tcptee is a simple tcp traffic duplicator.
./tcptee -bind :8000 -backends :2015,:2016,:2017
go run echo_server.go -bind :8001
go run echo_server.go -bind :8002
go run tcptee.go -bind :8000 -backends :8001,:8002
echo 'Hello world' | nc 127.0.0.1 8000
Or run this script: example.sh
BSD.