1. Home
    2. /
  2. Manuals
    3. /
  3. Zyxel
    4. /
  4. P-661HNU-F1
    5. /
  5. 40
Page 196 / 404 Scroll up to view Page 191 - 195
Chapter 11 Network Address Translation (NAT)
P-661HNU-Fx User’s Guide
196
and port numbers so incoming reply packets can have their original values
restored. The following figure illustrates this.
Figure 80
How NAT Works
192.168.1.13
192.168.1.10
192.168.1.11
192.168.1.12
SA
192.168.1.10
SA
IGA1
Inside Local
IP Address
192.168.1.10
192.168.1.11
192.168.1.12
192.168.1.13
Inside Global
IP Address
IGA 1
IGA 2
IGA 3
IGA 4
NAT Table
WAN
LAN
Inside Local
Address (ILA)
Inside Global
Address (IGA)
Page 197 / 404
P-661HNU-Fx User’s Guide
197
C
HAPTER
12
Dynamic DNS
12.1
Overview
This chapter discusses how to configure your ZyXEL Device to use Dynamic DNS.
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 applications such
as NetMeeting and CU-SeeMe). 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.
First of all, you need to have registered a dynamic DNS account with
www.dyndns.org. This is for people with a dynamic IP from their ISP or DHCP
server that would still like to have a domain name. The Dynamic DNS service
provider will give you a password or key.
12.1.1
What You Need To Know
DYNDNS Wildcard
Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be
aliased to the same IP address as yourhost.dyndns.org. This feature is useful if
you want to be able to use, for example, www.yourhost.dyndns.org and still reach
your hostname.
If you have a private WAN IP address, then you cannot use Dynamic DNS.
Page 198 / 404
Chapter 12 Dynamic DNS
P-661HNU-Fx User’s Guide
198
12.2
The Dynamic DNS Screen
Use the
Dynamic DNS
screen to enable DDNS and configure the DDNS settings
on the ZyXEL Device. To change your ZyXEL Device’s DDNS, click
Network
Setting > Dynamic DNS
. The screen appears as shown.
Figure 81
Network Setting > DNS
The following table describes the fields in this screen.
Table 47
Network Setting > DNS
LABEL
DESCRIPTION
Dynamic DNS Configuration
Active
Dynamic DNS
Select this check box to use dynamic DNS.
Service
Provider
Select the name of your Dynamic DNS service provider.
Dynamic DNS
Type
Select the type of service that you are registered for from your Dynamic
DNS service provider.
Host Name
Type the domain name assigned to your ZyXEL Device by your Dynamic
DNS provider.
You can specify up to two host names in the field separated by a comma
(",").
User Name
Type your user name.
Password
Type the password assigned to you.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Page 199 / 404
P-661HNU-Fx User’s Guide
199
C
HAPTER
13
Firewall
13.1
Overview
Use the ZyXEL Device firewall screens to enable and configure the firewall that
protects your ZyXEL Device and network from attacks by hackers on the Internet
and control access to it. By default the firewall:
•
allows traffic that originates from your LAN and WLAN computers to go to all
other networks.
•
blocks traffic that originates on other networks from going to the LAN and
WLAN.
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 82
Default Firewall Action
13.1.1
What You Can Do in this Chapter
•
Use the
General
screen to enable or disable the ZyXEL Device’s firewall
(
Section 13.2 on page 201
).
•
Use the
Services
screen to view the configured firewall rules and add, edit or
remove a firewall rule (
Section 13.3 on page 201
).
WAN
LAN
3
4
1
2
A
Page 200 / 404
Chapter 13 Firewall
P-661HNU-Fx User’s Guide
200
13.1.2
What You Need to Know
Firewall
The ZyXEL Device’s firewall feature physically separates the LAN/WLAN and the
WAN and acts as a secure gateway for all data passing between the networks.
It is designed to protect against Denial of Service (DoS) attacks when activated.
The ZyXEL Device's purpose is to allow a private Local Area Network (LAN) to be
securely connected to the Internet. The ZyXEL Device 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 ZyXEL Device is installed between the LAN/WLAN 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 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.
ICMP
Internet Control Message Protocol (ICMP) is a message control and error-reporting
protocol between a host server and a gateway to the Internet. ICMP uses Internet
Protocol (IP) datagrams, but the messages are processed by the TCP/IP software
and directly apparent to the application user.
Finding Out More
See
Section 13.4 on page 203
for advanced technical information on firewall.

Rate

4 / 5 based on 1 vote.

Popular Zyxel Models

Famous Router IPs
Famous Router Companies
Bookmark Our Site

Press Ctrl + D to add this site to your favorites!

Share
Top