12/25/2022 0 Comments Safari technology preview toggle![]() ![]() Click the “Gather candidates” button at the bottom. ![]() This is done via UDP sockets and part of the core WebRTC functionality for NAT traversal. This is a pretty simple test that uses WebRTC to ask a STUN server for the device’s public IP address. Turn off Private Relay in your iOS 15 iCloud settings.If there is an expectation of IP address privacy with private relay, how does Apple explain the following simple experiment: Private Relay OFF These MDNS entries can be resolved on the local network only, still allowing for important use-cases like file transfer.īy the way – it was Apple folks who came up with the idea and it is great (also hey Googlers, mind updating the status of your Android implementation of that feature?).įippo did a whole talk on that one if you want more information: eb93e835-73d6-4a13-b6f6-2be4f3dee256.local are used instead of your IP addresses. When enabled, randomly generated addresses that use a UUID – i.e. To help resolve this issue, Multicast DNS (MDNS) candidates were introduced. This was not the desired intent of these API’s. The only reason for this magnitude of difference is tracking, and you can often see this yourself by looking for sites you don’t recognize in webrtc-internals / about:webrtc. Why would an app do a setLocalDescription and not setRemoteDescription? Well if you wanted to track a user’s local IP addresses and used that for fingerprinting you wouldn’t need the setRemoteDescription. Looking at the stats, the local description is called more often than the remote description: Chrome stats: setLocalDescription To establish a WebRTC connection that actually sends something, the app needs to make both a setLocalDescription and setRemoteDescription call. How often does this happen? We can actually make an approximation using the Chrome Platform Status tracker. This topic comes up in WebRTC quite often and we’ve written about it often. ![]() If you are new to this, see Chad’s Kranky Geek video for a more detailed explanation:ĭoesn’t that expose your private IP address? Yes, it does and that is by design. When you make an RTCPeerConnection, you should specify the iceServers object as part of the configuration. ![]() WebRTC STUN returns your public IP address Your browser then gets this data and uses it as part of the negotiation process. Your browser pings the STUN server and it responds with the public IP it sees for you. One of the most common methods is a Session Traversal Using NATs or STUN server. ICE is a procedure for making sure this IP address information gets between you and the callee. That’s where Interactive Connectivity Establishment (ICE) comes in. Network Address Translation (NAT) and firewalls often prevent this direct communication. To establish a direct connection, the browsers need to know each other’s IP addresses. Peer-to-peer is used because a direct p2p connection is usually the fastest and low latency is critical for quick, interactive communications. Your camera, microphone, screen share, and data streams are sent directly from your web browser to another web browser. We’ll show this in action in a moment, but first, let’s review ICE and what it matters. We did some quick tests on the public iOS 15 release that was posted last week and discovered WebRTC’s Interactive Connectivity Establishment (ICE) process breaks Private Relay. The website provider doesn’t get your IP address, keeping you anonymous to them.Īt least that is how it is supposed to work. Apple is aware of your IP address, but not what site you are looking at. Apple provides a proxy service that is only aware of your IP address and they forward the request on to yet-to-be-identified third-party content providers that actually establish the connection. In a nutshell private relay is supposed to hide your IP address. For some background reading, refer to this interview or this excellent support article from Apple for technical information. ICloud Private Relay is one of the new features in iOS 15 available with iCloud+. This feature is currently broken with WebRTC. “iCloud Private Relay” turned out to be such a case. The other is that it is pretty unclear what makes it into a release and what does not. This makes it hard to test in advance and report bugs. One of the underlying problems is Apple’s very long release cycle and opaque roadmap. There are frequent grumblings about missing features and others like regressions (such as this from webrtcHacks author Das-Inge Aas) despite active community interest in the form of detailed bug reports. Safari is getting a lot of criticism these days. You may still find the post below useful for background on WebRTC NAT/Firewall traversal. Update: iOS 15.1 (released on October 27th 2021) makes private relay work with WebRTC. ![]()
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