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Page 106 / 427 Scroll up to view Page 101 - 105
P-2602H(W)(L)-DxA Series User’s Guide
106
Chapter 7 WAN Setup
Timeout
Type the number of seconds (3 recommended) for your ZyXEL Device to wait for a
ping response from one of the IP addresses in the
Check WAN IP Address
field
before timing out the request. The WAN connection is considered "down" after the
ZyXEL Device times out the number of times specified in the
Fail Tolerance
field.
Use a higher value in this field if your network is busy or congested.
Traffic Redirect
Traffic redirect forwards traffic to a backup gateway when the ZyXEL Device cannot
connect to the Internet.
Active Traffic
Redirect
Select this check box to have the ZyXEL Device use traffic redirect if the normal
WAN connection goes down.
Note:
If you activate traffic redirect, you must configure at least one
Check WAN IP Address.
Metric
This field sets this route's priority among the routes the ZyXEL Device uses.
The metric represents the "cost of transmission". A router determines the best route
for transmission by choosing a path with the lowest "cost". RIP routing uses hop
count as the measurement of cost, with a minimum of "1" for directly connected
networks. The number must be between "1" and "15"; a number greater than "15"
means the link is down. The smaller the number, the lower the "cost".
Backup Gateway
Type the IP address of your backup gateway in dotted decimal notation. The ZyXEL
Device automatically forwards traffic to this IP address if the ZyXEL Device's
Internet connection terminates.
Apply
Click
Apply
to save the changes.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 29
WAN Backup Setup (continued)
LABEL
DESCRIPTION
Page 107 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 8 LAN Setup
107
C
HAPTER
8
LAN Setup
This chapter describes how to configure LAN settings.
8.1
LAN Overview
A Local Area Network (LAN) is a shared communication system to which many computers
are attached. A LAN is a computer network limited to the immediate area, usually the same
building or floor of a building. The LAN screens can help you configure a LAN DHCP server
and manage IP addresses.
See
Section 8.3 on page 113
to configure the
LAN
screens.
8.1.1
LANs, WANs and the ZyXEL Device
The actual physical connection determines whether the ZyXEL Device ports are LAN or
WAN ports. There are two separate IP networks, one inside the LAN network and the other
outside the WAN network as shown next.
Figure 53
LAN and WAN IP Addresses
Page 108 / 427
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Chapter 8 LAN Setup
8.1.2
DHCP Setup
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual
clients to obtain TCP/IP configuration at start-up from a server. You can configure the ZyXEL
Device as a DHCP server or disable it. When configured as a server, the ZyXEL Device
provides the TCP/IP configuration for the clients. If you turn DHCP service off, you must
have another DHCP server on your LAN, or else the computer must be manually configured.
8.1.2.1
IP Pool Setup
The ZyXEL Device is pre-configured with a pool of IP addresses for the DHCP clients (DHCP
Pool). See the product specifications in the appendices. Do not assign static IP addresses from
the DHCP pool to your LAN computers.
8.1.3
DNS Server Address
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 machine before you can access it. The DNS server addresses that you enter in
the DHCP setup are passed to the client machines along with the assigned IP address and
subnet mask.
There are two ways that an ISP disseminates the DNS server addresses.
The first is for an ISP
to tell a customer the DNS server addresses, usually in the form of an information sheet, when
s/he signs up.
If your ISP gives you the DNS server addresses, enter them in the
DNS Server
fields in
DHCP Setup
, otherwise, leave them blank.
Some ISP’s choose to pass the DNS servers using the DNS server extensions of PPP IPCP (IP
Control Protocol) after the connection is up.
If your ISP did not give you explicit DNS
servers, chances are the DNS servers are conveyed through IPCP negotiation.
The ZyXEL
Device supports the IPCP DNS server extensions through the DNS proxy feature.
If you set the router to be a DNS relay, it tells the DHCP clients that the device itself is the
DNS server. When a computer sends a DNS query to the ZyXEL Device, the ZyXEL Device
forwards the query to the real DNS server learned through IPCP and relays the response back
to the computer.
