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Table Of Contents
LTE3301 Series User’s Guide
87
C HAPTER 10
NAT
10.1 O ve rvie w
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 LTE3301. 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 LTE3301, which is 192.168.1.1.
Fig ure 54 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 LTE3301.
10.1.1 Wha t Yo u C a n Do
• Use the G e ne ra l screen to enable NAT (
Section 10.2 on page 88).
• Use the Po rt Fo rwa rding screen to set a default server and change your LTE3301’s port forwarding
settings to forward incoming service requests to the server(s) on your local network (Section 10.3 on
page 88
).
• Use the Po rt Trig g e r screen to change your LTE3301’s trigger port settings (
Section 10.4 on page 91).