Chapter 5 WAN Setup
send them to the server at IP address 1, port A. Packets have not been sent from 1, A to 3 or 5, so 3 and 5 cannot send packets to 1, A.
Figure 53 Restricted Cone NAT Example
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Port Restricted Cone NAT
Port restricted cone NAT maps all outgoing packets from an internal IP address and port to a single IP address and port on the external network. In the following example, the
A server with IP address 1 and port A sends packets to IP address 3, port C and IP address 4, port D. The
Since 1, A has already sent packets to 3, C and 4, D, they can send packets back to 2, B and the
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