L4Proxy is a rudimentary layer 4 proxy, currently supporting IPv4 TCP connections.
l4proxy -c l4proxy_example.yaml
telnet localhost 1313
you should now see you're connected to either one of your configured backends.l4proxy is really mostly a proof of concept for my use case of injecting traffic into my on-premise Kubernetes cluster so don't expect miracles from it. However, I appreciate any feedback so please don't hesitate filing issues or PRs.