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4.3 DHCP (DHCP Settings)

DHCP stands for Dynamic Host Configuration Protocol. The DHCP section is where you

configure the built-in DHCP Server to assign IP addresses to the computers and other

devices on your local area network (LAN).

Use the DHCP sub-menu to configure the built-in DHCP Server to assign IP addresses

to the computers and other devices on the local area network.

4.3.1

DHCP Server Settings

Enable DHCP Server.

(Default: Enabled). Once your MBR1200 router is properly

configured and this option is enabled, the DHCP Server will manage the IP addresses

and other network configuration information for computers and other devices connected

to your Local Area Network. There is no need for you to do this yourself.

The computers (and other devices) connected to your LAN also need to have their

TCP/IP configuration set to "DHCP" or "Obtain an IP address automatically".

When you set

Enable DHCP Server

, the following options are displayed.

DHCP IP Address Range.

(Default: 192.168.0.100-192.168.0.199). This option defines

the range of addresses available for the MBR1200 to assign to an internal network. If

there are any devices using static IP addresses, you must be sure the addresses do not

fall within the range defined here. A Static IP address is one that is entered in manually

on the device.

Example: The MBR1200 uses an IP address of 192.168.0.1. A computer designated as

a Web server has a static IP address of 192.168.0.3. Another computer is designated as

an FTP server with a static IP address of 192.168.0.4. The starting IP address for the

DHCP server needs to be 192.168.0.5 or above.

DHCP Lease Time.

(Default: 1440 minutes [24 hours]). The amount of time a computer

may have an IP address before it is required to renew the lease. The initial lease

designates the amount of time before the lease expires. If the lease expires and the

address is no longer needed, then another tenant may use the address. Units are in

minutes, however a value of zero (0) means the lease never expires.

Always Broadcast.

If all the computers on the LAN successfully obtain their IP

addresses from the router‟s DHCP server, this option can remain disabled. However, if

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one of the computers on the LAN fails to obtain an IP address, it may have an old DHCP client that incorrectly turns off the broadcast flag of

DHCP packets. Enabling

Always Broadcast

will cause the router to always broadcast its responses to all clients, thereby working around the

problem (at the cost of increased broadcast traffic on the LAN).

NetBIOS Announcement.

Check this box to allow the DHCP Server to

offer NetBIOS configuration settings to the LAN hosts. NetBIOS allows

LAN hosts to discover all other computers within the network, e.g. within

“Network Neighborhood.”

Learn BIOS from WAN.

If NetBIOS advertisement is switched on, WINS

information will be learned from the WAN side, if available. Turn this

setting off to configure manually.

NetBIOS Scope.

This is an advanced setting and is normally left blank.

This allows the configuration of a NetBIOS “domain” name under which

network hosts operate. This setting has no effect if the

Learn NetBIOS

information from WAN

is activated.

NetBIOS Node Type.

Indicates how network hosts are to perform

NetBIOS name registration and discovery. This setting has no effect if the

Learn

NetBIOS information from WAN

is activated.



Broadcast only.

This setting is useful where there are no

WINS servers available, however, it is preferred you try

Mixed-Mode

operation first.



Point-to-Point

Mode. This setting indicates to use WINS

servers ONLY. This setting is useful to force all NetBIOS

operation to the configured WINS servers. You must have configured at least the primary WINS server IP to point to a working WINS

server.



Mixed-Mode

(default). First broadcast operation is performed to register hosts and discover other hosts, if broadcast operation fails,

WINS

servers are tried, if any. This mode favors broadcast operation which may be preferred if WINS servers are reachable by a

slow network link and the majority of network services such as servers and printers are local to the LAN.



Hybrid-State.

First WINS servers are tried, if any, followed by local network broadcast. This is generally the preferred mode if you

have configured WINS servers.

Primary WINS IP Address.

Configure the IP address of the preferred WINS server. WINS Servers store information regarding network hosts,

allowing hosts to „register‟ themselves as well as discover other available hosts, e.g. for use in “Network Neighborhood.” This setting has no effect

if the

Learn NetBIOS information from WAN

is activated.

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Secondary WINS IP Address.

Configure the IP address of the backup WINS server, if any. This setting has no effect if the

Learn NetBIOS

information from WAN

is activated.

4.3.2

Number of Dynamic DHCP Clients.

