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Page 96 / 421 Scroll up to view Page 91 - 95
Chapter 6 LAN Setup
P-660HN-FxZ Series User’s Guide
96
The following table describes the labels in this screen.
6.5
The IP Alias Screen
IP alias allows you to partition a physical network into different logical networks over the
same Ethernet interface. The ZyXEL Device supports three logical LAN interfaces via its
single physical Ethernet interface with the ZyXEL Device itself as the gateway for each LAN
network.
When you use IP alias, you can also configure firewall rules to control access between the
LAN's logical networks (subnets).
"
Make sure that the subnets of the logical networks do not overlap.
The following figure shows a LAN divided into subnets A, B, and C.
Table 26
Network > LAN > Client List
LABEL
DESCRIPTION
IP Address
Enter the IP address that you want to assign to the computer on your LAN with
the MAC address that you will also specify.
MAC Address
Enter the MAC address of a computer on your LAN.
Add
Click this to add a static DHCP entry.
#
This is the index number of the static IP table entry (row).
Status
This field displays whether the client is connected to the ZyXEL Device.
Host Name
This field displays the computer host name.
IP Address
This field displays the IP address relative to the # field listed above.
MAC Address
The MAC (Media Access Control) or Ethernet address on a LAN (Local Area
Network) is unique to your computer (six pairs of hexadecimal notation).
A network interface card such as an Ethernet adapter has a hardwired address
that is assigned at the factory. This address follows an industry standard that
ensures no other adapter has a similar address.
Reserve
Select the check box in the heading row to automatically select all check boxes or
select the check box(es) in each entry to have the ZyXEL Device always assign
the selected entry(ies)’s IP address(es) to the corresponding MAC address(es)
(and host name(s)). You can select up to 10 entries in this table.
Modify
Click the modify icon to have the IP address field editable and change it.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Refresh
Click this to reload the DHCP table.
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Figure 44
Physical Network & Partitioned Logical Networks
6.5.1
Configuring the LAN IP Alias Screen
Use this screen to change your ZyXEL Device’s IP alias settings. Click
Network
>
LAN
>
IP
Alias
to open the following screen.
Figure 45
Network > LAN > IP Alias
The following table describes the labels in this screen.
Ethernet
Interface
A: 192.168.1.1 - 192.168.1.24
B: 192.168.2.1 - 192.168.2.24
C: 192.168.3.1 - 192.168.3.24
Table 27
Network > LAN > IP Alias
LABEL
DESCRIPTION
IP Alias 1, 2
Select the check box to configure another LAN network for the ZyXEL Device.
IP Address
Enter the IP address of your ZyXEL Device in dotted decimal notation.
Alternatively, click the right mouse button to copy and/or paste the IP address.
IP Subnet Mask
Your ZyXEL Device will automatically calculate the subnet mask based on the IP
address that you assign. Unless you are implementing subnetting, use the subnet
mask computed by the ZyXEL Device.
Page 98 / 421
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98
6.6
LAN Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
6.6.1
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 46
LAN and WAN IP Addresses
RIP Direction
RIP (Routing Information Protocol, RFC 1058 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. Select the RIP direction from
Both/In
Only/Out Only/None
. When set to
Both
or
Out Only
, the ZyXEL Device 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.
RIP Version
The
RIP 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. 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
.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 27
Network > LAN > IP Alias
LABEL
DESCRIPTION
WAN
LAN
Page 99 / 421
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99
6.6.2
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.
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.
6.6.3
DNS Server Addresses
DNS (Domain Name System) maps 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. The DNS server addresses you enter when you
set up DHCP 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 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.
•
Some ISPs choose to disseminate the DNS server addresses using the DNS server
extensions of 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 the
DNS Server
fields in the
DHCP Setup
screen are set to
DNS Relay
, the ZyXEL
Device tells the DHCP clients that it itself is the DNS server. When a computer sends a
DNS query to the ZyXEL Device, the ZyXEL Device acts as a DNS proxy and 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 the 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.
6.6.4
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.
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.
Page 100 / 421
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100
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.
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.
"
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”.

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