METHOD, APPRATUS, SYSTEM AND COMPUTER-READABLE RECORDING MEDIUM FOR ACQUIRING INFORMATION ON PRIVATE IP ADDRESS BEFORE NAT

摘要

PURPOSE: A method, apparatus, system and computer-readable recording medium for acquiring information on a private IP address before NAT are provided to obtain private IP address information before NAT(Network Address Translation) by offering various algorithms for minimizing the volume of a mapping table or packet header information. CONSTITUTION: A communication network is composed of a private network(10) and an authorized network(20). A mirroring server(250) is interlocked with a private network switch(200). The private network refers to a communication network before an NAT apparatus(300) based on the NAT apparatus. The authorized network refers to the communication network beyond the NAT apparatus. The private network switch performs a function transferring the packet delivered from a source host(100) to the NAT apparatus.