ZyXEL Communications MAX218M2W, User Manual

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Chapter 7 Network Setting
MAX208M2W Series User’s Guide
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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.
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.
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 received UPnP certification from the official UPnP Forum (http://
www.upnp.org). ZyXEL's UPnP implementation supports IGD 1.0 (Internet
Gateway Device).
The MAX208M2W Series only sends UPnP multicasts to the LAN.
Content Filter
Internet content filtering allows you to create and enforce Internet access policies
tailored to their needs. Content filtering is the ability to block certain specific URL
keywords.