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Page 66 / 268 Scroll up to view Page 61 - 65
Chapter 5 LAN Setup
P-660R-F1 Series User’s Guide
66
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.
5.2.2
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.
5.2.3
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 network-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. 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 ZyXEL Device supports both IGMP version 1 (
IGMP-v1
) and IGMP version 2 (
IGMP-v2
). At
start up, the ZyXEL Device queries all directly connected networks to gather group membership.
After that, the ZyXEL Device periodically updates this information. IP multicasting can be enabled/
disabled on the ZyXEL Device LAN and/or WAN interfaces in the web configurator (
LAN
;
WAN
).
Select
None
to disable IP multicasting on these interfaces.
Page 67 / 268
Chapter 5 LAN Setup
P-660R-F1 Series User’s Guide
67
5.2.4
Any IP
Traditionally, you must set the IP addresses and the subnet masks of a computer and the ZyXEL
Device to be in the same subnet to allow the computer to access the Internet (through the ZyXEL
Device). In cases where your computer is required to use a static IP address in another network,
you may need to manually configure the network settings of the computer every time you want to
access the Internet via the ZyXEL Device.
With the Any IP feature and NAT enabled, the ZyXEL Device allows a computer to access the
Internet without changing the network settings (such as IP address and subnet mask) of the
computer, when the IP addresses of the computer and the ZyXEL Device are not in the same
subnet. Whether a computer is set to use a dynamic or static (fixed) IP address, you can simply
connect the computer to the ZyXEL Device and access the Internet.
The following figure depicts a scenario where a computer is set to use a static private IP address in
the corporate environment. In a residential house where a ZyXEL Device is installed, you can still
use the computer to access the Internet without changing the network settings, even when the IP
addresses of the computer and the ZyXEL Device are not in the same subnet.
Figure 33
Any IP Example
The Any IP feature does not apply to a computer using either a dynamic IP address or a static IP
address that is in the same subnet as the ZyXEL Device’s IP address.
Note: You
must
enable NAT/SUA to use the Any IP feature on the ZyXEL Device.
5.2.4.1
How Any IP Works
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP
address) to a physical machine address, also known as a Media Access Control or MAC address, on
the local area network. IP routing table is defined on IP Ethernet devices (the ZyXEL Device) to
decide which hop to use, to help forward data along to its specified destination.
The following lists out the steps taken, when a computer tries to access the Internet for the first
time through the ZyXEL Device.
Page 68 / 268
Chapter 5 LAN Setup
P-660R-F1 Series User’s Guide
68
1
When a computer (which is in a different subnet) first attempts to access the Internet, it sends
packets to its default gateway (which is not the ZyXEL Device) by looking at the MAC address in its
ARP table.
2
When the computer cannot locate the default gateway, an ARP request is broadcast on the LAN.
3
The ZyXEL Device receives the ARP request and replies to the computer with its own MAC address.
4
The computer updates the MAC address for the default gateway to the ARP table. Once the ARP
table is updated, the computer is able to access the Internet through the ZyXEL Device.
5
When the ZyXEL Device receives packets from the computer, it creates an entry in the IP routing
table so it can properly forward packets intended for the computer.
After all the routing information is updated, the computer can access the ZyXEL Device and the
Internet as if it is in the same subnet as the ZyXEL Device.
5.3
Configuring LAN IP
Click
LAN
to open the
IP
screen. See
Section 5.1 on page 63
for background information.
Figure 34
LAN IP
The following table describes the fields in this screen.
Table 18
LAN IP
LABEL
DESCRIPTION
TCP/IP
IP Address
Enter the IP address of your ZyXEL Device in dotted decimal notation, for
example, 192.168.1.1 (factory default).
IP Subnet Mask
Type the subnet mask assigned to you by your ISP (if given).
Apply
Click
Apply
to save your changes back to the ZyXEL Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Advanced Setup
Click this button to display the
Advanced LAN Setup
screen and edit more
details of your LAN setup.
Page 69 / 268
Chapter 5 LAN Setup
P-660R-F1 Series User’s Guide
69
5.3.1
Configuring Advanced LAN Setup
To edit your ZyXEL Device's advanced LAN settings, click the
Advanced Setup
button in the
LAN
IP
screen. The screen appears as shown.
Figure 35
Advanced LAN Setup
The following table describes the labels in this screen.
Table 19
Advanced LAN Setup
LABEL
DESCRIPTION
RIP & Multicast
Setup
RIP Direction
Select the RIP direction from
None
,
Both
,
In Only
and
Out Only
.
RIP Version
Select the RIP version from
RIP-1
,
RIP-2B
and
RIP-2M
.
Multicast
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to
establish membership in a multicast group. The ZyXEL Device supports both IGMP
version 1 (
IGMP-v1
) and
IGMP-v2
. Select
None
to disable it.
Any IP Setup
Select the
Active
check box to enable the Any IP feature. This allows a computer
to access the Internet without changing the network settings (such as IP address
and subnet mask) of the computer, even when the IP addresses of the computer
and the ZyXEL Device are not in the same subnet.
When you disable the Any IP feature, only computers with dynamic IP addresses
or static IP addresses in the same subnet as the ZyXEL Device’s LAN IP address
can connect to the ZyXEL Device or access the Internet through the ZyXEL Device.
Windows
Networking
(NetBIOS over
TCP/IP)
NetBIOS (Network Basic Input/Output System) are TCP or UDP packets that
enable a computer to connect to and communicate with a LAN. For some dial-up
services such as PPPoE or PPTP, NetBIOS packets cause unwanted calls. However
it may sometimes be necessary to allow NetBIOS packets to pass through to the
WAN in order to find a computer on the WAN.
Allow between
LAN and WAN
Select this check box to forward NetBIOS packets from the LAN to the WAN and
from the WAN to the LAN. If your firewall is enabled with the default policy set to
block WAN to LAN traffic, you also need to enable the default WAN to LAN firewall
rule that forwards NetBIOS traffic.
Clear this check box to block all NetBIOS packets going from the LAN to the WAN
and from the WAN to the LAN.
Page 70 / 268
Chapter 5 LAN Setup
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70
5.4
DHCP Setup
Use this screen to configure the DNS server information that the ZyXEL Device sends to the DHCP
client devices on the LAN.
Figure 36
DHCP Setup
The following table describes the labels in this screen.
Back
Click
Back
to return to the previous screen.
Apply
Click
Apply
to save the changes.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 19
Advanced LAN Setup (continued)
LABEL
DESCRIPTION
Table 20
DHCP Setup
LABEL
DESCRIPTION
DHCP Setup
DHCP
If set to
Server
, your ZyXEL Device can assign IP addresses, an IP default
gateway and DNS servers to Windows 95, Windows NT and other systems that
support the DHCP client.
If set to
None
, the DHCP server will be disabled.
If set to
Relay
, the ZyXEL Device acts as a surrogate DHCP server and relays
DHCP requests and responses between the remote server and the clients.
Enter the IP address of the actual, remote DHCP server in the
Remote DHCP
Server
field in this case.
When DHCP is used, the following items need to be set:
IP Pool Starting
Address
This field specifies the first of the contiguous addresses in the IP address pool.
Pool Size
This field specifies the size, or count of the IP address pool.

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