What is the crowd's opinion of OnionCat?

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It is possibly to set up trackers that work entirely inside Tor, using a piece of shim software that creates a virtual network interface with an IP mapped to your public/private Tor keypair called Onioncat https://www.onioncat.org/

I believe there are active trackers inside Tor that use it, but not sure

> OB is designed specifically to disallow onion routing.

That isn't the reason for UDP. NAT traversal is. If everyone was on ipv6 UDP wouldn't be used.

> Again TOR will not work with OB.

See https://www.onioncat.org/

UDP can be tunneled through Tor hidden services

Yes, but not natively. As a SOCKS proxy applications need to use it specifically, but there are other projects which can give it a VPN-style network adapter like https://www.onioncat.org/

• OnionCat is a VPN-adapter which allows to connect two or more computers or networks through VPN-tunnels. It is designed to use the anonymization networks r/Tor or r/I2P as its transport, hence, it provides location-based anonymity and surveillance protection while still creating tunnel end points with private unique IP addresses.