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Page 121 / 249 Scroll up to view Page 116 - 120
Chapter 16 Network Address Translation (NAT)
NBG6515 User’s Guide
121
Figure 91
Network > NAT > Advanced
The following table describes the labels in this screen.
16.5.1
Trigger Port Forwarding Example
The following is an example of trigger port forwarding.
Table 60
Network > NAT > Advanced
LABEL
DESCRIPTION
Add Application Rule
Service Name
Type a unique name (up to 15 characters) for identification purposes. All characters are
permitted - including spaces.
Trigger Port
The trigger port is a port (or a range of ports) that causes (or triggers) the NBG to record
the IP address of the LAN computer that sent the traffic to a server on the WAN.
Select the transport layer protocol used for the service. Choices are
TCP
,
UDP
, or
Both
.
Type a port number or a range of port numbers.
Incoming Port
Incoming is a port (or a range of ports) that a server on the WAN uses when it sends out a
particular service. The NBG forwards the traffic with this port (or range of ports) to the
client computer on the LAN that requested the service.
Select the transport layer protocol used for the service. Choices are
TCP
,
UDP
, or
Both
.
Type a port number or a range of port numbers.
Application Rules Summary
#
This is the rule index number (read-only).
Active
This icon is turned on when the rule is enabled.
Name
This field displays a name to identify this rule.
Trigger Port
This field displays the protocol and the port number or a range of port numbers.
Incoming Port
This field displays the protocol and the port number or a range of port numbers.
Modify
Click the
Edit
icon to edit the port triggering rule.
Click the
Delete
icon to delete an existing rule.
Apply
Click
Apply
to save your changes back to the NBG.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 122 / 249
Chapter 16 Network Address Translation (NAT)
NBG6515 User’s Guide
122
Figure 92
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 NBG to record Jane’s computer IP address. The NBG
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 NBG 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 NBG
times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer
Control Protocol/Internet Protocol).
16.5.2
Two Points To Remember About Trigger Ports
1
Trigger events only happen on data that is going coming from inside the NBG 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.
Router
Router
Page 123 / 249
NBG6515 User’s Guide
123
C
HAPTER
17
Dynamic DNS
17.1
Overview
Dynamic DNS (DDNS) services let you use a domain name with a dynamic IP address.
17.2
What You Can Do
Use the
Dynamic DNS
screen (
Section 17.4 on page 123
) to enable DDNS and configure the DDNS
settings on the NBG.
17.3
What You Need To Know
Dynamic DNS allows you to update your current dynamic IP address with one or many dynamic
DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You can also access
your FTP server or Web site on your own computer using a domain name (for instance
myhost.dhs.org, where myhost is a name of your choice) that will never change instead of using an
IP address that changes each time you reconnect. Your friends or relatives will always be able to
call you even if they don't know your IP address.
17.4
Dynamic DNS Screen
To change your NBG’s DDNS, click
Network > DDNS
. The screen appears as shown.
Figure 93
Network > DDNS
Page 124 / 249
Chapter 17 Dynamic DNS
NBG6515 User’s Guide
124
The following table describes the labels in this screen.
Table 61
Network > DDNS
LABEL
DESCRIPTION
Enable
Dynamic DNS
Select this check box to use dynamic DNS.
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 (",").
User Name
Enter your user name.
Password
Enter the password assigned to you.
Apply
Click
Apply
to save your changes back to the NBG.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 125 / 249
NBG6515 User’s Guide
125
C
HAPTER
18
Static Route
18.1
Overview
This chapter shows you how to configure static routes for your NBG.
Each remote node specifies only the network to which the gateway is directly connected, and the
NBG has no knowledge of the networks beyond. For instance, the NBG knows about network N2 in
the following figure through remote node Router 1. However, the NBG is unable to route a packet to
network N3 because it doesn't know that there is a route through the same remote node Router 1
(via gateway Router 2). The static routes are for you to tell the NBG about the networks beyond the
remote nodes.
Figure 94
Example of Static Routing Topology
18.2
What You Can Do
Use the
IP Static Route
screen (
Section 18.3 on page 125
) to view, add and delete routes.
18.3
IP Static Route Screen
Click
Network > Static Route
to open the
IP Static Route
screen.

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