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Page 111 / 427 Scroll up to view Page 106 - 110
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 8 LAN Setup
111
8.2.3
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.
8.2.4
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.
Page 112 / 427
P-2602H(W)(L)-DxA Series User’s Guide
112
Chapter 8 LAN Setup
Figure 54
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.
8.2.4.1
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.
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.
Page 113 / 427
P-2602H(W)(L)-DxA Series User’s Guide
Chapter 8 LAN Setup
113
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.
8.3
Configuring LAN IP
Click
Network > LAN
to open the
IP
screen. See
Section 8.1 on page 107
for background
information.
Figure 55
LAN IP
The following table describes the fields in this screen.
8.3.1
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.
Table 30
LAN IP
LABEL
DESCRIPTION
LAN 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.
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Chapter 8 LAN Setup
Figure 56
Advanced LAN Setup
The following table describes the labels in this screen.
Table 31
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.
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.
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Chapter 8 LAN Setup
115
8.4
DHCP Setup
Click
Network > DHCP Setup
to open this screen. Use this screen to configure the DNS
server information that the ZyXEL Device sends to the DHCP client devices on the LAN.
Figure 57
DHCP Setup
The following table describes the labels in this screen.
Table 32
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.
Remote DHCP
Server
If
Relay
is selected in the
DHCP
field above then enter the IP address of the
actual remote DHCP server here.
DNS Server
DNS Servers
Assigned by DHCP
Server
The ZyXEL Device passes a DNS (Domain Name System) server IP address to
the DHCP clients.

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