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Re: Video chat, voice over IP, video conferencing, and the use of NAT.

On Sun, 06 Nov 2005 21:52:03 +0100, Herman Robak <herman@skolelinux.no> wrote:

On Sun, 06 Nov 2005 20:43:19 +0100, Petter Reinholdtsen <pere@hungry.com> wrote:

Wow.  So all users behind NAT addresses are unable to use p2p
networks?  Now strange, as NAT networks are quite common.  Does this
affect all P2P networks?

  I should think so.  The solution is either

1) Manually configured port forwarding (a hassle, requires access to the NAT)
2) Port forwarding automatically triggered by the clients, using
   Universal Plug and Play (uPnP).  This is considered a security hole.

 Actually, for UDP traffic there are more options, most of them dirty hacks.

One of them, STUN, even has an RFC <http://www.ietf.org/rfc/rfc3489.txt>

Herman Robak

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