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Chapter 8 Home Networking
VMG1312-B Series User’s Guide
126
8.1.2
What You Need To Know
8.1.2.1
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.
8.1.2.2
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
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Chapter 8 Home Networking
VMG1312-B Series User’s Guide
127
•
Assigning lease times to mappings
Windows Messenger is an example of an application that supports NAT traversal and UPnP.
See the
Chapter 11 on page 165
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 8.4.1 on page 133
for examples of installing and using UPnP.
Finding Out More
See
Section 8.8 on page 138
for technical background information on LANs.
8.1.3
Before You Begin
Find out the MAC addresses of your network devices if you intend to add them to the DHCP Client
List screen.
8.2
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.
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Chapter 8 Home Networking
VMG1312-B Series User’s Guide
128
3
Click
Apply
to save your settings.
Figure 52
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
15 on page 191
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.
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Chapter 8 Home Networking
VMG1312-B Series User’s Guide
129
DHCP Relay
Server Address
This field is only available when you select
DHCP Relay
in the
DHCP
field.
IPv4 Address
Enter the IPv4 IP address of the actual remote DHCP server in this field.
IP Addressing
Values
This field is only available when you select
Enable
in the
DHCP
field.
Beginning IP
Address
This field specifies the first of the contiguous addresses in the IP address pool.
Ending IP
Address
This field specifies the last of the contiguous addresses in the IP address pool.
Auto reserve IP
for the same
host
Select
Enable
to have the Device record DHCP IP addresses with the MAC addresses the IP
addresses are assigned to. The Device assigns the same IP address to the same MAC
address when the host requests an IP address again through DHCP.
DHCP Server
Lease Time
This is the period of time DHCP-assigned addresses is used. DHCP automatically assigns IP
addresses to clients when they log in. DHCP centralizes IP address management on central
computers that run the DHCP server program. DHCP leases addresses, for a period of time,
which means that past addresses are “recycled” and made available for future reassignment
to other systems.
This field is only available when you select
Enable
in the
DHCP
field.
Days/Hours/
Minutes
Enter the lease time of the DHCP server.
DNS Values
This field is only available when you select
Enable
in the
DHCP
field.
DNS
Select the type of service that you are registered for from your Dynamic DNS service
provider.
Select
Dynamic
if you have the Dynamic DNS service.
Select
Static
if you have the Static DNS service.
DNS Server 1
DNS Server 2
Enter the first and second DNS (Domain Name System) server IP address the Device passes
to the DHCP clients.
LAN IPv6 Mode Setup
IPv6 State
Select
Enable
to activate the IPv6 mode and configure IPv6 settings on the Device.
LAN IPv6 Address Setup
Delegate prefix
from WAN
Select this option to automatically obtain an IPv6 network prefix from the service provider
or an uplink router.
Static
Select this option to configure a fixed IPv6 address for the Device’s LAN IPv6 address.
ULA Pseudo-
Random Global
ID
A unique local address (ULA) is a unique IPv6 address for use in private networks but not
routable in the global IPv6 Internet.
Select this to have the Device automatically generate a globally unique address for the LAN
IPv6 address. The address format is like fdxx:xxxx:xxxx:xxxx::/64.
ULA IPv6 Address Setup
IPv6 Address
If you select static IPv6 address, enter the IPv6 address prefix that the Device uses for the
LAN IPv6 address.
Prefix Length
If you select static IPv6 address, enter the IPv6 prefix length that the Device uses to
generate the LAN IPv6 address.
An IPv6 prefix length specifies how many most significant bits (starting from the left) in the
address compose the network address. This field displays the bit number of the IPv6 subnet
mask.
Table 30
Network Setting > Home Networking > LAN Setup (continued)
LABEL
DESCRIPTION
Page 130 / 331
Chapter 8 Home Networking
VMG1312-B Series User’s Guide
130
MLD Snooping
Multicast Listener Discovery (MLD) allows an IPv6 switch or router to discover the presence
of MLD hosts who wish to receive multicast packets and the IP addresses of multicast
groups the hosts want to join on its network. Select
Enable MLD Snooping
to activate MLD
Snooping on the Device. This allows the Device to check MLD packets passing through it and
learn the multicast group membership. It helps reduce multicast traffic.
MLD Mode
Select
Standard Mode
to have the Device forward IPv6 multicast packets to a port that
joins the IPv6 multicast group and broadcast unknown IPv6 multicast packets from the WAN
to all LAN ports.
Select
Blocking Mode
to have the Device block all unknown IPv6 multicast packets from
the WAN.
LAN IPv6
Address Assign
Setup
Select how you want to obtain an IPv6 address:
•
Stateless
: The Device uses IPv6 stateless autoconfiguration. RADVD (Router
Advertisement Daemon) is enabled to have the Device send IPv6 prefix information in
router advertisements periodically and in response to router solicitations. DHCPv6 server
is disabled.
•
Stateful
: The Device uses IPv6 stateful autoconfiguration. The DHCPv6 server is
enabled to have the Device act as a DHCPv6 server and pass IPv6 addresses to DHCPv6
clients.
•
Stateless and Stateful
: The Device uses both IPv6 stateless and stateful
autoconfiguration. The LAN IPv6 clients can obtain IPv6 addresses either through router
advertisements or through DHCPv6.
LAN IPv6 DNS
Assign Setup
Select how the Device provide DNS server and domain name information to the clients:
•
From Router Advertisement
: The Device provides DNS information through router
advertisements.
•
From DHCPv6 Server
: The Device provides DNS information through DHCPv6.
•
From RA & DHCPv6 Server
: The Device provides DNS information through both router
advertisements and DHCPv6.
DHCPv6 Configuration
DHCPv6 State
This shows the status of the DHCPv6.
IPv6 Router Advertisement State
RADVD State
This shows whether RADVD is enabled or not.
IPv6 DNS Values
IPv6 DNS
Server 1-3
Select
From ISP
if your ISP dynamically assigns IPv6 DNS server information.
Select
User-Defined
if you have the IPv6 address of a DNS server. Enter the DNS server
IPv6 addresses the Device passes to the DHCP clients.
Select
None
if you do not want to configure IPv6 DNS servers.
DNS Query
Scenario
Select how the Device handles clients’ DNS information requests.
•
IPv4/IPv6 DNS Server
: The Device forwards the requests to both the IPv4 and IPv6
DNS servers and sends clients the first DNS information it receives.
•
IPv6 DNS Server Only
: The Device forwards the requests to the IPv6 DNS server and
sends clients the DNS information it receives.
•
IPv4 DNS Server Only
: The Device forwards the requests to the IPv4 DNS server and
sends clients the DNS information it receives.
•
IPv6 DNS Server First
: The Device forwards the requests to the IPv6 DNS server first
and then the IPv4 DNS server. Then it sends clients the first DNS information it receives.
•
IPv4 DNS Server First
: The Device forwards the requests to the IPv4 DNS server first
and then the IPv6 DNS server. Then it sends clients the first DNS information it receives.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 30
Network Setting > Home Networking > LAN Setup (continued)
LABEL
DESCRIPTION

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