Please note that DNS proxy works only when the ISP uses IPCP DNS server extensions. It
does not mean you can leave the DNS servers out of the DHCP setup under all circumstances.
If your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the
DHCP Setup
screen. This way, the ZyXEL Device can pass the DNS servers to the computers
and the computers can query the DNS server directly without the ZyXEL Device’s
intervention.
Page 109 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 8 LAN Setup
109
8.1.4
DNS Server Address Assignment
Use DNS (Domain Name System) to map 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.
There are two ways that an ISP disseminates the DNS server addresses.
•
The ISP tells you the DNS server addresses, usually in the form of an information sheet,
when you sign up. If your ISP gives you DNS server addresses, enter them in the DNS
Server fields in the
DHCP Setup
screen.
•
The ZyXEL Device acts as a DNS proxy when the
DNS Server
field is set to
DNS Relay
in the
DHCP Setup
screen.
8.2
LAN TCP/IP
The ZyXEL Device has built-in DHCP server capability that assigns IP addresses and DNS
servers to systems that support DHCP client capability.
8.2.1
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a
LAN share one common network number.
Where you obtain your network number depends on your particular situation. If the ISP or
your network administrator assigns you a block of registered IP addresses, follow their
instructions in selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single
user account and the ISP will assign you a dynamic IP address when the connection is
established. If this is the case, it is recommended that you select a network number from
192.168.0.0 to 192.168.255.0 and you must enable the Network Address Translation (NAT)
feature of the ZyXEL Device. The Internet Assigned Number Authority (IANA) reserved this
block of addresses specifically for private use; please do not use any other number unless you
are told otherwise. Let's say you select 192.168.1.0 as the network number; which covers 254
individual addresses, from 192.168.1.1 to 192.168.1.254 (zero and 255 are reserved). In other
words, the first three numbers specify the network number while the last number identifies an
individual computer on that network.
Once you have decided on the network number, pick an IP address that is easy to remember,
for instance, 192.168.1.1, for your ZyXEL Device, but make sure that no other device on your
network is using that IP address.
The subnet mask specifies the network number portion of an IP address. Your ZyXEL Device
will compute the subnet mask automatically based on the IP address that you entered. You
don't need to change the subnet mask computed by the ZyXEL Device unless you are
instructed to do otherwise.
Page 110 / 427
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Chapter 8 LAN Setup
8.2.1.1
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from
the Internet, for example, only between your two branch offices, you can assign any IP
addresses to the hosts without problems. However, the Internet Assigned Numbers Authority
(IANA) has reserved the following three blocks of IP addresses specifically for private
networks:
• 10.0.0.0
— 10.255.255.255
• 172.16.0.0
— 172.31.255.255
•
192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or it can be assigned from a
private network. If you belong to a small organization and your Internet access is through an
ISP, the ISP can provide you with the Internet addresses for your local networks. On the other
hand, if you are part of a much larger organization, you should consult your network
administrator for the appropriate IP addresses.
Note:
Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address
assignment, please refer to RFC 1597,
Address Allocation for Private Internets
and RFC 1466,
Guidelines for Management of IP Address Space.
8.2.2
RIP Setup
RIP (Routing Information Protocol) allows a router to exchange routing information with
other routers.
The
RIP Direction
field controls the sending and receiving of RIP packets.
When set to:
•
Both
-
the ZyXEL Device will broadcast its routing table periodically and incorporate
the RIP information that it receives.
•
In Only
-
the ZyXEL Device will not send any RIP packets but will accept all RIP
packets received.
•
Out Only
-
the ZyXEL Device will send out RIP packets but will not accept any RIP
packets received.
•
None
-
the ZyXEL Device will not send any RIP packets and will ignore any RIP
packets received.
The
Version
field controls the format and the broadcasting method of the RIP packets that the
ZyXEL Device sends (it recognizes both formats when receiving).
RIP-1
is universally
supported; but RIP-2 carries more information.
RIP-1 is probably adequate for most
networks, unless you have an unusual network topology.
Both
RIP-2B
and
RIP-2M
sends the routing data in RIP-2 format; the difference being that
RIP-2B
uses subnet broadcasting while
RIP-2M
uses multicasting.

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