ZyXEL Communications LTE3311 series - 10.3 Port Forwarding Screen

Chapter 10 NAT
LTE3311 Series User’s Guide
92
•Use the Port Trigger screen to change your LTE3311’s trigger port settings (Section 10.4 on
page 95).
•Use the ALG screen to enable or disable SIP (VoIP) ALG (Application Layer Gateway) in the
LTE3311 (Section 10.5 on page 96).
10.2 General Screen
Use this screen to enable NAT and set a default server. Click Network > NAT to open the General
screen.
Figure 56 Network > NAT > General
The following table describes the labels in this screen.
10.3 Port Forwarding Screen
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.
Table 37 Network > NAT > General
LABEL DESCRIPTION
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 Enable to activate NAT. Select Disable 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 LTE3311). With NAT loopback enabled, the LTE3311 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 Enable to activate NAT loopback. Select Disable to turn it off.
Apply Click Apply to save your changes back to the LTE3311.
Cancel Click Cancel to begin configuring this screen afresh.