WARNING: This product contains chemicals, including lead,
known to the State of California to cause cancer, and birth defects
or other reproductive harm. Wash hands after handling.
How to Use this Guide
This User Guide has been designed to make understanding networking with the Router easier than ever.
Look for the following items when reading this Guide:
This checkmark means there is a note of interest and
is something you should pay special attention to while
using the Router.
This exclamation point means there is a caution or
warning and is something that could damage your
property or the Router.
This question mark provides you with a reminder about
something you might need to do while using the Router.
In addition to these symbols, there are definitions for technical terms that are presented like this:
word: definition.
Also, each figure (diagram, screenshot, or other image) is provided with a figure number and description,
like this:
Figure 0-1: Sample Figure Description
Figure numbers and descriptions can also be found in the “List of Figures” section in the “Table of
Contents”.
WRVS4400Nv2-UG-50426NC RR
Table of Contents
Chapter 1 : Introduction 1
Welcome 1
What’s in this Guide? 2
Chapter 2 : Networking and Security Basics 4
An Introduction to LANs 4
The Use of IP Addresses 5
The Intrusion Prevention System (IPS) 7
Chapter 3 : Planning Your Virtual Private Network (VPN) 9
Why do I need a VPN? 9
What is a VPN? 10
Chapter 4 : Getting to Know the Router 12
The Front Panel 12
The Back Panels 14
Antennas and Positions 15
Chapter 5 : Connecting the Router 16
Overview 16
Connection Instructions 17
Placement Options 18
Chapter 6 : Setting Up and Configuring the Router 20
Overview 20
Basic Setup 20
How to Access the Web-based Utility 21
How to Navigate the Utility 21
Setup Tab 25
Wireless Tab 38
Firewall Tab 47
VPN Tab 58
QoS Tab 65
Administration Tab 67
IPS Tab 72
L2 Switch Tab 76
Status Tab 80
Appendix A: Troubleshooting 85
Frequently Asked Questions 95
Appendix B: Using the Linksys QuickVPN Software for Windows 2000
or XP 99
Overview 99
Before You Begin 99
Installing the Linksys QuickVPN Software 100
Using the Linksys QuickVPN Software 101
Appendix C: Configuring a Gateway-to-Gateway IPSec Tunnel 103
Overview 103
Before You Begin 103
Configuring the VPN Settings for the VPN Routers 104
Configuring the Key Management Settings 106
Configuring PC 1 and PC 2 107
Appendix D: Finding the MAC Address and IP Address for
Your Ethernet Adapter 108
Windows 98 or Me Instructions 108
Windows 2000 or XP Instructions 108
For the Router’s Web-based Utility 109
Appendix E: Trend Micro ProtectLink Gateway Service 110
Appendix F: Glossary 110
Appendix G: Specifications 116
Appendix H: Warranty Information 119
Appendix I: Regulatory Information 120
Appendix J: Contact Information 126
List of Figures
Figure 2-1: Example network 5
Figure 2-2: IPS Scenarios 7
Figure 3-1: VPN Router to VPN Router 11
Figure 3-2: Computer to VPN Router 11
Figure 4-1: Front Panel 12
Figure 4-2: Back Panel 14
Figure 4-3: Stackable Position and its Antenna Setup 15
Figure 4-4: Standalone Position and its Antenna Setup 15
Figure 5-1: Example of a Typical Network 16
Figure 5-2: Connect a PC 17
Figure 5-3: Connect the Internet 17
Figure 5-4: Connect the Power 17
Figure 5-5: The Stand Option 18
Figure 5-6: Stand 18
Figure 5-7: Mounting Dimensions 19
Figure 5-8: Wall Mounting Hardware 19
Figure 6-1: Router’s IP Address 21
Figure 6-2: Login Screen for Web-based Utility 21
Figure 6-1: Setup - IP Versions 25
Figure 6-2: Setup - WAN (DHCP) 26
Figure 6-3: Setup - WAN (Static IP) 26
Figure 6-4: Setup - WAN (PPPoE) 27
Figure 6-5: Setup - WAN (PPTP) 27
Figure 6-6: Setup - WAN (Heart Beat Signal) 28
Figure 6-7: Setup - WAN (L2TP) 29
Figure 6-8: Setup - WAN (Optional Settings) 30
Figure 6-9: Setup - WAN (DynDNS.org) 31
Figure 6-10: Setup - WAN (TZO.com) 31
Thank you for choosing the Wireless-N Gigabit Security Router with VPN. The Wireless-N Gigabit
Security Router with VPN is an advanced Internet-sharing network solution for your small business needs.
