> On Jun 14, 2019, at 12:03 PM, Nils Ohlmeier <[email protected]> wrote:
> 
> Hello,
> 
>> On 14Jun, 2019, at 02:03, shazzzzzzzz <[email protected]> wrote:
>> 
>> Hi all,
>> 
>> I am trying out ICE restart scenario on Firefox and here is the description
>> 
>> - User A calls User B(both users are on same machine)
>> - Machine switches to new wlan(say wlan0 to wlan1)
>> - ICE connection state transitions to 'disconnected' for both users
>> - User A triggers renegotiation with ICE restart. Only TCP ICE candidates 
>> are gathered and call fails eventually
>> 
>> If the ICE restart is triggered without network interface switch, then 
>> Firefox gathers UDP ICE candidates as well and the call works fine.
>> 
>> The issue can be easily reproduced with WebRTC sample - 
>> https://webrtc.github.io/samples/src/content/peerconnection/restart-ice/
>> 
>> Tested on 
>> - Firefox 67.0.1 (64-bit) on Open Suse Leap 42.3 - Fails
>> - Firefox 67.0.2 (64-bit) on Windows 10 - Fails
>> - Chrome 74.0.3729.169 (64-bit) - Works
>> 
>> Can anyone confirm if this is issue from Firefox or if there is something 
>> wrong with my scenario!
> 
> Yes this is a known problem. Firefox currently doesn’t take new interfaces 
> into account. Neither automatically nor through ICE restarts.
> We have an open bug for it somewhere in bugzilla. I’m not sure when we are 
> going to fix it.
> 
> Best
>  Nils Ohlmeier

This is the open bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1548318

-Michael.

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