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Page 256 / 421 Scroll up to view Page 251 - 255
Chapter 17 Remote Management
P-660HN-FxZ Series User’s Guide
253
"
If you want your device to respond to pings and requests for unauthorized
services, you may also need to configure the firewall anti probing settings to
match.
Figure 151
Advanced > Remote Management > ICMP
The following table describes the labels in this screen.
Table 96
Advanced > Remote Management > ICMP
LABEL
DESCRIPTION
ICMP
Internet Control Message Protocol 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.
Respond to Ping
on
The ZyXEL Device will not respond to any incoming Ping requests when
Disable
is
selected. Select
LAN
to reply to incoming LAN Ping requests.
Select
WAN
to reply
to incoming WAN Ping requests. Otherwise select
LAN & WAN
to reply to both
incoming LAN and WAN Ping requests.
Do not respond to
requests for
unauthorized
services
Select this option to prevent hackers from finding the ZyXEL Device by probing for
unused ports. If you select this option, the ZyXEL Device will not respond to port
request(s) for unused ports, thus leaving the unused ports and the ZyXEL Device
unseen. If this option is not selected, the ZyXEL Device will reply with an ICMP port
unreachable packet for a port probe on its unused UDP ports and a TCP reset
packet for a port probe on its unused TCP ports.
Note that the probing packets must first traverse the ZyXEL Device's firewall rule
checks before reaching this anti-probing mechanism. Therefore if a firewall rule
stops a probing packet, the ZyXEL Device reacts based on the firewall rule to
either send a TCP reset packet for a blocked TCP packet (or an ICMP port-
unreachable packet for a blocked UDP packets) or just drop the packets without
sending a response packet.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Page 257 / 421
Chapter 17 Remote Management
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Page 258 / 421
P-660HN-FxZ Series User’s Guide
255
C
HAPTER
18
Universal Plug-and-Play (UPnP)
18.1
Overview
Universal Plug and Play (UPnP) is a distributed, open networking standard that uses TCP/IP
for simple peer-to-peer network connectivity between devices. A UPnP device can
dynamically join a network, obtain an IP address, convey its capabilities and learn about other
devices on the network. In turn, a device can leave a network smoothly and automatically
when it is no longer in use.
18.1.1
What You Can Do in the UPnP Screen
Use the
UPnP
screen (
Section 18.2 on page 256
) to enable UPnP on the ZyXEL Device and
allow UPnP-enabled applications to automatically configure the ZyXEL Device.
18.1.2
What You Need to Know About UPnP
Identifying UPnP Devices
UPnP hardware is identified as an icon in the Network Connections folder (Windows XP).
Each UPnP compatible device installed on your network will appear as a separate icon.
Selecting the icon of a UPnP device will allow you to access the information and properties of
that device.
NAT Traversal
UPnP NAT traversal automates the process of allowing an application to operate through
NAT. UPnP network devices can automatically configure network addressing, announce their
presence in the network to other UPnP devices and enable exchange of simple product and
service descriptions. NAT traversal allows the following:
•
Dynamic port mapping
•
Learning public IP addresses
•
Assigning lease times to mappings
Windows Messenger is an example of an application that supports NAT traversal and UPnP.
See the NAT chapter for more information on NAT.
Cautions with UPnP
The automated nature of NAT traversal applications in establishing their own services and
opening firewall ports may present network security issues. Network information and
configuration may also be obtained and modified by users in some network environments.
Page 259 / 421
Chapter 18 Universal Plug-and-Play (UPnP)
P-660HN-FxZ Series User’s Guide
256
When a UPnP device joins a network, it announces its presence with a multicast message. For
security reasons, the ZyXEL Device allows multicast messages on the LAN only.
All UPnP-enabled devices may communicate freely with each other without additional
configuration. Disable UPnP if this is not your intention.
UPnP and ZyXEL
ZyXEL has achieved UPnP certification from the Universal Plug and Play Forum UPnP™
Implementers Corp. (UIC). ZyXEL's UPnP implementation supports Internet Gateway Device
(IGD) 1.0.
See the following sections for examples of installing and using UPnP.
18.2
The UPnP Screen
Use the following screen to configure the UPnP settings on your ZyXEL Device. Click
Advanced > UPnP
to display the screen shown next.
See
Section 18.1 on page 255
for more information.
Figure 152
Advanced > UPnP > General
The following table describes the fields in this screen.
Table 97
Advanced > UPnP > General
LABEL
DESCRIPTION
Active the Universal Plug
and Play (UPnP) Feature
Select this check box to activate UPnP. Be aware that anyone could
use a UPnP application to open the web configurator's login screen
without entering the ZyXEL Device's IP address (although you must still
enter the password to access the web configurator).
Allow users to make
configuration changes
through UPnP
Select this check box to allow UPnP-enabled applications to
automatically configure the ZyXEL Device so that they can
communicate through the ZyXEL Device, for example by using NAT
traversal, UPnP applications automatically reserve a NAT forwarding
port in order to communicate with another UPnP enabled device; this
eliminates the need to manually configure port forwarding for the UPnP
enabled application.
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Chapter 18 Universal Plug-and-Play (UPnP)
P-660HN-FxZ Series User’s Guide
257
18.3
Installing UPnP in Windows Example
This section shows how to install UPnP in Windows Me and Windows XP.
Installing UPnP in Windows Me
Follow the steps below to install the UPnP in Windows Me.
1
Click
Start
and
Control Panel
. Double-click
Add/Remove Programs
.
2
Click on the
Windows Setup
tab and select
Communication
in the
Components
selection box. Click
Details
.
Figure 153
Add/Remove Programs: Windows Setup: Communication
3
In the
Communications
window, select the
Universal Plug and Play
check box in the
Components
selection box.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 97
Advanced > UPnP > General
LABEL
DESCRIPTION

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