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ZyXEL LTE3316-M604 Manual

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LTE3316-M604 User’s Guide
93
CHAPTER 11
NAT
11.1 Overview
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in a
packet. For example, the source address of an outgoing packet, used within one network is changed to
a different IP address known within another network.
The figure below is a simple illustration of a NAT network. You want to assign ports 21-25 to one FTP, Telnet
and SMTP server (A in the example), port 80 to another (B in the example) and assign a default server IP
address of 192.168.1.35 to a third (C in the example).
You assign the LAN IP addresses to the devices (A to D) connected to your LTE. The ISP assigns the WAN
IP address. The NAT network appears as a single host on the Internet. All traffic coming from A to D going
out to the Internet use the IP address of the LTE, which is 192.168.1.1.
Figure 48 NAT Example
Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from the
WAN to be forwarded through the LTE.
11.1.1 What You Can Do
• Use the General screen to enable NAT (Section 11.2 on page 94).
• Use the Port Forwarding screen to set a default server and change your LTE’s port forwarding settings
to forward incoming service requests to the servers on your local network (Section 11.3 on page 94).
• Use the Port Trigger screen to change your LTE’s trigger port settings (Section 11.4 on page 98).
LTE
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