FYI
I found very little info about Per-App VPNs. Most documents go over the configuration files.
Start with Network Extension Docs
https://developer.apple.com/documentation/networkextension
NETunnelProviderManager and NEAppProxyProvider provide the most direct info on Per-App VPNs.
NETunnelProviderManager
https://developer.apple.com/documentation/networkextension/netunnelprovidermanager
NEAppProxyProvider
https://developer.apple.com/documentation/networkextension/neappproxyprovider
Phred
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How does that differ from using a Packet Tunnel? Can you point me in right direction to get started?
Ken