RTCPeerConnection stuck at gathering state, IPV6 Only Network

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Ankur Deep Jaiswal

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Sep 17, 2021, 3:01:06 AMSep 17
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Hi,
What can cause RTCPeerConnection to be stuck at gathering state, without even collecting local candidates,
Have Tried all/relay options, but no candidates
This seems to impact any chromium based implementation, Google Chrome, Edge.

Firefox Had No Issues, was able to gather local and remote candidates.

This is an IPV6 only network and firefox was gathering anonymized local Candidates,

Chrome  93.0.4577.63, Windows 10, IPV6 Only Network
Firefox: 91

Help Appreciated in advance
Ankur Deep Jaiswal

Harald Alvestrand

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Sep 17, 2021, 6:04:29 AMSep 17
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Can you send us the interface configuration (I think it's "ip addr" on windows, but unsure)?
In particular, the IPv6 addresses in use?

There's a couple of outstanding bugs wrt candidate gathering on IPv6 networks, but it has been hard to get a repro; one known issue is that Chrome/WebRTC refuses to use MAC-based non-privacy-enhanced IPv6 addresses for privacy reasons (they are perfect tracking tokens).

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Ankur Deep Jaiswal

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Sep 21, 2021, 3:12:10 AMSep 21
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Hi,
do you mean ipconfig ?

Ankur Deep Jaiswal

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Sep 22, 2021, 5:13:28 AMSep 22
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Hi, This is what i was able to gather.

Windows 10.0.18363.1556
Connection-specific DNS Suffix . :
IPv6 Address .  .  .  .  .  .  .  . . . . . . : fd00:4408:2009:1::23aa
Link-local IPv6 Address .  .  .  . . . : fe80::81e3:6d0d:9cf5:9f9a%5
Default Gateway .  .  .  .  .  .  . . . . .: fd00:4408:2009:1::2301
                                                            fe80::5:73ff:fea0:17%5
Please do let me know, if more info in needed.
Thanks
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