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

[Olivier Crête]

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