rebuild tunnel from https://github.com/i183/tunnel
enter code directory run
make
or
mkdir build && cd build && cmake ../. && make
run tunneld at 192.168.16.193,run tunnel at 192.168.16.125
after tunnel connected tunneld,tunnel will get a port number(33626)
then send data to 192.168.16.192:33626,tunneld will transfer the data to 192.168.16.125:80(80 port can be specified by configure file)