[libnice] why it takes so long (3 second) to get Local candidates?

Wed Nov 4 07:00:12 PST 2015

Olivier:

I enabled glib debugging and see there are lots of retransmission timeout as there is a network interface that is connected to intranet and can not access external STUN server:

(process:4472): libnice-stun-DEBUG: STUN transaction retransmitted (timeout 396ms).
(process:4472): libnice-stun-DEBUG: STUN transaction retransmitted (timeout 397ms).
(process:4472): libnice-stun-DEBUG: STUN transaction retransmitted (timeout 793ms).
(process:4472): libnice-stun-DEBUG: STUN transaction retransmitted (timeout 1589ms).
. . . . .

I am wondering if there is a way to shorten or limit the re transmission? 3 second can be too long for voip phone communication setup as the remote client may close the session if it does not receive response soon enough.

Tom

> From: olivier.crete at collabora.com
> To: chentom60 at hotmail.com; felixschlitter at gmail.com; nice at lists.freedesktop.org
> Date: Fri, 30 Oct 2015 16:18:21 -0400
> Subject: Re: [libnice] why it takes so long (3 second) to get Local candidates?
> 
> Hi,
> 
> There is a signal for new candidates also that will give you the
> candidates as they are discovered.
> 
> Olivier
> 
> On Thu, 2015-10-15 at 11:23 -0700, Tom Chen wrote:
> > Olivier,
> > 
> > The delay is in waiting for candidates gathering done signal not in
> > waiting for component state changed. If i don't wait for the
> > candidates gathering done signal, then the
> > nice_agent_get_local_candidates( ) will always return Null, thus no
> > candidate.
> > 
> > Tom
> > 
> > > From: olivier.crete at collabora.com
> > > To: felixschlitter at gmail.com; nice at lists.freedesktop.org
> > > Date: Thu, 15 Oct 2015 12:01:43 +0100
> > > Subject: Re: [libnice] why it takes so long (3 second) to get Local
> > candidates?
> > > 
> > > Hello,
> > > 
> > > libnice will do a STUN query from every local interface, in case
> > you
> > > have a multi-homed device, so if some of them are not Internet
> > > connected, then it waits for all of them to timeout. You can just
> > > ignore the state change and start sending candidates earlier if the
> > > delay is unacceptable for your application.
> > > 
> > > Olivier
> > > 
> > > On Thu, 2015-10-15 at 18:25 +1300, Felix Schlitter wrote:
> > > > I found that it can take a long time if I leave libnice to figure
> > out
> > > > my local interfaces. If I tell which local address I want to use,
> > > > it's a lot faster. But that may have been because it tried to use
> > a
> > > > local interface that had no internet connection. Maybe see if
> > > > `nice_agent_add_local_address` does anything for you.
> > > > 
> > > > On Thu, Oct 15, 2015 at 6:01 PM, tom chen <chentom60 at hotmail.com>
> > > > wrote:
> > > > > Hello,
> > > > > 
> > > > > I am using an external public STUN server,
> > > > > stun.l.google.com(74.125.194.127), port: 19302, to try
> > > > > /examples/simple-example.c.
> > > > > 
> > > > > simple-example can get its public IP as expected from this STUN
> > > > > server, so the public STUN server really works. However, I
> > notice
> > > > > that, somehow, it takes around 3 second to get local candidate
> > > > > list. Any idea why so long? Then I installed a local STUN
> > server in
> > > > > our intranet, still has same delay. I am wondering if there is
> > > > > anything waiting for some events during the gathering but
> > always
> > > > > timeout?
> > > > > 
> > > > > Tom
> > > > > 
> > > > > tao at ubuntu:~/workspace/libnice-0.1.13/examples$ ./simple-
> > example 1
> > > > > 74.125.194.127 19302
> > > > > Copy this line to remote client:
> > > > > 
> > > > > vPRk owHFru8Z6Dx8hj9TKel7Zl
> > > > > 1,2013266431,fe80::20c:29ff:fe34:d0c8,42411,host
> > > > > 2,1019216383,fe80::20c:29ff:fe34:d0c8,0,host
> > > > > 3,1015022079,fe80::20c:29ff:fe34:d0c8,50240,host
> > > > > 4,2013266431,fe80::20c:29ff:fe34:d0be,51731,host
> > > > > 5,1019216383,fe80::20c:29ff:fe34:d0be,0,host
> > > > > 6,1015022079,fe80::20c:29ff:fe34:d0be,43916,host
> > > > > 7,2013266431,fe80::20c:29ff:fe34:d0b4,35004,host
> > > > > 8,1019216383,fe80::20c:29ff:fe34:d0b4,0,host
> > > > > 9,1015022079,fe80::20c:29ff:fe34:d0b4,51142,host
> > > > > 10,2013266431,192.168.0.60,33635,host
> > > > > 11,1019216383,192.168.0.60,0,host
> > > > > 12,1015022079,192.168.0.60,51301,host
> > > > > 13,2013266431,172.16.1.129,41734,host
> > > > > 14,1019216383,172.16.1.129,0,host
> > > > > 15,1015022079,172.16.1.129,46629,host
> > > > > 16,2013266431,10.113.54.60,41481,host
> > > > > 17,1019216383,10.113.54.60,0,host
> > > > > 18,1015022079,10.113.54.60,33328,host
> > > > > 19,1677722111,204.96.168.3,41481,srflx ç Public IP
> > > > > candidates
> > > > > 20,847249919,204.96.168.3,0,srflx
> > > > > 21,843055615,204.96.168.3,33328,srflx
> > > > > 
> > > > > Enter remote data (single line, no wrapping):
> > > > > > ^C
> > > > > 
> > > > > 
> > > > > 
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> > > -- 
> > > Olivier Crête
> > > olivier.crete at collabora.com
> > > 
> > > 
> > > _______________________________________________
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> -- 
> Olivier Crête
> olivier.crete at collabora.com
> 
> 
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