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Page 106 / 236 Scroll up to view Page 101 - 105
Chapter 12 NAT
EMG2926-Q10A User’s Guide
106
12.5.3
Trigger Port Forwarding
Some services use a dedicated range of ports on the client side and a dedicated range of ports on
the server side. With regular port forwarding you set a forwarding port in NAT to forward a service
(coming in from the server on the WAN) to the IP address of a computer on the client side (LAN).
The problem is that port forwarding only forwards a service to a single LAN IP address. In order to
use the same service on a different LAN computer, you have to manually replace the LAN
computer's IP address in the forwarding port with another LAN computer's IP address.
Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take
turns using the service. The EMG2926-Q10A records the IP address of a LAN computer that sends
traffic to the WAN to request a service with a specific port number and protocol (a "trigger" port).
When the EMG2926-Q10A's WAN port receives a response with a specific port number and protocol
("incoming" port), the EMG2926-Q10A forwards the traffic to the LAN IP address of the computer
that sent the request. After that computer’s connection for that service closes, another computer on
the LAN can use the service in the same manner. This way you do not need to configure a new IP
address each time you want a different LAN computer to use the application.
12.5.4
Trigger Port Forwarding Example
The following is an example of trigger port forwarding.
Figure 62
Trigger Port Forwarding Process: Example
1
Jane requests a file from the Real Audio server (port 7070).
2
Port 7070 is a “trigger” port and causes the EMG2926-Q10A to record Jane’s computer IP address.
The EMG2926-Q10A associates Jane's computer IP address with the "incoming" port range of 6970-
7170.
3
The Real Audio server responds using a port number ranging between 6970-7170.
4
The EMG2926-Q10A forwards the traffic to Jane’s computer IP address.
5
Only Jane can connect to the Real Audio server until the connection is closed or times out. The
EMG2926-Q10A times out in three minutes with UDP (User Datagram Protocol), or two hours with
TCP/IP (Transfer Control Protocol/Internet Protocol).
Jane’s computer
Real Audio Server
Port 7070
Page 107 / 236
Chapter 12 NAT
EMG2926-Q10A User’s Guide
107
12.5.5
Two Points To Remember About Trigger Ports
1
Trigger events only happen on data that is coming from inside the EMG2926-Q10A and going to the
outside.
2
If an application needs a continuous data stream, that port (range) will be tied up so that another
computer on the LAN can’t trigger it.
Page 108 / 236
EMG2926-Q10A User’s Guide
108
C
HAPTER
13
DDNS
13.1
Overview
DDNS services let you use a domain name with a dynamic IP address.
13.1.1
What You Need To Know
The following terms and concepts may help as you read through this chapter.
What is DDNS?
Dynamic Domain Name Service (DDNS) services let you use a fixed domain name with a dynamic
IP address. Users can always use the same domain name instead of a different dynamic IP address
that changes each time to connect to the EMG2926-Q10A or a server in your network.
Note: The EMG2926-Q10A must have a public global IP address and you should have
your registered DDNS account information on hand.
13.2
General
To change your EMG2926-Q10A’s DDNS, click
Network > DDNS
. The screen appears as shown.
Figure 63
Dynamic DNS
Page 109 / 236
Chapter 13 DDNS
EMG2926-Q10A User’s Guide
109
The following table describes the labels in this screen.
Table 42
Dynamic DNS
LABEL
DESCRIPTION
Dynamic DNS
Select
Enable
to use dynamic DNS. Select
Disable
to turn this feature off.
Service Provider
Select the name of your Dynamic DNS service provider.
Host Name
Enter a host names in the field provided. You can specify up to two host names in the
field separated by a comma (",").
Username
Enter your user name.
Password
Enter the password assigned to you.
Apply
Click
Apply
to save your changes back to the EMG2926-Q10A.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Page 110 / 236
EMG2926-Q10A User’s Guide
110
C
HAPTER
14
Static Route
14.1
Overview
This chapter shows you how to configure static routes for your EMG2926-Q10A.
The EMG2926-Q10A usually uses the default gateway to route outbound traffic from computers on
the LAN to the Internet. To have the EMG2926-Q10A send data to devices not reachable through
the default gateway, use static routes.
For example, the next figure shows a computer (
A
) connected to the EMG2926-Q10A’s LAN
interface. The EMG2926-Q10A routes most traffic from
A
to the Internet through the EMG2926-
Q10A’s default gateway (
R1
). You create one static route to connect to services offered by your ISP
behind router
R2
. You create another static route to communicate with a separate network behind
a router
R3
connected to the LAN.
Figure 64
Example of Static Routing Topology
14.2
IP Static Route Screen
Click
Network > Static Route
to open the
Static Route
screen.
WAN
R1
R2
A
R3
LAN

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