User Manual

Chapter 10 NAT
LTE3301 Series User’s Guide
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• Use the ALG screen to enable or disable SIP (VoIP) ALG (Application Layer Gateway) in the LTE3301
(
Section 10.5 on page 92).
10.2 G e ne ra l Sc re e n
Use this screen to enable NAT and set a default server. Click Ne two rk > NAT to open the G e ne ra l screen.
Fig ure 55 Network > NAT > General
The following table describes the labels in this screen.
10.3 Po rt Fo rwa rding Sc re e n
Use this screen to forward incoming service requests to the server(s) on your local network and set a
default server. You may enter a single port number or a range of port numbers to be forwarded, and the
local IP address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can support
more than one service (for example both FTP and web service), it might be better to specify a range of
port numbers.
In addition to the servers for specified services, NAT supports a default server. A service request that does
not have a server explicitly designated for it is forwarded to the default server. If the default is not
defined, the service request is simply discarded.
Table 36 Network > NAT > General
LABEL DESCRIPTIO N
Network Address
Translation (NAT)
Network Address Translation (NAT) allows the translation of an Internet protocol address
used within one network (for example a private IP address used in a local network) to a
different IP address known within another network (for example a public IP address used on
the Internet).
Select Ena ble to activate NAT. Select Disa ble to turn it off.
NAT Loopback NAT loopback allows local users to use a domain name to access a server on the local
network. A packet sent to the public (WAN) IP address is always forwarded to the default
gateway (the LTE3301). With NAT loopback enabled, the LTE3301 uses the WAN interface’s
IP address as the packet’s source address and treats the packet as if it came from the WAN
interface. The packet then can be forwarded to the local server according to the port
forwarding rule.
Select Ena ble to activate NAT loopback. Select Disa b le to turn it off.
Apply Click A p ply to save your changes back to the LTE3301.
Cancel Click C a nc e l to begin configuring this screen afresh.