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Page 106 / 224 Scroll up to view Page 101 - 105
Chapter 10 Network Address Translation
NBG-418N User’s Guide
106
10.5
Technical Reference
The following section contains additional technical information about the NBG-418N features
described in this chapter.
10.5.1
NAT Port Forwarding: Services and Port Numbers
A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make accessible to the outside world even though NAT makes your whole inside
network appear as a single machine to the outside world.
Use the
Application
screen to forward incoming service requests to the server(s) on your local
network. 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.
Note: Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
Server IP Address
Type the inside IP address of the server that receives packets from the port(s) specified in
the
Port
field.
Apply
Click
Apply
to save your changes to the
Application Rules Summary
table.
Reset
Click
Reset
to not save and return your new changes in the
Service Name
and
Port
fields to the previous one.
Application Rules Summary
#
This is the number of an individual port forwarding server entry.
Active
This icon is turned on when the rule is enabled.
Name
This field displays a name to identify this rule.
Local Start/End
Port
Public Start/End
Port
This field displays the port number(s).
Protocol
This is the transport layer protocol used for the service.
Server IP Address
This field displays the inside IP address of the server.
Modify
Click the
Edit
icon to display and modify an existing rule setting in the fields under
Add
Application Rule
.
Click the
Remove
icon to delete a rule.
Table 47
Network > NAT > Application (continued)
LABEL
DESCRIPTION
Page 107 / 224
Chapter 10 Network Address Translation
NBG-418N User’s Guide
107
10.5.2
NAT Port Forwarding Example
Let's say 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 and the ISP assigns the WAN IP address.
The NAT network appears as a single host on the Internet.
Figure 76
Multiple Servers Behind NAT Example
Page 108 / 224
Chapter 10 Network Address Translation
NBG-418N User’s Guide
108
Page 109 / 224
NBG-418N User’s Guide
109
C
HAPTER
11
Dynamic DNS
11.1
Overview
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 NBG-418N or a server in your network.
Note: The NBG-418N must have a public global IP address and you should have your
registered DDNS account information on hand.
11.2
Dynamic DNS Screen
To configure your NBG-418N’s DDNS, click
Network > DDNS
.
Figure 77
Network > DDNS
The following table describes the labels in this screen.
Table 48
Network > DDNS
LABEL
DESCRIPTION
Enable
Dynamic DNS
Select this check box to use DDNS.
Service
Provider
Select the name of your DDNS service provider.
Dynamic DNS
Type
This field is only available if you use the DynDNS service provider.
Select the type of service that you are registered for from your Dynamic DNS service
provider.
Page 110 / 224
Chapter 11 Dynamic DNS
NBG-418N User’s Guide
110
Host Name
The host name is the domain name that the DDNS service will map to your dynamic global
IP address. Type the host name fully qualified, for example, ‘yourhost.mydomain.net’. You
can specify up to two host names in the field separated by a comma (",").
User Name
Type the user name that you used when you registered with the DDNS service.
Password
Type the password associated with the DDNS user name.
Timeout
This is the length of time in hours between updates to the DDNS service. If the update fails,
the NBG-418N will disable DDNS.
Enable
Wildcard Option
Select this if your DDNS service provider supports use of a wildcard (*) that will allow
‘*.yourhost.dyndns.org’ (where * may be the name of a web, mail, FTP etc. server in your
network) to be mapped to the same IP address as ‘yourhost.dyndns.org’. This feature is
useful when there are multiple servers in your network and you want users to be able to use
different domain names to reach them.
Apply
Click
Apply
to save your changes back to the NBG-418N.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 48
Network > DDNS
LABEL
DESCRIPTION

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