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Page 111 / 268 Scroll up to view Page 106 - 110
NBG4604 User’s Guide
111
C
HAPTER
9
DHCP Server
9.1
Overview
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 NBG4604’s LAN as a DHCP server or disable it. When configured as a
server, the NBG4604 provides the TCP/IP configuration for the clients. If DHCP
service is disabled, you must have another DHCP server on your LAN, or else the
computer must be manually configured.
9.2
What You Can Do
•
Use the
General
screen (
Section 9.4 on page 112
) to enable the DHCP server.
•
Use the
Advanced
screen (
Section 9.5 on page 112
) to assign IP addresses on
the LAN to specific individual computers based on their MAC Addresses.
•
Use the
Client List
screen (
Section 9.6 on page 114
) to view the current DHCP
client information.
9.3
What You Need To Know
Every Ethernet device has a unique MAC (Media Access Control) address. The MAC
address is assigned at the factory and consists of six pairs of hexadecimal
characters, for example, 00:A0:C5:00:00:02. Find out the MAC addresses of your
network devices if you intend to add them to the DHCP Client List screen.
Refer to
Section 2.4.6 on page 31
for information on IP Address and Subnet Mask.
Refer to the
Section 2.4.7 on page 32
section for information on System DNS
Servers.
Page 112 / 268
Chapter 9 DHCP Server
NBG4604 User’s Guide
112
9.4
General Screen
Use this screen
to enable the DHCP server. Click
Network
>
DHCP Server
.
The
following screen displays.
Figure 68
Network > DHCP Server > General
The following table describes the labels in this screen.
9.5
Advanced Screen
This screen allows you to assign IP addresses on the LAN to specific individual
computers based on their MAC addresses. You can also use this screen to
configure the DNS server information that the NBG4604 sends to the DHCP
clients.
Table 44
Network > DHCP Server > General
LABEL
DESCRIPTION
Enable DHCP
Server
Enable or Disable DHCP for LAN.
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC
2132) allows individual clients (computers) to obtain TCP/IP
configuration at startup from a server. Leave the
Enable DHCP
Server
check box selected unless your ISP instructs you to do
otherwise. Clear it to disable the NBG4604 acting as a DHCP server.
When configured as a server, the NBG4604 provides TCP/IP
configuration for the clients. If not, DHCP service is disabled and
you must have another DHCP server on your LAN, or else the
computers must be manually configured. When set as a server, fill in
the following four fields.
IP Pool Starting
Address
This field specifies the first of the contiguous addresses in the IP
address pool for LAN.
Pool Size
This field specifies the size, or count of the IP address pool for LAN.
Apply
Click
Apply
to save your changes back to the NBG4604.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 113 / 268
Chapter 9 DHCP Server
NBG4604 User’s Guide
113
To change your NBG4604’s static DHCP settings, click
Network
>
DHCP Server
>
Advanced
. The following screen displays.
Figure 69
Network > DHCP Server > Advanced
The following table describes the labels in this screen.
Table 45
Network > DHCP Server > Advanced
LABEL
DESCRIPTION
Static DHCP Table
#
This is the index number of the static IP table entry (row).
MAC Address
Type the MAC address (with colons) of a computer on your LAN.
IP Address
Type the LAN IP address of a computer on your LAN.
DNS Server
DNS Servers
Assigned by
DHCP Server
The NBG4604 passes a DNS (Domain Name System) server IP
address (in the order you specify here) to the DHCP clients. The
NBG4604 only passes this information to the LAN DHCP clients when
you select the
Enable DHCP Server
check box. When you clear the
Enable DHCP Server
check box, DHCP service is disabled and you
must have another DHCP sever on your LAN, or else the computers
must have their DNS server addresses manually configured.
Page 114 / 268
Chapter 9 DHCP Server
NBG4604 User’s Guide
114
9.6
Client List Screen
The DHCP table shows current DHCP client information (including
IP Address
,
Host
Name
and
MAC Address
) of network clients using the NBG4604’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
.
Note: You can also view a read-only client list by clicking the
DHCP Table (Details...)
hyperlink in the
Status
screen.
First DNS Server
Second DNS
Server
Select
From ISP
if your ISP dynamically assigns DNS server
information (and the NBG4604'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 NBG4604 act as a DNS proxy. The
NBG4604's LAN IP address displays in the field to the right (read-
only). The NBG4604 tells the DHCP clients on the LAN that the
NBG4604 itself is the DNS server. When a computer on the LAN sends
a DNS query to the NBG4604, the NBG4604 forwards the query to the
NBG4604'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 NBG4604.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 45
Network > DHCP Server > Advanced
LABEL
DESCRIPTION
Page 115 / 268
Chapter 9 DHCP Server
NBG4604 User’s Guide
115
The following screen displays.
Figure 70
Network > DHCP Server > Client List
The following table describes the labels in this screen.
Table 46
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
DHCP Setup
section to have the
NBG4604 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.

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