The Router features a built-in 4-Port full-duplex 10/100/1000 Ethernet switch to connect four PCs directly,
or you can connect more hubs and switches to create as big a network as you need. Like any wireless router,
it lets multiple computers in your office share an Internet connection through both wired and wireless
connections. It can also be used as an intranet router to aggregate traffic to a company backbone network.
The Router has a built-in access point that supports the latest 802.11n draft specification by IEEE. It also
supports 802.11g and 802.11b clients in a mixed environment. The access point can support an 11n data
rate of up to 300 Mbps. Besides having a higher data rate, 802.11n technology also promises longer
coverage by using multiple antennas to transmit and receive data streams in different directions. Users are
encouraged to upgrade their firmware through www.linksys.com when 802.11n specification is finalized by
IEEE to ensure compatibility with all the wireless-N devices.
The Wireless-N Gigabit Security Router with VPN is equipped with advanced security technologies like
Intrusion Prevention System (IPS), Stateful Packet Inspection (SPI) Firewall, IP based Access List (IP
ACL), and Network Address Port Translation (NAPT, also called NAT as a more generic term). These
technologies work together by providing self-defensive strategy. Malicious attack traffic is identified,
classified, and stopped in real time while passing through the Router. Users are encouraged to update their
IPS signature file to stay current on stopping malicious worms. The SPI Firewall provides deep packet
inspection to analyze packets in network layer (IP) and transport layer (TCP, UDP) to block illegal packet
transactions. Users can also use IP based ACL to limit traffic to a specific source, destination and protocol.
NAPT allows users to open specific TCP/UDP port numbers to the Internet to provide limited service while
minimizing harmful traffic at the same time.
The Virtual Private Network (VPN) capability is another security feature that creates encrypted “tunnels”
through the Internet, allowing up to five remote offices and five traveling users to securely connect into
your office network from off-site. Users connecting through a VPN tunnel are attached to your company's
network with secure access to files, e-mail, and your intranet as if they were in the building. You can also
use the VPN capability to allow users on your small office network to securely connect out to a corporate
network. The QoS features provide consistent voice and video quality throughout your business.
This user guide will give you all the information you need to connect, set up, and configure your Router.
Ethernet: a network protocol that specifies how data is placed on and retrieved from a common
transmission medium.
This user guide covers the steps for setting up and using the Wireless-N Gigabit Security Router with VPN.
. • Chapter 1: Introduction This chapter describes the Wireless-N Gigabit Security Router
with VPN applications and this User Guide.
. • Chapter 2: Networking and Security Basics This chapter describes the basics of
networking and network security.
. • Chapter 3: Planning Your Virtual Private Network (VPN) This chapter describes a VPN
and its various applications.
. • Chapter 4: Getting to Know the Router This chapter describes the physical features of the
Router.
. • Chapter 5: Connecting the Router This chapter instructs you on how to connect the
Router to your network.
. • Chapter 6: Setting Up and Configuring the Router This chapter explains how to use the
Web-Based Utility to perform basic setup and configure its advanced settings.
. • Appendix A: Troubleshooting This appendix describes some problems and solutions, as
well as frequently asked questions, regarding installation and use of the Wireless-N Gigabit Security Router
with VPN.
. • Appendix B: Using the Linksys QuickVPN Software for Windows 2000 or XP This
appendix instructs you on how to use the Linksys QuickVPN software if you are using a Windows 2000 or
XP PC.
. • Appendix C: Configuring a Gateway-to-Gateway IPSec Tunnel This appendix describes
how to configure an IPSec VPN Tunnel between two VPN Routers.
