User's Manual

SPEEDLAN 9000 Installation and Operation User Guide
5-10 Basics of IP Addressing
Diagram of Outgoing NAT
As the packet is transmitted from the private network (in Building B) across the public network (public
address in Building A and the Internet), the packet will be re-addressed as 204.101.20.3 (public
address). When the packet returns to SPEEDLAN SectorPRC interface B, the packet will be re-
addressed to the IP address of the private network by using the MAC address contained in the
header to identify the destination.
Inbound Port 80 request is re-addressed
to Private address 10.0.0.3. Then, it is
forwarded across the private network
Internet
Ethernet
Router
204.101.20.1
Private Address on Local Interface
10.0.0.1
10.0.0.2
10.0.0.4
Ethernet
Public Address on Remote Interface
204.101.20.3
Building A Building B
SPEEDLAN 9000 Router
204.101.20.0
SPEEDLAN 9000 Router
10.0.03