Cisco RV042G Router Manual PDF (Setup & Configuration Guide)

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DHCP

Setting Up the DHCP Server or DHCP Relay

Cisco Small Business RV0xx Series Routers Administration Guide

66

4

About Static IP Addresses (for IPv4 Only)

When DHCP is enabled, you may wish to assign static IP addresses to certain

devices, such as a web server or an FTP server. You can add up to 100 devices to

the

Static IP

list.

TIP

Ensure that each of these devices is configured to use a static IP address. For

example, on a Windows computer, open the Local Area Connection Properties,

select

Internet Protocol (TCP/IP)

, and then click the

Properties

button. Choose

Use the following IP address

, and enter the IP address, subnet mask, and default

gateway (the router IP address). Optionally, enter a preferred DNS server.

Choose devices from a list or enter the device IP addresses and MAC addresses

manually.

•

Assigning static IP addresses by adding devices from a list, page 66

•

Assigning static IP addresses by entering devices manually, page 67

•

Using the Static IP List to Block Devices, page 68

NOTE

You can use this feature even if the router is not the DHCP server.

Assigning static IP addresses by adding devices from a list

STEP 1

Click

Show unknown MAC addresses

. The

IP & MAC binding list

appears. If the

web browser displays a message about the pop-up window, allow the blocked

content.

Page 67 / 199

DHCP

Setting Up the DHCP Server or DHCP Relay

Cisco Small Business RV0xx Series Routers Administration Guide

67

4

The devices are listed by the IP address and the MAC address. (Typically the MAC

address appears on a label on the bottom panel or back panel of a device.) If

needed, you can click

Refresh

to update the data.

STEP

2

To select a device, first enter a descriptive

Name

. Then check the

Enable

box.

Alternatively, select all devices in the list by clicking the check box at the top of the

Enable

column.

STEP

3

Click

OK

to add the devices to the

Static IP

list, or click

Close

to close the pop-up

window without adding the selected devices. After you click

OK

, a message

appears. The message includes important information. Read it before clicking

OK

.

Keep the browser open and wait until the selected MAC addresses appear in the

Static IP

list.

STEP

4

Modify or remove list entries, as needed:

•

To modify the settings:

Click a device in the list. The information appears in

the text fields. Make the changes, and then click

Update

. If you do not need

to make changes, you can click

Add New

to de-select the entry and clear the

text fields.

•

To delete an entry from the list:

Click the entry that you want to delete, and

then click

Delete

. To select a block of entries, click the first entry, hold down

the

Shift

key, and then click the final entry in the block. To select individual

entries, press the

Ctrl

key while clicking each entry. To de-select an entry,

press the

Ctrl

key while clicking the entry.

Assigning static IP addresses by entering devices manually

In the

Static IP Address

section, add or edit entries as needed. Remember that the

settings are not saved until you click the Save button.

•

To add a new device to the list:

Enter the following information, and then

click

Add to list

.

-

Static IP Address:

Enter the static IP address. You can enter 0.0.0.0 if

you want the router to assign a static IP address to the device.

-

MAC Address:

Enter the MAC address of the device. (Typically the MAC

address appears on a label on the bottom panel or the back panel of a

device.) Enter the address without punctuation.

-

Name:

Enter a descriptive name for the device.

-

Enable:

Check this box to assign the static IP address to this device.

•

To add another new entry:

Enter the information, and then click

Add to list

.

Page 68 / 199

DHCP

Setting Up the DHCP Server or DHCP Relay

Cisco Small Business RV0xx Series Routers Administration Guide

68

4

•

To modify the settings:

Click a device in the list. The information appears in

the text fields. Make the changes, and then click

Update

. If you do not need

to make changes, you can click

Add New

to de-select the entry and clear

the text fields.

•

To delete an entry from the list:

Click the entry that you want to delete, and

then click

Delete

. To select a block of entries, click the first entry, hold down

the

Shift

key, and then click the final entry in the block. To select individual

entries, press the

Ctrl

key while clicking each entry. To de-select an entry,

press the

Ctrl

key while clicking the entry.

