Chapter 7 Nat - Planet Networking & Communication MH-5001 User Manual

MH-5001 User Manual
To facilitate the explanation on how MH-5001 implements NAT and how to use it, we zoom in the left part of Figure 1- 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 in 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 Wall-1 - MH-5001. And all the Internet
clients can still access the service of servers.
This chapter introduces NAT and explains how to implement it in MH-5001.
59
Chapter 7
NAT
Chapter 7
NAT