ZyWALL Series CLI Reference Guide
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CHAPTER 26
UPnP
26.1 UPnP and NAT-PMP Overview
The Zyxel Device supports both UPnP and NAT-PMP to permit networking devices to discover each other
and connect seamlessly.
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. A gateway that
supports UPnP is called Internet Gateway Device (IGD). The standardized Device Control Protocol (DCP)
is defined by the UPnP Forum for IGDs to configure port mapping automatically.
NAT Port Mapping Protocol (NAT-PMP), introduced by Apple and implemented in current Apple
products, is used as an alternative NAT traversal solution to the UPnP IGD protocol. NAT-PMP runs over
UDP port 5351. NAT-PMP is much simpler than UPnP IGD and mainly designed for small home networks. It
allows a client behind a NAT router to retrieve the router’s public IP address and port number and make
them known to the peer device with which it wants to communicate. The client can automatically
configure the NAT router to create a port mapping to allow the peer to contact it.
26.2 UPnP and NAT-PMP Commands
The following table lists the ip upnp commands. You must use the configure terminal command
to enter the configuration mode before you can use these commands.
Table 108 ip upnp Commands
COMMAND DESCRIPTION
ip upnp Enters the config-upnp sub-command mode to configure the UPnP or NAT-
PMP settings.
[no] bypass-firewall
activate
Allows traffic from UPnP-enabled or NAT-PMP-enabled applications to bypass
the firewall.
The no command has the firewall block all UPnP or NAT-PMP application
packets (for example, MSN packets).
link-sticking
outgoing interface
{interface_name |
all}
Specifies through which WAN interface(s) you want to send out traffic from
UPnP-enabled or NAT-PMP-enabled applications.
If the WAN interface you specified loses its connection, the Zyxel Device
attempts to use the other WAN interface. If the other WAN interface also does
not work, the Zyxel Device drops outgoing packets from UPnP-enabled or
NAT-PMP-enabled applications.
[no] listen-interface
interface_name
Enables UPnP and/or NAT-PMP on an internal interface.
The no command disables UPnP and/or NAT-PMP on the interface.
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