How to Recognize Hosts behind NAPTs
Pan Li-na · Journal of Changshu Institute of Technology · 2009
Internet connection is very important today.IP address has been assigned depending on IPv4,which is not enough.It must need more time to migrate from IPv4 to IPv6,so NAPT technology is used widely.ISP attempts to know how many hosts there are behind the NAPT device.There are two types of NAPT:software NAPT and hardware NAPT.The technique based on IPid,Source-port,TTL,analyzing the traffic packets can recognize whether NAPT had been used or not.It also can distinguish the server from the client by means of software NAPT. Depending on Cookies,it can recognize the number of clients.