Can you show the output of 'sudo ifconfig -a; sudo brctl show; sudo netstat -nr' ?
Does
nc -l -4 127.0.0.1 5555 & echo ab | nc -4 127.0.0.1 5555
work?
Can you show the output of 'sudo ifconfig -a; sudo brctl show; sudo netstat -nr' ?
Does
nc -l -4 127.0.0.1 5555 & echo ab | nc -4 127.0.0.1 5555
work?