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Page 101 / 237 Scroll up to view Page 96 - 100
Chapter 9 DHCP Server
NBG-418N v2 User’s Guide
101
Figure 71
Network > DHCP Server > General
The following table describes the labels in this screen.
9.5
Static DHCP 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
NBG-418N v2 sends to the DHCP clients.
To change your NBG-418N v2’s static DHCP settings, click
Network
>
DHCP Server
>
Static
DHCP
. The following screen displays.
Table 44
Network > DHCP Server > General
LABEL
DESCRIPTION
DHCP Mode
Select
DHCP server
from the drop-down list to have the NBG-418N v2 act as a DHCP
server. Otherwise, select
None
. DHCP (Dynamic Host Configuration Protocol, RFC
2131 and RFC 2132) allows individual clients (computers) to obtain TCP/IP
configuration at startup from a server. Choose
DHCP Server
option unless your ISP
instructs you to do otherwise. Choose
None
to disable the NBG-418N v2 acting as a
DHCP server. When configured as a server, the NBG-418N v2 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 Range
This field specifies the range of the contiguous addresses in the IP address pool for
LAN.
Max Lease Time
This field specifies the Maximum time interval the device can be idle before the IP
address on the LAN link is disconnected. Default is 120 minutes, maximum is 525600
minutes
DNS Sever1
Type the First DNS server IP address of the DHCP server.
DNS Sever2
Type the Second DNS server IP address of the DHCP server.
Apply
Click
Apply
to save your changes back to the NBG-418N v2.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 102 / 237
Chapter 9 DHCP Server
NBG-418N v2 User’s Guide
102
Figure 72
Network > DHCP Server > Static DHCP
The following table describes the labels in this screen.
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 NBG-418N v2’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.
The following screen displays.
Table 45
Network > DHCP Server > Static DHCP
LABEL
DESCRIPTION
Static DHCP Table
IP Address
Type the LAN IP address of a computer on your LAN.
MAC Address
Type the MAC address of a computer on your LAN.
Add
Click
Add
button to add a new static DHCP entry.
Update
Click
Update
button to modify the selected entry’s settings.
Delete
Click
Delete
button to delete the selected static DHCP entry.
Reset
Click
Reset
to clear the IP Address and MAC address box fields.
DHCP Static IP Table
Select
Click the
Select
radio button to select a static DHCP entry.
IP Address
This field displays the LAN IP address of a computer on your LAN.
MAC Address
This field displays the MAC address of a computer on your LAN.
Page 103 / 237
Chapter 9 DHCP Server
NBG-418N v2 User’s Guide
103
Figure 73
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.
Host Name
This field displays the computer Host name.
IP Address
This field displays the IP address of the computers on the LAN port.
MAC Address
This field shows the MAC address of the computer with the name in the
Host Name
field.
Every Ethernet device has a unique MAC (Media Access Control) address which
uniquely identifies a device. The MAC address is assigned at the factory and consists
of six pairs of hexadecimal characters, for example, 00:A0:C5:00:00:02.
Reserve
Select this if you want to reserve the IP address for this specific MAC address.
Apply
Click
Apply
to save your changes back to the NBG-418N v2.
Refresh
Click
Refresh
to reload the DHCP table.
Page 104 / 237
NBG-418N v2 User’s Guide
104
C
HAPTER
10
Network Address Translation
10.1
Overview
This chapter discusses how to configure NAT on the NBG-418N v2.
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.
Each packet has two addresses – a source address and a destination address. For outgoing packets,
NAT maps private (local) IP addresses to globally unique ones required for communication with
hosts on other networks. It replaces the original IP source address in each packet and then
forwards it to the Internet. The NBG-418N v2 keeps track of the original addresses and port
numbers so incoming reply packets can have their original values restored. The following figure
illustrates this.
Figure 74
NAT Example
For more information on IP address translation, refer to
RFC 1631
,
The IP Network Address
Translator (NAT)
.
Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from
the WAN to be forwarded through the NBG-418N v2.
A: 192.168.1.33
B: 192.168.1.34
C: 192.168.1.35
IP address
192.168.1.1
WAN
LAN
assigned by ISP
FTP, Telnet, SNMP
Port 80
Ports 21 to 25
Page 105 / 237
Chapter 10 Network Address Translation
NBG-418N v2 User’s Guide
105
10.2
What You Can Do
•
Use the
General
screen to enable NAT and set a default server (
Section 10.3 on page 106
).
•
Use the
Application
screen to change your NBG-418N v2’s port forwarding settings (
Section
10.4 on page 107
).
•
Use the
Port Triggering
screen to change your NBG-418N v2’s port trigger settings (
Section
10.5 on page 108
).
10.2.1
What You Need To Know
The following terms and concepts may help as you read through this chapter.
Inside/Outside
This denotes where a host is located relative to the NBG-418N v2, for example, the computers of
your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
Global/Local
This denotes the IP address of a host in a packet as the packet traverses a router, for example, the
local address refers to the IP address of a host when the packet is in the local network, while the
global address refers to the IP address of the host when the same packet is traveling in the WAN
side.
Note: Inside/outside refers to the location of a host, while global/local refers to the IP
address of a host used in a packet.
An inside local address (ILA) is the IP address of an inside host in a packet when the packet is still
in the local network, while an inside global address (IGA) is the IP address of the same inside host
when the packet is on the WAN side. The following table summarizes this information.
Note: NAT never changes the IP address (either local or global) of an outside host.
What NAT Does
In the simplest form, NAT changes the source IP address in a packet received from a subscriber
(the inside local address) to another (the inside global address) before forwarding the packet to the
WAN side. When the response comes back, NAT translates the destination address (the inside
global address) back to the inside local address before forwarding it to the original inside host. Note
that the IP address (either local or global) of an outside host is never changed.
Table 47
NAT Definitions
ITEM
DESCRIPTION
Inside
This refers to the host on the LAN.
Outside
This refers to the host on the WAN.
Local
This refers to the packet address (source or destination) as the packet travels on the LAN.
Global
This refers to the packet address (source or destination) as the packet travels on the WAN.

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