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Page 81 / 300 Scroll up to view Page 76 - 80
Chapter 6 LAN Setup
P-663HN-51 User’s Guide
81
Enable UPnP
Select this check box to activate UPnP. Be aware that anyone could
use a UPnP application to open the web configurator's login screen
without entering the ZyXEL Device's IP address (although you must
still enter the password to access the web configurator).
Enable IGMP
Snooping
Turn on IGMP snooping to reduce network traffic by having the ZyXEL
Device only forward multicast traffic to ports connected to computers
or devices that belong to the specific multicast group.
Use standard mode to flood unknown multicast traffic.
Use blocking mode to discard unknown multicast traffic.
Disable/Enable
DHCP Server
Turn on the DHCP server to have the ZyXEL Device assign IP
addresses, an IP default gateway and DNS servers to DHCP clients on
the LAN.
Enter IP addresses in the
Start
and
End IP Address
fields to set a
range of IP addresses for the ZyXEL Device to give to the DHCP
clients.
Enter an IP address in the
Start IP Address
field and a subnet mask
in the
Subnet Mask
field to set a subnet of IP addresses for the
ZyXEL Device to give to the DHCP clients.
Leased Time
sets how many hours to let a DHCP client use an IP
before re-assigning it an IP address.
Static IP Lease
List
Configure static IP addresses the ZyXEL Device’s DHCP server assigns
to specific LAN computers. If a computer’s MAC address is in the LAN’s
static DHCP table, the ZyXEL Device assigns the corresponding IP
address. Otherwise, the ZyXEL Device assigns an IP address
dynamically.
MAC Address
This is the MAC address of a LAN computer.
IP Address
This is the IP address the ZyXEL Device assigns to the device with this
entry’s MAC address.
Remove
Select this for one or more entries and click
Remove Entries
to
remove the entries.
Add Entries
Click this to go to the screen where you can configure a static DHCP IP
entry.
Remove Entries
Select
Remove
for one or more entries and click this to remove the
entries.
Configure the
second IP
address and
subnet mask for
LAN interface
Select this option to let the ZyXEL Device use a second IP address on
the LAN interface. You can also use this second IP address to access
the ZyXEL Device for management. Enter the LAN IP address of your
ZyXEL Device in dotted decimal notation, for example, 10.0.0.1. Type
the subnet mask.
Save
Click
Save
to save your changes to the ZyXEL Device.
Save/Reboot
Click this button to apply and save your changes. The ZyXEL Device
restarts.
Table 21
Advanced Setup > LAN (continued)
LABEL
DESCRIPTION
Page 82 / 300
Chapter 6 LAN Setup
P-663HN-51 User’s Guide
82
6.6
The DHCP Static Lease Screen
In the
Advanced Setup > LAN
screen, click
Add Entries
to open the
DHCP
Static Lease
screen. Use this screen to configure the list of static IP addresses
the ZyXEL Device assigns to computers connected to the interface. If a computer’s
MAC address is in the LAN’s static DHCP table, the ZyXEL Device assigns the
corresponding IP address. Otherwise, the ZyXEL Device assigns an IP address
dynamically using the interface’s
Start Address
and
Pool Size
.
You must click
Save/Apply
in this screen and then
Save
in the LAN setup screen
to save your changes.
Figure 34
DHCP Static IP Lease
The following table describes this screen.
Table 22
Static DHCP
LABEL
DESCRIPTION
MAC Address
Enter the MAC address to which to assign this entry’s IP address.
IP Address
Enter the IP address to assign to a device with this entry’s MAC
address.
Save/Apply
Click this to save your changes.
Page 83 / 300
P-663HN-51 User’s Guide
83
C
HAPTER
7
Network Address Translation
(NAT) Screens
This chapter discusses how to configure NAT on the ZyXEL Device.
7.1
NAT Overview
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP
address of a host in a packet, for example, the source address of an outgoing
packet, used within one network to a different IP address known within another
network.
7.2
NAT Virtual Servers
Configure NAT virtual server (port forwarding) entries to have the ZyXEL Device
forward traffic from the WAN to LAN computers.
You might do this to get particular games or services to work through NAT. You
can also make servers, for example, web or FTP, visible to the outside world even
though NAT makes your whole inside network appear as a single computer to the
outside world.
You may enter a single port number or a range of port numbers to be forwarded,
and the local IP address of the desired server. The port number identifies a
service; for example, web service is on port 80 and FTP on port 21. In some
cases, such as for unknown services or where one server can support more than
one service (for example both FTP and web service), it might be better to specify
a range of port numbers. You can allocate a server IP address that corresponds to
a port or a range of ports.
Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
Page 84 / 300
Chapter 7 Network Address Translation (NAT) Screens
P-663HN-51 User’s Guide
84
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
7.2.1
Virtual Server: Services and Port Numbers
See
Appendix E on page 281
for commonly used port numbers.
7.2.2
Virtual Servers Example
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (
A
in
the example), port 80 to another (
B
in the example) and assign a default server IP
address of 192.168.1.35 to a third (
C
in the example). You assign the LAN IP
addresses and the ISP assigns the WAN IP address. The NAT network appears as a
single host on the Internet.
Figure 35
Multiple Servers Behind NAT Example
7.3
Configuring Virtual Servers
Note: The NAT screens are available only when you enable NAT in the WAN
configuration.
Page 85 / 300
Chapter 7 Network Address Translation (NAT) Screens
P-663HN-51 User’s Guide
85
Click
Advanced Setup > NAT > Virtual Servers
to open the following screen.
Figure 36
Advanced Setup > NAT > Virtual Servers
See
Appendix E on page 281
for port numbers commonly used for particular
services. The following table describes the fields in this screen.
Table 23
NAT Port Forwarding
LABEL
DESCRIPTION
Add
Click this button to go to a screen where you can configure a new entry.
Remove
To remove an entry(ies), select its
Remove
check box and click the
Remove
button.
Server Name
This name identifies the virtual server entry.
External Port
Start, External
Port End
These are the ports of traffic coming in from the WAN to which this
virtual server entry applies.
Protocol
This is the underlying protocol of the traffic to which this virtual server
entry applies.
Internal Port
Start, Internal
Port End
These are the ports the ZyXEL Device uses for the traffic that it
forwards based on this virtual server entry.
Server IP
Address
This is the LAN IP address to which the ZyXEL Device forwards the
incoming traffic.

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