User's Manual

Configuring GRE, NAT, RIPSO, and BFE Services
2-4
308625-14.00 Rev 00
In Figure 2-1, a packet from company A’s network with unregistered source
address 10.0.0.15 is sent to a destination address in company B’s network. The
destination is a globally recognized registered address, 192.100.20.2. The packet
follows normal IP routing to the NAT border router at the egress point in company
A.
Figure 2-1. Network Address Translation Example
Boston
Atlanta
New York
Santa Clara
London
New York
Houston
Chicago
(NAT router)
10.0.0.15
10.0.0.1
10.0.0.50
50.1.1.52
192.100.20.2
15.0.0.45
15.0.0.20
Company A Company B
Unregistered source address
Registered destination address
IP0051A