D-Link DFL-1500 [69/271] Dfl 900 1500 user manual chapter 7 nat

D-Link DFL-1500 [69/271] Dfl 900 1500 user manual chapter 7 nat
DFL-900/1500 User Manual Chapter 7
NAT
61
Chapter 7
NAT
This chapter introduces NAT and explains how to implement it in DFL-1500.
To facilitate the explanation on how DFL-1500 implements NAT and how to use it, we zoom in the left part of
Figure 1-10
into
Figure 7-1.
7.1 Demands
1. The number of public IP address allocated to each Internet subscribers is often very limited compared to the number of PCs
in the LAN1. Additionally, public-IP hosts are directly exposed to the Internet and have more chances to be cracked by
intruders. As the
Figure 7-1 illustrated, you hope all the pcs located at LAN1 and DMZ1 can connect internet through
limited IP address (61.2.1.1).
Figure 7-1 All the internal PCs can connect internet through limited WAN IP address by using NAT technology
2. Internet servers provided by your company may open many ports by default that may be dangerous if exposed to the public
Internet. As the
Figure 7-2 illustrated, we make the real servers hide behind the DFL-1500. And all the internet clients can
still access the service of servers.

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