Yes, you were faster than light... ;-) Thank you a lot. Just to be clear: since NAT behavior may vary according to time, traffic, and so on,... in order to implement an application NAT-independent, we need to model the NAT device: let f(t) be the NAT behavior "at time t", based on the local socket address of the client, and the destination socket address for outgoing packets. For these variables I wanna know: - the public address for the local socket; - if the mapping is Endpoint-Independent; - if the filtering is Endpoint-Indipendent. Thanks to these 3 informations, I know all it's needed to do NAT traversal (and I can choose among 2 techniques: Hole Punch and TURN). Your API "pj_stun_detect_nat_type()" does the first job: model the NAT device, at the time t when I start my application, for a local socket. The next step is doing UDP Hole Punch between 2 peers: - every client detects its NAT; - every client sends these info to an Introducer Server; - the Introducer Server replies these data among peers. When a peer receives the client data, the Hole Punch starts: every client tries to send a simple "Hello World" to the peer, via the local or the mapped address. At this moment, I'm not considering the case where clients are both behind a symmetric NAT, so this procedure would be succeful. And that's why I'm studying your libraries... So, if you have some idea or if you think I'm wrong, I'm listening...;-) Any suggestions will be very appreciate....(?_?') (I'm in trouble..) --- Lun 14/7/08, Benny Prijono <bennylp at pjsip.org> ha scritto: > Da: Benny Prijono <bennylp at pjsip.org> > Oggetto: Re: [pjsip] NAT traversal implementation: modify nat_detect.c? > A: "pjsip list" <pjsip at lists.pjsip.org> > Data: Luned? 14 luglio 2008, 19:20 > On Mon, Jul 14, 2008 at 5:42 PM, Enrico De Razza > <ederazza at yahoo.it> wrote: > > > Thanks Benny! > > > > Now I've a new question for you. > > I've modified the nat_detect.c in order to > retrieve in the client_main.c > > the mapped addresses and the local socket for which I > gained the detection. > > I've tested these data with Wireshark, and they > matches. > > Now I'd like to send from the same local socket > (used in the detection) a > > simple UDP datagram to a simple UDP server. > > And that's the problem: I bind to the same port, > but I get a new port, and > > so I can't receive the data back from the server, > because they arrives to > > the port saw by the server, but different from the > port where I'm waiting > > for... > > What about the use of the SO_REUSEADDR for the local > socket in > > nat_detect.c? The problem is that I don't know how > to perform the call to > > your API pj_sock_setoptions()... > > > > That's not how the NAT detection socket is supposed to > be used actually. The > intended purpose is just to display information to user, > and that's perhaps > the only reliable thing to do (people say that NAT behavior > can vary > according to port number, and it can even change the > behavior after some > time for the same socket). > > But if you want to get the STUN mapped address, use the > STUN socket > transport [1] instead. > > [1] > http://www.pjsip.org/pjnath/docs/html/group__PJNATH__STUN__SOCK.htm > > > > > > > > After that, I wish to initiate a ICE connectivity > check, for the same > > socket for which I done the detection. How can I relay > the information from > > one point to another? That is: how can I say to ICE > transport that I've > > detected (local IP_a:port_a)(mapped IP_A:port_A)? How > can I forward these > > info to the peer, in order to start the check? > > > > > With SIP+SDP? > > > I hope you will answer soon. > > > > Is this soon enough? ;-) > > I don't know what's your expectation regarding this > list's responsiveness, > but as with any open source projects, this has always been > served on best > effort basis. After all, it's free (you don't pay > "membership" fee to post > questions, do you? ;-) ). > > Cheers > Benny > > > > > > > > Bye. > > > > > > Posta, news, sport, oroscopo: tutto in una sola > pagina. > > Crea l'home page che piace a te! > > www.yahoo.it/latuapagina > > > > _______________________________________________ > > Visit our blog: http://blog.pjsip.org > > > > pjsip mailing list > > pjsip at lists.pjsip.org > > > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > >_______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org Posta, news, sport, oroscopo: tutto in una sola pagina. Crea l'home page che piace a te! www.yahoo.it/latuapagina
