When does webrtc peerconnection ice state go to 'disconnected'?

[Faraz Khan]

Hi all,

Just curious - is it if it gets no STUN keep-alive for 5s? Sometimes we see our ice connection state go to 'disconnected'  when the network seems okay (another peer connection from the same host stays at connected). Just curious as to what might cause a possible 'fake' disconnect. We are on revision 7786.

[Kaiduan Xie]

Faraz,

Please see how connection write state changes in 

http://code.google.com/p/webrtc/source/browse/trunk/webrtc/p2p/base/port.cc#1098

It looks like when connection state changes from WRITEABLE to UNRELIABLE, the ice state also goes to disconnected.

http://code.google.com/p/webrtc/source/browse/trunk/webrtc/p2p/base/p2ptransportchannel.cc#1032

/Kaiduan

On Wed, Mar 11, 2015 at 1:01 AM, Faraz Khan <faraz...@gmail.com> wrote:

Hi all,

Just curious - is it if it gets no STUN keep-alive for 5s? Sometimes we see our ice connection state go to 'disconnected'  when the network seems okay (another peer connection from the same host stays at connected). Just curious as to what might cause a possible 'fake' disconnect. We are on revision 7786.

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[faraz khan]

Kaidun,

Thanks! So seems like its based on whether 5 ping replies got missed and its been > 5s since last stun ping. Thats very unlikely to happen (unless you actually got disconnected). Seems like something on our side causes RTT to spike > 5s, resulting in these stun pings timing out. 

Thanks Kaidun - this is extremely helpful! 

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Faraz Khan