[input_sh]

Torrents. As in you don't want your whole traffic to go through a VPN, but you may be in one of those places where a torrent client is a must.

[wkat4242]

Routing your whole traffic doesn't help. The IP on the other side isn't just used by you.

The problem is inbound connections. If both peers are behind NAT they can't connect.

[michaelmrose]

You don't need port forwarded to use bittorrent. Clients connected to the network exchange information with each other. Magnet links or torrent files provide the information needed to get in touch with peers to make the initial connection.

[gersg]

If neither side has their ports open there is no way to make the initial connection.