Asus SL1200 - Manual (Page 80)

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Chapter 9 - Configuring Firewall/NAT Settings
ASUS SL1200
9.2.3 Network Address and Port Translation (NAPT) or
Port Address Translation (PAT)
This mapping is also called IP Masquerading. This maps many internal
hosts to one globally valid Internet address. The mapping contains a pool
of network ports to be used for translation. Every packet is translated with
the globally valid Internet address and the port number is translated with
an available port from the pool of network ports. Figure 9.4 shows that all
the hosts on the local network gain access to the Internet by mapping to
only one globally valid IP address and different port numbers from a free
pool of network ports.
Figure 9.4 NAPT – Map Any Internal PCs to a Single Global IP Address
Figure 9.5 Reverse Static NAT – Map
a Global IP Address to An Internal
PC
Figure 9.6 Reverse NAPT – Relayed
Incoming Packets to the Internal
Host Base on the Protocol, Port
Number or IP Address