ZyXEL Communications Nebula LTE3301-PLUS User Manual page 163

Chapter 9 Home Networking
DHCP
DHCP (Dynamic Host Configuration Protocol) allows clients to obtain TCP/IP configuration at start-up
from a server. This Zyxel Device has a built-in DHCP server capability that assigns IP addresses and DNS
servers to systems that support DHCP client capability.
DNS
DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa. The
DNS server is extremely important because without it, you must know the IP address of a computer
before you can access it. The DNS server addresses you enter when you set up DHCP are passed to the
client machines along with the assigned IP address and subnet mask.
RADVD (Router Advertisement Daemon)
When an IPv6 host sends a Router Solicitation (RS) request to discover the available routers, RADVD with
Router Advertisement (RA) messages in response to the request. It specifies the minimum and maximum
intervals of RA broadcasts. RA messages containing the address prefix. IPv6 hosts can be generated
with the IPv6 prefix an IPv6 address.
9.1.2.2 About UPnP
How do I know if I am using UPnP?
UPnP hardware is identified as an icon in the Network Connections folder (Windows 7). 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.
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.
Nebula Mobile Router User's Guide
163