[BitTorrent] UPnP, NATs, and P2P

Yejun Yang yejunx at gmail.com
Tue Feb 15 16:06:02 EST 2005

Even without UPnP, penetrating NAT is still possible.
Currently MS Torendo IPv6 server protocal can let 2 peers both behind
NAT to communicate with each other directly without server relay.

On Mon, 14 Feb 2005 05:24:08 -0500, Bill Cox <bill at viasic.com> wrote:
> >From what I can tell, enabling UPnP on NAT enabled gateway is not
> currently a good idea.  There are too many computers with spy-ware and
> worse, and allowing those applications to open ports through your fire-
> wall is risky.
> The problem this causes is that P2P enabled applications like BitTorrent
> aren't able to contact peers behind NATs unless the users are computer-
> savvy enough to forward a BitTorrent port.
> Is this a long-term problem, or is there some solution out there?  IPv6
> wont do it: we don't use NATs just to save IP address space, we use NATs
> for security.
> Bill
> Yahoo! Groups Links

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