Hi Matt, About bringing up both dns and transparent proxy network devices, can you share with me your code on how to start them only after the other? I tried different combinations inside AppDelegate.swift, with below way, only sometimes I can get both network devices added, other times only appproxy device can be seen. func applicationDidFinishLaunching(_ aNotification: Notification) {     ProxyManager.shared().loadProxyManager(connect: true) {       ProxyManager.shared().addObserver {}       ProxyManager.shared().start()       DNSManager.shared().start() {}     }   } About stability thing with both proxy running, have you observe its stability over time? I tried with below script and found sometimes it just get stuck there for a while then resume going on. #!/bin/bash i=0 while true do   i=$((i+1))   echo "loop $i"   nslookup google.com   sleep 1 done

Also, I am currently at BigSur 11.3.1. Which BigSur version are you in?

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Thanks a lot for this suggestion: by using netstat -vnp udp | wc -l, it is obvious the difference between BigSur and Monterey. On Monterey, the return value keeps increasing when doing dns request loop from < 100 all the way to thousands; while on BigSur, it is steady at around 46~48!

Done and shared via bug report.