How does seeding in uTorrent work if I don't forward any ports?

internet port router bittorrent

I didn't forward any ports on my router yet I can still seed in uTorrent. I'm curious as to how this works, because maybe this can give me insight into how I can host Battle.net games without port forwarding.


Solution 1:

quite simply, it connects out to other boxes, but other boxes can't connect to it.

Solution 2:

It is possible your router supports UPnP (Universal Plug and Play). If you have UPnP port mapping configured in uTorrent (check Options -> Preferences -> Connections), then you don't need to forward ports as it is configured automatically.

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