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Page 86 / 421 Scroll up to view Page 81 - 85
Chapter 5 WAN Setup
P-660HN-FxZ Series User’s Guide
86
5.7.1
ATM Traffic Classes
These are the basic ATM traffic classes defined by the ATM Forum Traffic Management 4.0
Specification.
Constant Bit Rate (CBR)
Constant Bit Rate (CBR) provides fixed bandwidth that is always available even if no data is
being sent. CBR traffic is generally time-sensitive (doesn't tolerate delay). CBR is used for
connections that continuously require a specific amount of bandwidth. A PCR is specified and
if traffic exceeds this rate, cells may be dropped. Examples of connections that need CBR
would be high-resolution video and voice.
Variable Bit Rate (VBR)
The Variable Bit Rate (VBR) ATM traffic class is used with bursty connections. Connections
that use the Variable Bit Rate (VBR) traffic class can be grouped into real time (VBR-RT) or
non-real time (VBR-nRT) connections.
The VBR-RT (real-time Variable Bit Rate) type is used with bursty connections that require
closely controlled delay and delay variation. It also provides a fixed amount of bandwidth (a
PCR is specified) but is only available when data is being sent. An example of an VBR-RT
connection would be video conferencing. Video conferencing requires real-time data transfers
and the bandwidth requirement varies in proportion to the video image's changing dynamics.
The VBR-nRT (non real-time Variable Bit Rate) type is used with bursty connections that do
not require closely controlled delay and delay variation. It is commonly used for "bursty"
traffic typical on LANs. PCR and MBS define the burst levels, SCR defines the minimum
level. An example of an VBR-nRT connection would be non-time sensitive data file transfers.
Unspecified Bit Rate (UBR)
The Unspecified Bit Rate (UBR) ATM traffic class is for bursty data transfers. However, UBR
doesn't guarantee any bandwidth and only delivers traffic when the network has spare
bandwidth. An example application is background file transfer.
5.8
Traffic Redirect
Traffic redirect forwards traffic to a backup gateway when the ZyXEL Device cannot connect
to the Internet. An example is shown in the figure below.
Page 87 / 421
Chapter 5 WAN Setup
P-660HN-FxZ Series User’s Guide
87
Figure 38
Traffic Redirect Example
The following network topology allows you to avoid triangle route security issues when the
backup gateway is connected to the LAN. Use IP alias to configure the LAN into two or three
logical networks with the ZyXEL Device itself as the gateway for each LAN network. Put the
protected LAN in one subnet (Subnet 1 in the following figure) and the backup gateway in
another subnet (Subnet 2). Configure filters that allow packets from the protected LAN
(Subnet 1) to the backup gateway (Subnet 2).
Figure 39
Traffic Redirect LAN Setup
WAN
LAN
Backup Gateway
WAN
LAN
Backup Gateway
Subnet 2
192.168.2.0 - 192.168.2.24
Subnet 1
192.168.1.0 - 192.168.1.24
Page 88 / 421
Chapter 5 WAN Setup
P-660HN-FxZ Series User’s Guide
88
Page 89 / 421
P-660HN-FxZ Series User’s Guide
89
C
HAPTER
6
LAN Setup
6.1
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.
6.1.1
What You Can Do in the LAN Screens
•
Use the
LAN IP
screen (
Section 6.2 on page 90
) to set the LAN IP address and subnet
mask of your ZyXEL device. You can also edit your ZyXEL Device's RIP, multicast, any
IP and Windows Networking settings from this screen.
•
Use the
DHCP Setup
screen (
Section 6.3 on page 93
) to configure the ZyXEL Device’s
DHCP settings.
•
Use the
Client List
screen (
Section 6.4 on page 95
) to assign IP addresses on the LAN to
specific individual computers based on their MAC Addresses.
•
Use the
IP Alias
screen (
Section 6.5 on page 96
) to change your ZyXEL Device’s IP alias
settings.
6.1.2
What You Need To Know 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.
DSL
LAN
Page 90 / 421
Chapter 6 LAN Setup
P-660HN-FxZ Series User’s Guide
90
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 ZyXEL Device an IP
address, subnet mask, DNS and other routing information when it's turned on.
RIP
RIP (Routing Information Protocol) allows a router to exchange routing information with
other routers.
Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1
recipient) or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to
a group of hosts on the network - not everybody and not just 1.
IGMP
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish
membership in a Multicast group - it is not used to carry user data. There are three versions of
IGMP. IGMP version 2 is an improvement over version 1, but IGMP version 1 is still in wide
use. IGMP version 3 supports source filtering, reporting or ignoring traffic from specific
source address to a particular host on the network.
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.
Finding Out More
See
Section 6.6 on page 98
for technical background information on LANs.
6.1.3
Before You Begin
Find out the MAC addresses of your network devices if you intend to add them to the DHCP
Client List screen.
6.2
The LAN IP Screen
Use this screen to set the Local Area Network IP address and subnet mask of your ZyXEL
Device. Click
Network > LAN
to open the
IP
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 ZyXEL Device.

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