D-Link DFL-1500 [79/271] One to one bidirectional type

D-Link DFL-M510 [79/271] One to one bidirectional type
DFL-900/1500 User Manual Chapter 7
NAT
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Figure 7-6 NAT One-to-One type
As the above
Figure 7-6 illustrated, NAT One-to-One type means that each local PC is translated into a unique public IP address
when the packets are forwarded out through the DFL-1500. Take Connection1 for example. Its IP address and port are translated
from 192.168.40.1:2933 to 61.2.1.1:2933. But, when the packets of Connection2 are forwards out, the source IP address is translated
to another dedicated public IP address(61.2.1.2:7896).
7.5.4 One-to-One (bidirectional) type
Figure 7-7 NAT One-to-One (bidirectional) type
As the above
Figure 7-7 illustrated, NAT One-to-One (bidirectional) type means that each local PC is translated into a unique public
IP address when the packets are forwarded out through the DFL-1500. Besides, when packets came from internet to LAN, they were
translated to the same private IP address too. Take Connection1 for example. Its IP address and port are translated from
192.168.40.1:2933 to 61.2.1.1:2933 in both ways. Accordingly, the source IP address and port of the Connection2 are translated
from 192.168.40.100:7896 to 61.2.1.2:7896 in both ways.
7.5.5 NAT modes & types
The following three NAT modes are supported by DFL-1500 now as the following Table 7-4.
NAT mode Description
None
If you choose this mode, the DFL-1500 will act as a pure router without performing any address
translation.
Basic
The DFL-1500 automatically performs Many-to-One NAT for all LAN/DMZ subnets. All IP addresses
with outgoing packets will be translated to the IP address of default WAN link automatically.
Full Feature
The DFL-1500 can be manually configured with Many-to-One, and Many-to-Many, One-to-One, and
bidirectional One-to-One rules to do policy-based NAT. Here policy-based NAT means that you can fully
decide which zone (LAN, DMZ) will do the IP NAT and which zone (LAN, DMZ) will just do the pure IP
routing without IP translation.
Table 7-4 NAT modes overview

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