Question

I am a newbie to python, and just few days back I started trying my hands on network programming(I am a newbie there too)

Now I found a neat client server program which was running quite simply on my computer, but when I replaced the local addresses, and told my friend to run the client script, it just wont respond.

My global I.P address : 120.59.XX.XXX

My Ipv4 address as returned by ipconfig : 192.168.1.2 (I am connected to internet through a router)

My gateway address : 192.168.1.1

Port used : 1060 (I tested this port locally and it wasn’t in use)

#server.py

import socket
import sys

server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

MAX = 65535
PORT = 1060

server.bind(('192.168.1.2', PORT))
print 'Listening at', server.getsockname()
while True:
    data, address = server.recvfrom(MAX)
    print 'The client at', address, 'says', repr(data)
    server.sendto('Your data was %d bytes' % len(data), address)

Client Code :

#client.py

import socket
import sys

client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

PORT = 1060
MAX = 65536

client.sendto('Hello Server!', ('120.59.XX.XXX', PORT))
data, address = client.recvfrom(MAX)
print 'The server', address, 'says', repr(data)

I started server.py on my computer and told my friend to start client.py, I allowed incoming connections to python through firewall, also I added 1060 port to windows incoming connections list.

Still it is not responding, and I am unable to decipher why(I have a dynamic IP address, but for the current session it remains constant and hence should work, also 1060 is a well known port and shouldn’t be a problem right?)

Answer 1

You need to add a port forwarding rule in your router! something like from port 1060 forward to 192.168.1.2 port 1060.