

[ernado]

It depends on your NAT type.
If it is symmetric, the outgoing ports for two destination addresses will be different.