Interesting OSS project: Holesail creates instant P2P tunnels between networks (like a VPN)

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Reverse tunneling software | Holesail

https://holesail.io/

Holesail is the P2P company, building a truly peer to peer and open source reverse tunnelling software

Reverse tunneling software | Holesail

"Create P2P tunnels instantly that bypass any network, firewall, NAT restrictions and expose your local network to the internet securely, no Dynamic DNS required."