ruby - Why can't I receive an ICMP Message? -

i want make simple traceroute without library.

in wireshark see incoming response, can't receive message. port receive_socket same port send_socket, , protocols specified should correct.

def traceroute   local_host = '0.0.0.0'   remote_host = '8.8.8.8'   traceroute_port = 33434   random_port = rand(10000..20000)    # create udp-socket   udp_socket = udpsocket::new   udp_socket.bind(local_host, random_port)   udp_socket.setsockopt( 0, socket::ip_ttl, 3)    # send data   udp_socket.connect(remote_host, traceroute_port)   udp_socket.send('traceroute', 0)    # create receive-socket   receive_socket = socket.open(socket::pf_inet, socket::sock_raw, socket::ipproto_icmp)   receive_socket.bind(socket.pack_sockaddr_in(random_port, local_host))    # receive data   begin     p receive_socket.recvfrom(1024)   rescue socketerror => exception     puts exception.message   end end 

it great if somone can me out.