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Chapter 11 Dynamic DNS
NBG4604 User’s Guide
126
11.2
Dynamic DNS Screen
To change your NBG4604’s DDNS, click
Network > DDNS
. The screen appears as
shown.
Figure 76
Network > Dynamic DNS
The following table describes the labels in this screen.
Table 50
Network > Dynamic DNS
LABEL
DESCRIPTION
Dynamic DNS Setup
Enable Dynamic
DNS
Select this check box to use dynamic DNS.
Service Provider
Select the name of your Dynamic DNS service provider.
Dynamic DNS Type
This field is only available if you use the DynDNS service provider.
Select the type of DNS service you are using.
Use
Dynamic DNS
if you are using a dynamic IP address.
Use
Static DNS
if you are hosting a server with a static IP address.
Use
Custom DNS
if you want to keep hosts in your domain
automatically updated with dynamic IP addresses and you want
DynDNS to host its reverse DNS records.
Page 127 / 268
Chapter 11 Dynamic DNS
NBG4604 User’s Guide
127
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.
Token
Enter your client authorization key provided by the server to
update DynDNS records.
This field is configurable only when you select
WWW.REGFISH.COM
in the
Service Provider
field.
Enable Wildcard
Option
Select the check box to enable DynDNS Wildcard.
Enable off line
option
This option is available when
CustomDNS
is selected in the
DDNS
Type
field. Check with your Dynamic DNS service provider to have
traffic redirected to a URL (that you can specify) while you are off
line.
IP Address Update Policy:
Use WAN IP Address
Select this option to update the IP address of the host name(s) to
the WAN IP address.
Dynamic DNS
server auto detect
IP Address
Select this option to update the IP address of the host name(s)
automatically by the DDNS server. It is recommended that you
select this option.
Use specified IP
Address
Type the IP address of the host name(s). Use this if you have a
static IP address.
Apply
Click
Apply
to save your changes back to the NBG4604.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 50
Network > Dynamic DNS (continued)
LABEL
DESCRIPTION
Page 128 / 268
Chapter 11 Dynamic DNS
NBG4604 User’s Guide
128
Page 129 / 268
NBG4604 User’s Guide
129
C
HAPTER
12
Firewall
12.1
Overview
Use these screens to enable and configure the firewall that protects your NBG4604
and your LAN from unwanted or malicious traffic.
Enable the firewall to protect your LAN computers from attacks by hackers on the
Internet and control access between the LAN and WAN. By default the firewall:
•
allows traffic that originates from your LAN computers to go to all of the
networks.
•
blocks traffic that originates on the other networks from going to the LAN.
The following figure illustrates the default firewall action. User
A
can initiate an IM
(Instant Messaging) session from the LAN to the WAN (
1
). Return traffic for this
session is also allowed (
2
). However other traffic initiated from the WAN is blocked
(
3
and
4
).
Figure 77
Default Firewall Action
Page 130 / 268
Chapter 12 Firewall
NBG4604 User’s Guide
130
12.2
What You Can Do
•
Use the
General
screen
(
Section 12.4 on page 131
) to enable or disable the
NBG4604’s firewall.
•
Use the
Access Control Rule
(
Section 12.5 on page 131
) screen to view the
configured access control rules and add, edit or remove a rule.
•
Use the
Services
screen (
Section 12.6 on page 134
) screen enable service
blocking, enter/delete/modify the services you want to block and the date/time
you want to block them.
12.3
What You Need To Know
The NBG4604’s firewall feature physically separates the LAN and the WAN and
acts as a secure gateway for all data passing between the networks.
12.3.1
About the NBG4604 Firewall
The NBG4604 firewall is a stateful inspection firewall and is designed to protect
against Denial of Service attacks when activated (click
the
General
tab under
Firewall
and then click the
Enable
Firewall
check box). The NBG4604's purpose
is to allow a private Local Area Network (LAN) to be securely connected to the
Internet. The NBG4604 can be used to prevent theft, destruction and modification
of data, as well as log events, which may be important to the security of your
network.
The NBG4604 is installed between the LAN and a broadband modem connecting to
the Internet. This allows it to act as a secure gateway for all data passing between
the Internet and the LAN.
The NBG4604 has one Ethernet WAN port and four Ethernet LAN ports, which are
used to physically separate the network into two areas.The WAN (Wide Area
Network) port attaches to the broadband (cable or DSL) modem to the Internet.
The LAN (Local Area Network) port attaches to a network of computers, which
needs security from the outside world. These computers will have access to
Internet services such as e-mail, FTP and the World Wide Web. However, "inbound
access" is not allowed (by default) unless the remote host is authorized to use a
specific service.

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