###Synopsis
This module provide a method to tackle with network attacks.
eg , you could set the LIMIT number of connections a client/ip could hold
when it reaches to this limit , just close the socket...
###Usage
After you create a tcp/http server :
var MAX_CONN_PER_IP = 10;
var doFilter = require('./server_filter').fn;
doFilter(server, MAX_CONN_PER_IP);