("Common NAT Configuration" 1. Dynamic NAT configuration Dynamic NAT is generally used to obtain legal public IP from the public IP address pool for external access when multiple private IPs in the local area network are exiting. It is assumed that the internal LAN uses the 10.0.0.0 network, and the public IP addresses 133.1.1.33~133.1.1.62 are an address pool. When the internal network wants to access the external network, the public IP is obtained from the address pool.)