On macOS UDP traffic always leaks when using SOCKS proxy #2305
kouwei32
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Setting a SOCKS proxy within the config only proxies TCP (usually DNS over HTTPS) traffic. All other traffic is directly sent from the client bypassing the proxy. This can be observed from the Berkeley Packet Filter.
The SOCKS proxy is confirmed to support UDP properly as other applications can use it just fine. Blocking all UDP traffic and relying on DoH alone is okay as an interim workaround from my testing.
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