Linksys WRT1900AC Router Manual PDF (Setup & Configuration Guide)

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WRT 1900AC

Setting Up: Advanced

HOW TO CONFIGURE UPnP

UPnP (Universal Plug and Play) allows devices connected to a network to discover

each other and automatically create working configurations. Examples of UPnP-

capable devices include web cameras, online gaming applications, and VoIP devices.

UPnP is enabled by default.

To configure UPnP, do the following:

•

page ¶.)

•

Under

Router Settings

, click

Connectivity

, then click the

Administration

tab.

•

To use UPnP, select

Enabled

(default) next to

UPnP

•

To allow changing router settings while using UPnP, select

Allow Users to Configure

•

To prevent local network users from disabling your Internet connection through

UPnP, deselect the

Allow users to disable Internet access

checkbox.

•

Click

HOW TO USE A ROUTER AS AN ACCESS POINT

If you have a large area to cover with your wireless signal, or if part of your home has

weak signals due to interference, you can use this router to extend the range of your

old router’s wireless network.

To set up your new router as an access point, do the following:

•

Use a network cable to connect this router’s Internet port to the Ethernet or LAN

port on the router that is connected to your modem.

•

page ¶.)

•

Under

Router Settings

, click

Connectivity

, then click the

Internet Settings

tab.

•

Click

IPv4

•

For

Type of Internet Connection

, select

Bridge Mode

•

Click

Obtain an IPv4 address automatically

, then click

. The new router’s LAN IP ad-

dress will be changed and obtained from the router that is connected to your modem.

If you have a large area to cover with your wireless signal, or if part of your home has

weak signals due to interference, you can use your old router to extend the range of

your wireless network. This is a complex process, so this procedure

assumes that you have some networking knowledge.

Tip:

Check the documentation for your old router. Some brands of routers include

either a switch on the outside of the case or a software option to convert it to

an access point. If either of these options is available, follow your old router’s

instructions to convert it to an access point.

You need to take note of your new router’s settings, and apply some of those

settings to the old router so it can work as an access point.

To view your new router’s settings, do the following:

•

Make sure that your new router is connected to the Internet.

•

page ¶.)

•

Under

Router Settings

click

Wireless

. Take note of the

Network name (SSID)

Password

Security mode

, and

Channel.

•

Under

Router Settings

, click

Connectivity

, then click the

Local Network

tab. Take note

of the DHCP server’s IP address range (192.168.1.100 to 192.168.1.149 by default).

Page 37 / 108

WRT 1900AC

Setting Up: Advanced

To use your old router as an access point, do the following:

•

With your computer connected to your old router, log into its browser-based

administration utility.

Note:

Save your changes after finishing each step below.

•

Open the setup page for the local network (LAN).

•

In the

Router IP address

field, enter an unused IP address for the LAN network

of your new router.

For example, if your new router has an IP address of 192.168.1.1, you should choose

an IP address on the 192.168.1.0 network. You can choose any address within

the range of 192.168.1.2 to 192.168.1.254. You should exclude addresses in the

range that will be used by the DHCP Server of your new router (192.168.1.100 to

192.168.1.149). A safe choice might be 192.168.1.250. Take note of this address,

because this will be the address that you will use to manage your old router in the

future.

•

In the

Subnet Mask

field, enter “255.255.255.0” or, if available, select that

subnet mask from a drop-down list.

Disable the DHCP server on your old router. (Because your old router will be

operating as an access point instead of a router, you don’t want it to distribute IP

addresses. There should be only one active DHCP server on your network, and

that should be your new router.)

To reconfigure the wireless network on your old router, do the following:

•

Open the wireless network setup page.

•

Change the network name (SSID) to match the name of your new network. Having

the same network name and security settings enables you to seamlessly roam

between your new router and your old router.

•

Change the security mode to match the security mode on your new router.

•

Change the password (sometimes called the pre-shared key) on your old router to

match the password on your new router.

