Network system, center router, base router, update method of NAPT table

摘要

The NAPT tables of the center side router and the base side router are synchronously updated to obtain a network system capable of reducing the management load of the NAPT table and preventing the setting errors and reducing the workload. The center side router sets a temporary port number used in communication between the center side router and the base side router based on the device information of the communication device connected to the base side router and sets its own NAPT table And transmits the temporary port number to the base station side router, and the base station side router updates its NAPT table by using the received temporary port number.