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Page 106 / 412 Scroll up to view Page 101 - 105
Chapter 6 Wireless
VMG8924-B10A and VMG8924-B30A Series User’s Guide
106
•
When you use the PBC method, there is a short period (from the moment you press the button
on one device to the moment you press the button on the other device) when any WPS-enabled
device could join the network. This is because the registrar has no way of identifying the
“correct” enrollee, and cannot differentiate between your enrollee and a rogue device. This is a
possible way for a hacker to gain access to a network.
You can easily check to see if this has happened. WPS works between only two devices
simultaneously, so if another device has enrolled your device will be unable to enroll, and will not
have access to the network. If this happens, open the access point’s configuration interface and
look at the list of associated clients (usually displayed by MAC address). It does not matter if the
access point is the WPS registrar, the enrollee, or was not involved in the WPS handshake; a
rogue device must still associate with the access point to gain access to the network. Check the
MAC addresses of your wireless clients (usually printed on a label on the bottom of the device). If
there is an unknown MAC address you can remove it or reset the AP.
Page 107 / 412
VMG8924-B10A and VMG8924-B30A Series User’s Guide
107
C
HAPTER
7
Home Networking
7.1
Overview
A Local Area Network (LAN) is a shared communication system to which many networking devices
are connected. It is usually located in one immediate area such as a building or floor of a building.
Use the LAN screens to help you configure a LAN DHCP server and manage IP addresses.
7.1.1
What You Can Do in this Chapter
•
Use the
LAN Setup
screen to set the LAN IP address, subnet mask, and DHCP settings of your
Device (
Section 7.2 on page 109
).
•
Use the
Static DHCP
screen to assign IP addresses on the LAN to specific individual computers
based on their MAC Addresses (
Section 7.3 on page 113
).
•
Use the
UPnP
screen to enable UPnP and UPnP NAT traversal on the Device (
Section 7.4 on page
114
).
•
Use the
Additional Subnet
screen to configure IP alias and public static IP (
Section 7.7 on page
124
).
•
Use the
STB Vendor ID
screen to have the Device automatically create static DHCP entries for
Set Top Box (STB) devices when they request IP addresses (
Section 7.8 on page 125
)
•
Use the
5th Ethernet Port
screen to configure the
WAN
port as the Ethernet WAN port or a LAN
port (
Section 7.9 on page 125
).
•
Use the
LAN VLAN
screen to control the VLAN ID and IEEE 802.1p priority tags of traffic sent out
through individual LAN ports (
Section 7.10 on page 126
).
•
Use the
Wake on Lan
screen to remotely turn on a device on the network. (
Section 7.11 on
page 127
).
DSL
LAN
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Chapter 7 Home Networking
VMG8924-B10A and VMG8924-B30A Series User’s Guide
108
7.1.2
What You Need To Know
7.1.2.1
About LAN
IP Address
IP addresses identify individual devices on a network. Every networking device (including
computers, servers, routers, printers, etc.) needs an IP address to communicate across the
network. These networking devices are also known as hosts.
Subnet Mask
Subnet masks determine the maximum number of possible hosts on a network. You can also use
subnet masks to divide one network into multiple sub-networks.
DHCP
A DHCP (Dynamic Host Configuration Protocol) server can assign your Device an IP address, subnet
mask, DNS and other routing information when it's turned on.
DNS
DNS (Domain Name System) is for mapping 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 networking device before you can access it.
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.
7.1.2.2
About UPnP
Identifying UPnP Devices
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.
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
Page 109 / 412
Chapter 7 Home Networking
VMG8924-B10A and VMG8924-B30A Series User’s Guide
109
•
Assigning lease times to mappings
Windows Messenger is an example of an application that supports NAT traversal and UPnP.
See the
Chapter 10 on page 157
for more information on NAT.
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 Device allows multicast messages on the LAN only.
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 achieved UPnP certification from the Universal Plug and Play Forum UPnP™
Implementers Corp. (UIC). ZyXEL's UPnP implementation supports Internet Gateway Device (IGD)
1.0.
See
Section 7.5 on page 115
for examples of installing and using UPnP.
Finding Out More
See
Section 7.12 on page 128
for technical background information on LANs.
7.1.3
Before You Begin
Find out the MAC addresses of your network devices if you intend to add them to the DHCP Client
List screen.
7.2
The LAN Setup Screen
Use this screen to set the Local Area Network IP address and subnet mask of your Device. Click
Network Setting > Home Networking
to open the
LAN Setup
screen.
Follow these steps to configure your LAN settings.
1
Enter an IP address into the
IP Address
field. The IP address must be in dotted decimal notation.
This will become the IP address of your Device.
2
Enter the IP subnet mask into the
IP Subnet Mask
field. Unless instructed otherwise it is best to
leave this alone, the configurator will automatically compute a subnet mask based upon the IP
address you entered.
Page 110 / 412
Chapter 7 Home Networking
VMG8924-B10A and VMG8924-B30A Series User’s Guide
110
3
Click
Apply
to save your settings.
Figure 55
Network Setting > Home Networking > LAN Setup
The following table describes the fields in this screen.
Table 30
Network Setting > Home Networking > LAN Setup
LABEL
DESCRIPTION
Interface Group
Group Name
Select the interface group name for which you want to configure LAN settings. See
Chapter
12 on page 179
for how to create a new interface group.
LAN IP Setup
IPv4 Address
Enter the LAN IPv4 IP address you want to assign to your Device in dotted decimal notation,
for example, 192.168.1.1 (factory default).
Subnet Mask/
Prefix Length
Type the subnet mask of your network in dotted decimal notation, for example
255.255.255.0 (factory default). Your Device automatically computes the subnet mask
based on the IP Address you enter, so do not change this field unless you are instructed to
do so.
IGMP Snooping
Status
Select the
Enable IGMP Snooping
checkbox to allows the Device to passively learn
multicast group.
IGMP Mode
Select
Standard Mode
to have the Device forward multicast packets to a port that joins the
multicast group and broadcast unknown multicast packets from the WAN to all LAN ports.
Select
Blocking Mode
to have the Device block all unknown multicast packets from the
WAN.
DHCP Server State
DHCP
Select
Enable
to have the Device act as a DHCP server or DHCP relay agent.
Select
Disable
to stop the DHCP server on the Device.
Select
DHCP Relay
to have the Device forward DHCP request to the DHCP server.
DHCP Relay
Server Address
This field is only available when you select
DHCP Relay
in the
DHCP
field.

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