Using UPnP

  1. What is UPnP
  2. Using UPnP in ZyXEL devices

1. What is UPnP

UPnP (Universal Plug and Play) makes connecting PCs of all form factors, intelligent appliances, and wireless devices in the home, office, and everywhere in between easier and even automatic by leveraging TCP/IP and Web technologies. UPnP can be supported on essentially any operating system and works with essentially any type of physical networking media ¡V wired or wireless.

UPnP also supports NAT Traversal which can automatically solve many NAT unfriendly problems. By UPnP, applications assign the dynamic port mappings to Internet gateway and delete the mappings when the connections are complete.

The key components in UPnP are devices, services, and control points.

UPnP Operations


2. Using UPnP in ZyXEL devices

In this example, we will introduce how to enable UPnP function in ZyXEL devices. Currently, Microsoft MSN is the most popular application exploiting UPnP, so we take Microsoft MSN application as an example in this support note. You can learn how MSN benefit from NAT traversal feature in UPnP in this application note. 

In the diagram, suppose PC1 and PC2 both sign in MSN server, and they would like to establish a video conference. PC1 is behind PPPoE dial-up router which supports UPnP. Since the router supports UPnP, we don't need to setup NAT mapping for PC1. As long as we enable UPnP function on the router, PC1 will assign the mapping to the router dynamically. Note that since PC1 must support UPnP, we presume that it's OS is Microsoft WinME or WinXP.

Device: Prestige Router
Service: NAT function provided by Prestige Router
Control Point: PC1

1. Enable UPnP function in ZyXEL device

Go to Advanced->UPnP, check two boxes, Enable UPnP service and Allow users to make configuration changes through UPnP.

The first check box enables UPnP function in this device.

The second check box allow users' application to change configuration in this device. For instance, if you enable this item, then user's MSN application can assign dynamic port mapping to the router. So that network administrator don't need to setup SUA port mapping in the router.

2. After getting IP address, you can go to open MSN application on PC and sign in MSN server.

3. Start a Video conversation with one online user.

4. On the opposite side, your partner select Accept to accept your conversation request.

5. Finally, your video conversation is achieved.


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