ZyXEL P-870HN-51b User Guide - Page 99
Symmetric NAT,
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Chapter 5 WAN Setup external network. The Device also performs NAT on all incoming packets sent to IP address 2 and port B and forwards them to IP address 1, port A. Figure 45 Full Cone NAT Example 1, A 2, B Symmetric NAT The full, restricted and port restricted cone NAT types use the same mapping for an outgoing packet's source address regardless of the destination IP address and port. In symmetric NAT, the mapping of an outgoing packet's source address to a source address in another network is different for each different destination IP address and port. In the following example, the Device maps the source address IP address 1 and port A to IP address 2 and port B on the external network for packets sent to IP address 3 and port C. The Device uses a different mapping (IP address 2 and port M) for packets sent to IP address 4 and port D. A host on the external network (IP address 3 and port C for example) can only send packets to the internal host via the external IP address and port that the NAT router used in sending a packet to the external host's IP address and port. So in P-870HN-5xb User's Guide 99