•

Change the wireless channel to a non-conflicting channel. Some manufacturers

have an Auto function for channel selection that automatically selects a wire-

less channel that does not interfere with other nearby wireless networks. If your

old router supports an Auto function, select that. Otherwise, you may need to

manually select the wireless operating channel on your old router. In the 2.4 GHz

wireless spectrum, there are only three non-overlapping channels: 1, 6, and 11.

Pick a channel that does not overlap the operating channel of your new router. For

example, if your new router is operating on channel 11, configure your old router for

either channel 1 or channel 6.

•

Connect an Ethernet network cable to one of the LAN/Ethernet ports on your old

router and an Ethernet port on your new router.

Caution:

Do not connect the cable to the Internet port on your old router. If you do, you

may not be able to set up the router as an access point on the current network.

Page 38 / 108

WRT 1900AC

Setting Up: Advanced

HOW TO PUT YOUR NEW ROUTER BEHIND AN EXISTING

ROUTER

There are several reasons you might want to use your new router “behind”

another router:

•

You might be in an environment that shares the landlord’s Internet connection

with all tenants. In this case, you should put your own router behind the landlord’s

router in order to create your own private network and to isolate computers on

your network from the rest of the building.

•

You are sharing an office building Internet connection, and you want to control

Internet access or the content viewed by your employees.

•

You already have an existing network and you want to extend the network’s range

or add wireless capabilities to your network.

•

You want to separate older, less secure network devices from the rest of the

network.

TO ADD YOUR ROUTER TO AN EXISTING ROUTER OR

GATEWAY

In most cases, you can easily add your router to an existing wireless network by

running Linksys Smart Wi-Fi. If you are unable to set up the additional router using

the instructions below, see “To share an Internet connection” on page 36 or “To

extend your network” on page 37.

To add your router to your existing wireless network, do the following:

•

Connect your router’s Internet port to the LAN/Ethernet port on your existing

(upstream) router or gateway.

•

Connect to the secure wireless name shown in the

Quick Start Guide

that came

with your router. (You can change the network name and password later during

router setup.) If you need help connecting to the network, refer to your device

documentation.

Note:

You will not have Internet access until router setup is

complete.

•

Open a web browser and follow the instructions to complete your router’s setup. If

instructions do not appear in the web browser, enter

linksyssmartwifi.com

in the

browser’s address bar.

•

At the end of setup, follow the on-screen instructions to set up your Linksys Smart

Wi-Fi account.

Note:

As part of the router setup process, you will be sent a verification email. From

your home network, click the link in the email to associate your router with the

Linksys Smart Wi-Fi account. Make sure that the link opens in a supported

web browser, such as Internet Explorer 8 or higher, Firefox 8 or higher, Google

Chrome 10 or higher, and Safari 5 (for Mac) or higher.

Page 39 / 108

WRT 1900AC

| Setting Up: Advanced

TO SHARE AN INTERNET CONNECTION

Note:

This is a complex process, so this procedure assumes that you have some

networking knowledge.

To add another router to share an Internet connection, do the following:

This topic covers cases one and two above

•

Determine the IP address range for your upstream (office or building) network.

•

To determine the address range by using a Windows computer:

•

Connect your computer to your upstream network’s router.

•

Click

Start

Run

, type

CMD

, then click

. The command prompt window appears.

•

Type “ipconfig,” then press

Enter

Tip:

Although you can determine your computer’s IP address in many ways, this

method is quick and relatively easy.

•

Take note of the IP address. In this example, the IP address is

192.168.100.192.

•

To determine the address range by using a Mac computer:

•

Connect your computer to your upstream network’s router.

•

From the Dock, click

System preferences

, click

Network

, then click

Ethernet

the window to the left. A network status window opens.

•

Take note of the IP address. In this example, the IP address is

192.168.100.139.

