Done and shared via bug report.

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!

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

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