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Page 71 / 141 Scroll up to view Page 66 - 70
ZyXEL P-330W User’s Guide
71
Chapter 6 Advanced Options
Figure 40
Advanced: Access Control
The following table describes the labels in this screen.
6.2
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 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.
Table 27
Advanced: Access Control
LABEL
DESCRIPTION
Enable Access Control
Check this box to enable Access Controls.
Select Services to
Block
The P-330W comes preconfigured with settings for many common services.
You can choose one to activate from the pull down menu.
Port Range
Enter in a range of ports to block.
Protocol
Choose to block either TCP, UDP, or Both.
Description
Give the rule you have created an easy to identify name.
Save
Click
Save
to save your changes back to the P-330W.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 72 / 141
ZyXEL P-330W User’s Guide
Chapter 6 Advanced Options
72
First of all, you need to have registered a dynamic DNS account with either www.dyndns.org
or www.tzo.com. 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.
6.3
Configuring Dynamic DNS
To change your P-330W’s DDNS, click
ADVANCED
then the
Dynamic DNS
link. The
screen appears as shown.
Figure 41
Advanced: Dynamic DNS
The following table describes the labels in this screen.
Note:
If you have a private WAN IP address, then you cannot
use Dynamic DNS.
Table 28
Advanced: Dynamic DNS
LABEL
DESCRIPTION
Enable DDNS
Select this check box to use dynamic DNS.
Service Provider
Select the name of your Dynamic DNS service provider.
Domain Name
Enter the host names in the field provided.
User Name
Enter your user name.
Password
Enter the password assigned to you.
Result
Tells you the current result from trying to register your IP address with the
DDNS provider.
Page 73 / 141
ZyXEL P-330W User’s Guide
73
Chapter 6 Advanced Options
6.4
DMZ
If the DMZ Host Function is enabled, it means that you set up DMZ host at a particular
computer to be exposed to the Internet so that some applications/software, especially Internet /
online game can have two-way connections. A device acting as DMZ is not protected by the P-
330W’s firewall.
To enable DMZ, click
ADVANCED
then the
DMZ
link. The screen appears as shown.
Figure 42
Advanced: DMZ
The following table describes the labels in this screen.
6.5
Virtual Servers (Port Forwarding)
The Virtual Server function is a list of inside (behind NAT on the LAN) servers, for example,
web or FTP, that you can make visible to the outside world even though NAT makes your
whole inside network appear as a single computer to the outside world.
Save
Click
Save
to save your changes back to the P-330W.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 28
Advanced: Dynamic DNS
LABEL
DESCRIPTION
Table 29
Advanced: DMZ
LABEL
DESCRIPTION
Enable DMZ
Select this check box to enable DMZ.
Host IP Address
Enter the IP address of the device you which to be accessible from the
Internet.
Save
Click
Save
to save your changes back to the P-330W.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 74 / 141
ZyXEL P-330W User’s Guide
Chapter 6 Advanced Options
74
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. You can allocate a server IP address that
corresponds to a port or a range of ports.
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.
The most often used port numbers are shown in the following table. Please refer to RFC 1700
for further information about port numbers. .
6.5.0.1
Configuring Servers Behind SUA (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
192.168.10.35 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
Table 30
Services and Port Numbers
SERVICES
PORT NUMBER
ECHO
7
FTP (File Transfer Protocol)
21
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System)
53
Finger
79
HTTP (Hyper Text Transfer protocol or WWW, Web)
80
POP3 (Post Office Protocol)
110
NNTP (Network News Transport Protocol)
119
SNMP (Simple Network Management Protocol)
161
SNMP trap
162
PPTP (Point-to-Point Tunneling Protocol)
1723
Page 75 / 141
ZyXEL P-330W User’s Guide
75
Chapter 6 Advanced Options
Figure 43
Multiple Servers Behind NAT Example
6.5.1
Configuring Virtual Servers
To configure Virtual Server, click
ADVANCED
then the
VIRTUAL SERVERS
link. The
screen appears as shown.
Figure 44
Advanced: Virtual Servers
The following table describes the labels in this screen.
Table 31
Advanced: Virtual Servers
LABEL
DESCRIPTION
Enable Virtual
Servers
Put a check in the box to enable Virtual Servers
Servers
By selection an option in the pull down menu, the P-330W will automatically
populate the settings for the corresponding service.

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