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#coding:utf-8
import socket,time,sys
def proxy_server():
    client_addr = 0
    conn = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
    conn.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
    conn_addr = ('192.168.0.10',9999)           
    conn.bind(('',2222))                   
    while 1:
        print "Start the proxy.........."
        datas,addr = conn.recvfrom(1024)
        if not addr[0] == '192.168.0.10':
            try:
                conn.sendto(datas,conn_addr)
                client_addr = addr
            except:
                print "s"
        else:
            conn.sendto(datas,client_addr)

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Python code:

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