I'm trying to build an iOS app that lists all requests that are made from the device, like Charles Proxy does. Much like Charles, my idea has been to create a Packet Tunnel Provider and have it setup a local VPN connection without an external VPN server. The traffic would then be internally routed to the packet tunnel, without requiring an external VPN server.
Since Charles Proxy does so, I know that it is technically possible, but I can't find any information about how to setup a tunnel with an internal VPN connection, instead of using a "real" external VPN server. The only resource people refers to is the SimpleTunnel Apple sample project, which is a couple years old and written in Swift 3.
I have downloaded the SimpleTunnel sample code project, created the correct entitlements and can now run the project and create a VPN configuration that gets listed under Settings, but I just can't connect the VPN tunnel. I have tried changing the server address to 127.1.0.0 and to use IKEv2, but without success. I have also downloaded the source code at https://github.com/lxdcn/NEPacketTunnelVPNDemo but didn't get it to work either.
Does anyone know how to setup an internal VPN server with NetworkExtensions and have the tunnel use that connection?
from How to setup Packet Tunnel Provider with device-internal VPN
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