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Chapter 10 DHCP
NBG334W User’s Guide
126
10.4
Client List Screen
The DHCP table shows current DHCP client information (including
IP Address
,
Host
Name
and
MAC Address
) of LAN or Guest WLAN network clients using the NBG334W’s DHCP
servers.
Configure this screen to always assign an IP address to a MAC address (and host name). Click
Network
>
DHCP Server
>
Client List
.
"
You can also view a read-only client list by clicking the
DHCP Table (Details...)
hyperlink in the
Status
screen.
The following screen displays.
First DNS Server
Second DNS
Server
Third DNS Server
Select
From ISP
if your ISP dynamically assigns DNS server information (and
the NBG334W's WAN IP address). The field to the right displays the (read-only)
DNS server IP address that the ISP assigns.
Select
User-Defined
if you have the IP address of a DNS server. Enter the DNS
server's IP address in the field to the right. If you chose
User-Defined
, but leave
the IP address set to 0.0.0.0,
User-Defined
changes to
None
after you click
Apply
. If you set a second choice to
User-Defined
, and enter the same IP
address, the second
User-Defined
changes to
None
after you click
Apply
.
Select
DNS Relay
to have the NBG334W act as a DNS proxy. The NBG334W's
LAN IP address displays in the field to the right (read-only). The NBG334W tells
the DHCP clients on the LAN that the NBG334W itself is the DNS server. When
a computer on the LAN sends a DNS query to the NBG334W, the NBG334W
forwards the query to the NBG334W's system DNS server (configured in the
WAN > Internet Connection
screen) and relays the response back to the
computer. You can only select
DNS Relay
for one of the three servers; if you
select
DNS Relay
for a second or third DNS server, that choice changes to
None
after you click
Apply
.
Select
None
if you do not want to configure DNS servers. If you do not configure
a DNS server, you must know the IP address of a computer in order to access it.
Apply
Click
Apply
to save your changes back to the NBG334W.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 49
Network > DHCP Server > Advanced
LABEL
DESCRIPTION
Page 127 / 296
Chapter 10 DHCP
NBG334W User’s Guide
127
Figure 71
Network > DHCP Server > Client List
The following table describes the labels in this screen.
Table 50
Network > DHCP Server > Client List
LABEL
DESCRIPTION
#
This is the index number of the host computer.
IP Address
This field displays the IP address relative to the # field listed above.
Host Name
This field displays the computer host name.
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 this check box in the
LAN DHCP Setup
or
Guest WLAN DHCP Setup
section to have the NBG334W always assign the IP address(es) to the MAC
address(es) (and host name(s)). After you click
Apply
, the MAC address and
IP address also display in the
Advanced
screen (where you can edit them).
Apply
Click
Apply
to save your settings.
Refresh
Click
Refresh
to reload the DHCP table.
Page 128 / 296
Chapter 10 DHCP
NBG334W User’s Guide
128
Page 129 / 296
NBG334W User’s Guide
129
C
HAPTER
11
Network Address Translation
(NAT)
This chapter discusses how to configure NAT on the NBG334W.
11.1
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 is changed to a different IP address known within another network.
11.2
Using NAT
"
You must create a firewall rule in addition to setting up NAT, to allow traffic
from the WAN to be forwarded through the NBG334W.
11.2.1
Port Forwarding: Services and Port Numbers
A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or
FTP, that you can make accessible to the outside world even though NAT makes your whole
inside network appear as a single machine to the outside world.
Use the
Application
screen to forward incoming service requests to the server(s) on your local
network. 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.
In addition to the servers for specified services, NAT supports a default server. A service
request that does not have a server explicitly designated for it is forwarded to the default
server. If the default is not defined, the service request is simply discarded.
Page 130 / 296
Chapter 11 Network Address Translation (NAT)
NBG334W User’s Guide
130
"
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
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.
11.2.2
Configuring Servers Behind Port Forwarding 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 72
Multiple Servers Behind NAT Example
11.3
General NAT Screen
Click
Network > NAT
to open the
General
screen.
Figure 73
Network > NAT > General

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