[Ekiga-list] NAT problems debugging

[Damien Sandras]

Le lundi 14 mai 2007 à 13:46 +0200, Jan Kasprzak a écrit :
> Damien Sandras wrote:
> : > - move 500 at ekiga.net test number to a different IP address than ekiga.net.
> : > 	Rationale: for some broken NATs, the call to 500 at ekiga.net works
> : > 	exactly because it communicates with the same IP address over
> : > 	both SIP and RTP. But calls to any other host fail (and because
> : > 	in my case the two ends were 200km apart, I have found about
> : > 	the problem only after returning home with no way to debug the
> : > 	remote end for next three weeks or so). It would be nice if 
> : > 	the call to 500 at ekiga.net can fail as well instead of giving
> : > 	a false positive report. The problem would then be easier to detect.
> : 
> : I do not understand why 500 at ekiga.net would work, and not with another
> : user. In case you are discussing with another user, the signaling is
> : going through Ekiga.net and the RTP stream directly through both
> : parties, but it should not change anything.
> 
> 	I don't know why, but it was that way. I repeatedly (in
> a time span of two days) called 500 at ekiga.net from behind the NAT,
> and it always worked. When I returned home, the remote end from behind
> the NAT tried to call me, and it did not work (I could hear them but they
> could not hear me). I don't even know what kind of NAT gateway their ISP
> uses, but looking at the reverse DNS it seems that they probably use a pool
> of NAT servers or a pool of public IP addresses. Maybe the traffic
> for a different IP addr goes through a different part of the NAT cluster?

Perhaps.

> : > 	Maybe ekiga can look at the port number of the incoming
> : > 	RTP traffic, and if this does not match the expected one,
> : > 	display a warning dialog saying that the remote side would probably
> : > 	not be able to hear us. Or even start sending further outgoing
> : > 	RTP data to this port instead.
> : 
> : Yes, that one is very correct. That feature was present in GnomeMeeting.
> : 
> : Could you please post a bug report about it on bugzilla.gnome.org ?
> 
> 	Done, http://bugzilla.gnome.org/show_bug.cgi?id=438297

Thanks !
-- 
 _     Damien Sandras
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