ZyXEL Communications P-660 series Guia do Utilizador descarregar pdf (Página 174)

P-660R-F1 Series User’s Guide 174

CHAPTER 14

Universal Plug-and-Play (UPnP)

This chapter introduces the UPnP feature in the web configurator.

14.1 Introducing Universal Plug and Play

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.

See Section 14.2.1 on page 175 for configuration instructions.

14.1.1 How do I know if I'm using UPnP?

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.

14.1.2 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.

14.1.3 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.

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.

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ZyXEL Communications P-660 series Guia do Utilizador Página 174