![]() ![]() The responses include a type CNAME answer mask-api.fe., along with many type A answers. The client first sent two DNS queries of type A and HTTPS for.The client will then select the first answer in the responses.The client thus has to send another two DNS queries of type A and HTTPS for. The client appears to select the first answer in the reponses, which is the CNAME one.The responses include a type CNAME answer, along with many type A answers. The client first sends two DNS queries of type A and HTTPS for. ![]() In practice, we observed two ways for the client to get an IP address of the resolvers. Avoid causing DNS resolution timeouts or silently dropping IP packets sent to the Private Relay server, as this can lead to delays on client devices. The fastest and most reliable way to alert users is to return a negative answer from your network’s DNS resolver, preventing DNS resolution for the following hostnames used by Private Relay traffic. Actually, Apple suggests DNS hijacking as "he fastest and most reliable way" to block Private Relay: Since these DNS queries are (possibly intentionally) sent in plaintext, it is vulnerable to the DNS poisoning attack. DNS hijackingĪs introduced above, the client needs to get an IP address of the ingress relay before initiating QUIC connections to it. In this section, we measure current censorship in China, and discuss the cost for a censor to detect and block Private Relay using commonly used censorship methods. _type = 0 or udp.port = 53 Measure current censorship and evaluate potential censorship cost Below is the script we used to setup the hotspot, which was borrowed from this tutorial. We then captured and analyzed the traffic from the laptop. However, the iCloud Private Relay feature appears to be disabled when a VPN is used.Īs an alternative, we set up a WiFi hotspot from the desktop and let the iPhone connect to it. To capture and analyze the traffic from a mobile device, one intuitive way is to set up a VPN that works at the network layer, tunneling all the traffic at the transport layer and above to a (local) server, where tcpdump or wireshark can be run. Step 3: The traffic between the egress relays and websites is exactly the same as traffic between clients and websites when no Private Relay is used.Ĭapture traffic between an iPhone and relays. ![]()
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