Networking Nightmare

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Because of permissions differences between Mac and Linux I use Vagrant on my Mac and then launch Docker from in there.

In there I have a VPN container and I then have several services/apps I want to run through that VPN container. Those apps have http front ends for control and configuration.

But for the life of me I cannot work out what the URLs for those apps will be.

I am totally confused by the Mac -> Vagrant -> Docker -> VPN -> Application path.

Anyone know of an nmap type tool that can reach into this chain and pull out available URLs/ports?