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Page 81 / 285 Scroll up to view Page 76 - 80
Prestige 324 Intelligent Broadband Sharing Gateway
7-2
LAN Setup
Figure 7-2 Menu 3.1 — LAN Port Filter Setup
Menu 3.2 is discussed in the next part of the manual. Please read on.
7.2
TCP/IP and DHCP for LAN
The Prestige has built-in DHCP server capability that assigns IP addresses and DNS servers to systems that
support DHCP client capability.
7.2.1 Factory LAN Defaults
The LAN parameters of the Prestige are preset in the factory with the following values:
1.
IP address of 192.168.1.1 with subnet mask of 255.255.255.0 (24 bits)
2.
DHCP server enabled with 32 client IP addresses starting from 192.168.1.33.
These parameters should work for the majority of installations. If your ISP gives you explicit DNS server
address(es), skip to the
DNS Server Address section
to see how to enter the DNS server address(es).
7.2.2 DHCP Configuration
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 Prestige as a DHCP server or
disable it. When configured as a server, the Prestige provides the TCP/IP configuration for the clients. If set
to
None
, DHCP service will be disabled and you must have another DHCP server on your LAN, or else
the workstation must be manually configured.
Menu 3.1 – LAN Port Filter Setup
Input Filter Sets:
protocol filters=
device filters=
Output Filter Sets:
protocol filters=
device filters=
Press ENTER to Confirm or ESC to Cancel:
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Prestige 324 Intelligent Broadband Sharing Gateway
LAN Setup
7-3
IP Pool Setup
The Prestige is pre-configured with a pool of 32 IP addresses starting from 192.168.1.33 to 192.168.1.64.
This configuration leaves 31 IP addresses (excluding the Prestige itself) in the lower range for other server
computers, e.g., server for mail, FTP, telnet, web, etc., that you may have.
DNS Server Address
The DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa,
e.g., the IP address of
www.zyxel.com
is 204.217.0.2. 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.
1.
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 DHCP Setup
.
2.
Leave the
DNS Server
fields in DHCP Setup blank (for example 0.0.0.0). The Prestige acts as a DNS
proxy when this field is blank.
Table 7-1 Example of Network Properties for LAN Servers with Fixed IP Addresses
Choose an IP address
192.168.1.2 - 192.168.1.32; 192.168.1.65 - 192.168.1.254.
Subnet mask
255.255.255.0
Gateway (or default route)
192.168.1.1 (Prestige LAN IP)
7.2.3 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
Page 83 / 285
Prestige 324 Intelligent Broadband Sharing Gateway
7-4
LAN Setup
enable the Network Address Translation (NAT) feature of the Prestige. 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
workstation on that network.
Once you have decided on the network number, pick an IP address that is easy to remember, e.g.,
192.168.1.1, for your Prestige, but make sure that no other device on your network is using that IP.
The subnet mask specifies the network number portion of an IP address. Your Prestige 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 Prestige unless you are instructed to do otherwise.
7.2.4 Private IP Addresses
Every computer on the Internet must have a unique IP address. If your networks are isolated from the
Internet, e.g., 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:
Table 7-2 Private IP Address Ranges
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 have it assigned by 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.
Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address
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Prestige 324 Intelligent Broadband Sharing Gateway
LAN Setup
7-5
assignment, please refer to
RFC 1597,
Address Allocation for Private Internets
and
RFC 1466,
Guidelines for Management of IP Address Space.
7.2.5 RIP Setup
RIP (Routing Information Protocol, RFC1058 and RFC 1389) 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
or
Out Only
,
the Prestige will broadcast its routing table periodically. When set to
Both
or
In Only
, it will incorporate the RIP information that it receives; when set to
None
, it 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 Prestige
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. Multicasting can reduce the load on non-router
machines since they generally do not listen to the RIP multicast address and so will not receive the RIP
packets. However, if one router uses multicasting, then all routers on your network must use multicasting,
also.
By default,
RIP Direction
is set to
Both
and the
Version
set to
RIP-1
.
7.2.6 IP 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 (Internet Group Multicast Protocol) is a session-layer protocol used to establish membership in a
Multicast group - it is not used to carry user data. IGMP version 2 (RFC 2236) is an improvement over
version 1 (RFC 1112) but IGMP version 1 is still in wide use. If you would like to read more detailed
information about interoperability between IGMP version 2 and version 1, please see
sections 4 and 5 of
RFC 2236
. The class D IP address is used to identify host groups and can be in the range 224.0.0.0 to
239.255.255.255. The address 224.0.0.0 is not assigned to any group and is used by IP multicast computers.
Page 85 / 285
Prestige 324 Intelligent Broadband Sharing Gateway
7-6
LAN Setup
The address 224.0.0.1 is used for query messages and is assigned to the permanent group of all IP hosts
(including gateways). All hosts must join the 224.0.0.1 group in order to participate in IGMP. The address
224.0.0.2 is assigned to the multicast routers group.
The Prestige supports both IGMP version 1 (
IGMP-v1
) and IGMP version 2 (
IGMP-v2
)
. At start up, the
Prestige queries all directly connected networks to gather group membership. After that, the Prestige
periodically updates this information. IP Multicasting can be enabled/disabled on the Prestige LAN and/or
WAN interfaces using menus 3.2 (LAN) and 11.3 (WAN). Select
None
to disable IP Multicasting on these
interfaces.
7.2.7 IP Alias
IP Alias allows you to partition a physical network into different logical networks over the same Ethernet
interface. The Prestige supports three logical LAN interfaces via its single physical Ethernet interface with
the Prestige itself as the gateway for each LAN network.
Figure 7-3 Physical Network
Figure 7-4 Partitioned Logical Networks
Use menu 3.2.1 to configure IP Alias on your Prestige.
7.3
TCP/IP and DHCP Ethernet Setup
From the main menu, enter 3
to open
Menu 3 - LAN Setup
(10/100 Mbps Ethernet)
to configure TCP/IP
(RFC 1155) and DHCP Ethernet setup.

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