This section displays what devices are currently leasing IP addresses. The

DHCP Client table displays the number of clients that are receiving an IP

address from the router, the computer name, MAC address, and IP address

assigned to each computer. You can use the

Revoke IP address

option to

take away a leased IP address from a client. This feature is useful for freeing

up addresses when the client table is full or nearly full.

4.3.3

Add DHCP Reservation

Clients configured as DHCP can receive the same IP address all the time

using this feature. This is almost the same as if a device has a static IP

address except that it must still actually request an IP address from the

MBR1200. The MBR1200 will provide the device the same IP address all the

time. Servers on the network should either use a static IP address or this

option.

Enable.

Specifies whether the entry will be active or inactive.

Computer Name.

You can assign a name for each computer that is given a

reserved IP address. This may help you keep track of which computers are

assigned this way. Example:

Game Server

.

IP Address

.

The LAN address that you want to reserve.

MAC Address

.

To input the MAC address of your system, enter it manually or connect to the route

r‟s Web

-Management interface from the system

and click the

Copy Your PC’s MAC Address

button.

A MAC address is usually located on a sticker on the bottom of a network device. The MAC address is comprised of twelve digits. Each pair of

hexadecimal digits are usually separated by dashes or colons such as 00-0D-88-11-22-33 or 00:0D:88:11:22:33. If your network device is a

computer and the network card is already located inside the computer, you can connect to the router from the computer and click the

Copy Your

PC’s MAC Address

button to enter the MAC address.

(continued)

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As an alternative, you can locate a MAC address in a specific

operating system by following the steps below:



Windows 98/Windows Me. Go to the computer‟s

Start

menu, select

Run

, type in

winipcfg

, and hit

Enter

. A

popup window will be displayed. Select the appropriate

adapter from the pull-down menu and you will see the

Adapter Address. This is the MAC address of the device.



Windows 2000/Windows XP/Windows 7. Go to the

computer‟s

Start

men

u,

select

Programs

,

select

Accessories

, and select

Command Prompt

. At the

command prompt, type in

ipconfig /all

and hit

Enter

.

The physical address displayed for the adapter connecting to the router is the MAC address.



Mac OS X. Go to the computer‟s Apple

Menu, select

System Preferences

, select

Network

, and select the

Ethernet Adapter

connecting

to the router. Select the

Ethernet

button and the

Ethernet ID

will be listed. This is the same as the MAC.

Save/Update.

Record the changes you have made.

Clear.

Re-initialize this area of the screen, discarding any changes you have made.

When you are done editing the settings, you must click the

Save Settings

button at the top of the page to make the changes effective and

permanent.

Example: A DHCP reservation is used for making sure the router always gives a computer or device the same IP address. Let‟s s

ay you have a

Wi-Fi printer

that you want to

access via

the Internet. You can connect to the CradlePoint Router from the

Wi-Fi printer designated in this section

.

1.

Enter a designated IP address somewhere between the

Starting IP

and

Ending IP

addresses.

2. Click the

Copy Your PC’s MAC Address

button and the MBR1200 will detect the MAC address

of the device

and enter it automatically.

3.

The

printer

name can be entered in for reference but is not required.

4. Click the

Save Settings

button at the top of the page.

The IP address will now only be assigned to the designated

Wi-Fi printer

a

nd it will always receive the same IP address as long as it uses the

same wireless adapter.

Default: No static DHCP clients.

NOTE: If you replace the wireless adapter in a computer that is using Static DHCP, you will need to click the Copy the PC‟s M

AC Address button

again because every wireless adapter has a unique MAC address. The same goes for any network device. If you replace a network device such

as a print server, you will need to input the MAC address of the new print server into the Static DHCP configuration.

CRADLEPOINT

MBR1200 | USER MANUAL Firmware ver. 1.6.12

© 2010

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PAGE 23

4.3.4

DHCP Reservation List

The section shows the current DHCP Reservation List.

Certain required routes are predefined and cannot be

changed. Routes that you add can be changed by

clicking the

Edit

icon or can be deleted by clicking the

Delete

icon. When you click the

Edit

icon, the item is highlighted, and the

DHCP Reservation List

section is activated for editing. Click the

Enable

check box at the left to directly activate or de-activate the entry.

After you‟ve completed all modifications or deletions, you must click the

Save Settings

button at the top of the page to save your changes. The

router must reboot before new settings will take effect. You will be prompted

to Reboot the Device

or

Continue

. If you need to make additional

settings changes, click

Continue

. If you are finished with all configuration settings, click the

Reboot the Device

button.

Default: empty list.