Using the Static IP List to Block Devices

You can use the

Static IP list

to control access to your network. You can block

access by devices that are not on the list or do not have the correct IP address.

STEP 1

Add devices to the

Static IP list

as described in

About Static IP Addresses (for

IPv4 Only), page 66

.

STEP

2

Enable or disable the following features:

•

Block MAC address on the list with wrong IP address:

Check this box to

prevent a computer from accessing your network if its IP address has been

changed. For example, if you previously assigned a static IP address of

192.168.1.100 and someone configures the device to use 192.168.149, the

device will not be allowed to connect to your network. This feature

discourages users from changing their device IP addresses without your

permission. Uncheck the box to allow access regardless of the current IP

address assignment.

•

Block MAC address not on the list:

Check this box to block access from

devices that are not included in the

Static IP list

. This feature prevents

unknown devices from accessing your network. Uncheck the box to allow

access by any connected device that is configured with an IP address in

the correct range.

Page 69 / 199

DHCP

Setting Up the DHCP Server or DHCP Relay

Cisco Small Business RV0xx Series Routers Administration Guide

69

4

DNS Local Database

Domain Name Service (DNS) is a service that matches a domain name to its

routable IP address. You can set up a DNS Local Database that enables the router

to act as a local DNS server for commonly used domain names. Using a local

database may be faster than using an external DNS server. If a requested domain

name is not found in the local database, then the request is forwarded to the DNS

server that is specified on the

Setup > Network

page,

WAN Setting

section.

If you enable this feature, you also must configure the client devices to use the

router as the DNS server. By default, Windows computers are set to obtain a DNS

server address automatically, from the WAN settings. You need to change the

TCP/IP connection settings. For example, on a PC running Windows, go to the

Local Area Connection Properties > Internet Protocol > TCP/IP Properties

window. Choose

Use the following DNS server address

, and then enter the LAN

IP address of the router as the Preferred DNS Server. For more information, refer to

the documentation for the client that you are configuring.

Add or update entries as needed. Remember that the settings are not saved until

you click the Save button.

•

To add a new entry:

Enter the following information. Then click

Add to list

.

-

Host Name:

Enter the domain name, such as

example.com

or

example.org

. If you do not include the final level of the domain name,

Microsoft Windows® will automatically append your entry with

.com

.

-

IP Address

: Enter the IP address of the resource.

•

To add another new entry:

Enter the information, and then click

Add to list

.

•

To modify the settings for a device:

Click a device in the list. The

information appears in the text fields. Make the changes, and then click

Update

. If you do not need to make changes, you can click

Add New

to de-

select the entry and clear the text fields.

•

To delete an entry from the list:

Click the entry that you want to delete, and

then click

Delete

. To select a block of entries, click the first entry, hold down

the

Shift

key, and then click the final entry in the block. To select individual

entries, press the

Ctrl

key while clicking each entry. To de-select an entry,

press the

Ctrl

key while clicking the entry.

Page 70 / 199

DHCP

Viewing the DHCP Status Information

Cisco Small Business RV0xx Series Routers Administration Guide

70

4

Viewing the DHCP Status Information

Use the

DHCP >

Status

page to view the status of the DHCP server and its clients.

You can click

Refresh

to refresh the data. To release a client’s IP address, you can

click the

Delete

icon.

To open this page:

Click

DHCP > DHCP Status

in the navigation tree.

DHCP Server

For the DHCP server, the following information is shown:

•

DHCP Server:

The IP address of the DHCP server

•

Dynamic IP Used:

The number of dynamic IP addresses used.

•

Static IP Used (IPv4 only):

The number of static IP addresses used.

•

DHCP Available:

The number of dynamic IP addresses available

•

Total:

The total number of dynamic IP addresses that can be assigned by

the DHCP server.

Client Table

For all network clients using the DHCP server, the Client Table shows the current

DHCP client information. Click the

IPv4

tab or the

IPv6

tab to view the clients.

Note: The IPv6 tab is available only if you enabled Dual-Stack IP on the

Network >

Setup

page.

•

Client Host Name:

The name assigned to a client host.

•

IP Address:

The dynamic IP address assigned to a client.

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