Um, there is user-level implementation of TCP/IPv4+IPv6 stack in Go [0], developed and used by Google as part of its gVisor. [0] https://github.com/google/nets

Um, there is user-level implementation of TCP/IPv4+IPv6 stack in Go [0], developed and used by Google as part of its gVisor. [0] https://github.com/google/netstack https://github.com/google/netstack