•

Example: The above examples show that upstream IP addresses are on the

192.168.100.0 network. (The “0” indicates the entire network.) Your upstream

network’s address may be different. The default address of your new Linksys

router is 192.168.1.1. In setting up one router behind another, you must make sure

that the local network on your new router is different than the network of your

upstream router. In the above example, because the default local network on

your Linksys router 192.168.1.0 is on a different subnet than the office network’s

192.168.100.0, you will be able to place your Linksys router behind the other router.

•

Connect an Ethernet network cable to a LAN/Ethernet port on your upstream

network to the yellow Internet port on your router.

Caution:

Connect the upstream network to your router’s yellow Internet port, not one of

the blue Ethernet ports. If you connect to an Ethernet port, you create IP ad-

dressing problems for the office network.

Tips:

An office network often has a wall plate with an Ethernet port that you can

connect to.

If you are doing this in a home environment (without wall ports), connect an

Ethernet network cable between a LAN port on your upstream router and the

Internet port on your Linksys router.

Run your router’s setup CD on each computer that you want to connect to the

Linksys router. Each computer needs either a wired or wireless connection to the

Linksys router. For more information, see “How to connect a computer to your

network” on page 1².

The computers that are connected to the Linksys router are now on the same

network, and are isolated from the upstream network. However, you will still have

access to the Internet through the upstream router (by way of your Linksys router).

Because two routers are between your computer and the Internet, Internet traffic

undergoes two network address translations. This is sometimes referred to as

Double NAT.

Your computers can also use the built-in capabilities of your Linksys router, such

as parental controls. If you need further control over the type of content your em-

ployees or family access, you can create an account with an Internet filtering site

such as www.opendns.com or www.bsecure.com. After you create an account

with them, use their DNS in place of your ISP’s DNS.

Page 40 / 108

WRT 1900AC

Setting Up: Advanced

HOW TO EXPOSE A DEVICE TO THE INTERNET

If you are operating a Web server, a mail server, or a Web camera, you may want to

expose that device to the Internet so anybody can access it. Your router includes

a DMZ (Demilitarized Zone) feature that forwards all inbound ports presented on

the WAN interface, except those that are specifically forwarded, to an individual

IP address or MAC address. This feature is normally not used, because it presents

significant security risks to the device that you designate for the DMZ. The DMZ

device is not protected by the built-in firewalls, Internet filters, or router Web

filters, and is open to attacks from hackers.

A much safer way of exposing devices to the Internet would be to use port

forwarding. See “How to set up port forwarding” on page 39.

To set up a device in the DMZ, do the following:

•

Configure your device with a static IP address. See your device’s documentation

for help with setting a static IP address or use DHCP reservation (see “How to set

up the DHCP server on your router” on page 27).

•

page ¶.)

•

Under

Router Settings

, click

Security

, then click the

DMZ

tab.

•

Click the setting for

DMZ

to turn it on.

To use their DNS:

•

Log into Linksys Smart Wi-Fi. (See “How to connect to Linksys Smart Wi-Fi” on

page ¶.)

•

Under

Router Settings

, click

Connectivity

•

Click the

Local Network

tab.

•

Complete the

Static DNS

fields with the information provided by your content

filtering provider.

•

Click

TO EXTEND YOUR NETWORK

This topic covers cases three and four above.

Note:

This is a complex process, so this procedure assumes that you have some

networking knowledge.

To extend your network or add wireless capabilities, do the following:

•

If you want to extend your network, you may also follow the instructions above.

One example of this might be to provide a separate wireless network for your

children to keep their wireless network traffic separate from your wireless network.

You might also want to isolate one network from another network so that network

shares aren’t visible across networks. In this case, use an Ethernet cable to connect

the Internet port of the downstream router to one of the LAN ports of the upstream

router. Make sure that the local network subnets on the two routers are different.

- OR -

•

You can extend your network by turning the downstream router into an access

point. (See “How to use a router as an access point” on page 34.) When you use

a router as an access point, computers connected to the access point are on the

same IP subnet as all other devices connected to the router. File, printer, and

media sharing is much easier if all devices are on the same subnet.

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