. • Appendix D: Finding the MAC Address and IP Address for your Ethernet Adapter. This
appendix describes how to find the MAC address for your computer’s Ethernet adapter so you can use the
MAC filtering and/or MAC address cloning feature of the Router. It also explains how to find the IP
address for your computer.
. • Appendix E: Glossary This appendix gives a brief glossary of terms frequently used in
networking.
. • Appendix F: Specifications This appendix provides the technical specifications for the
Router.
. • Appendix G: Warranty Information This appendix supplies the warranty information for
the Router.
. • Appendix H: Regulatory Information This appendix supplies the regulatory information
regarding the Router.
. • Appendix I: Contact Information This appendix provides contact information for a
variety of Linksys resources, including Technical Support.
Chapter 2: Networking and Security
Basics
An Introduction to LANs
A Router is a network device that connects
multiple networks together and forward traffic
based on IP destination of each packet.
The Wireless-N Gigabit Security Router can connect your local area network (LAN) or a group of PCs
interconnected in your home or office to the Internet. You can use one public IP address from the ISP
through WAN port and use the router’s Network Address Translation (NAT) technology to share this single
IP address
among all the users.
ddresses of a local area network to a The Router’s Network Address Port Translation (NAPT or NAT)
technology protects your network of PCs so users different IP address for the Internet. on the Internet
cannot “see” your PCs. This is how your LAN remains private. The Router protects your network by
inspecting the first packet coming in through the Internet port before delivery to the final destination on one
of the Ethernet ports. The Router inspects Internet port services like the web server, ftp server, or other
Internet
appropriate PC on the LAN side.
NAT (Network Address Translation):
NAT technology translates IP
LAN: the computers and networking products that
make up your local network
applications, and, if allowed, it will forward the packet to the
a
Multiple Wireless-N Gigabit Security Routers can also be used to connect multiple LANs
together. This usually a p plies to a medium-sized or larger company where you want to
divide your network into multiple IP subnets to increa se the intra ne t t hro u gh p ut a n d
reduce the size of the IP broadcast domain and its interference. In this case, you need one
WRVS4400Nv2 for each subnetwork and you can connect all the WAN ports to a second
level Router or switch to the Internet. Note that the second level Router only forward s
data packets through a wire d ne twork so you don’t have to use the Wireless-N Gigab it
Security Router. You can use any wired router in the Linksys family, e.g. RVS4000,
which has 4 LAN ports and 1 WAN port.
The following diagram shows an example that consists of two levels of routers and
multiple LANs inter-connected together. The wireless network is only available at the
first level of router to provide end user connections. The second level router can connect
to dedicated Server PCs or routers that aggregates traffic from different LANs.
The Use of IP Addresses
IP stands for Internet Protocol. Every device in an IP-based network, including PCs, print servers, and
routers, requires an IP address to identify its location, or address, on the network. This applies to both the
Internet and LAN connections.
There are two ways of assigning IP addresses to your network devices.
NOTE: Since the Router is a device that connects two networks, it needs two IP addresses—one for the
LAN, and one for the Internet. In this User Guide, you’ll see references to the “Internet IP address” and the
“LAN IP address.”
Since the Router uses NAT technology, the only IP address that can be seen from the Internet for your
network is the Router’s Internet IP address. However, even this Internet IP address can be hidden on the
Internet by suppressing PING response.
A static IP address is a fixed IP address that you assign manually to a PC or other device on the network.
Since a static IP address remains valid until you disable it, static IP addressing ensures that the device
assigned it will always have that same IP address until you change it. Static IP addresses are commonly
used with dedicated network devices such as server PCs or print servers. Since a user’s PC is moving
around in a network and is being powered on or off, it does not require a dedicated IP address that could be
a precious resource in your network.
If you use the Router to share your cable or DSL Internet connection, contact your ISP to find out if
they have assigned a static IP address to your account. If so, you will need that static IP address when
configuring the Router. You can get the information from your ISP.
A dynamic IP address is automatically assigned to a device on the network. This IP address is called
dynamic because it is only temporarily assigned to the PC or other device. After a certain time period, it
expires and may change. If a PC logs onto the network (or the Internet) and its dynamic IP address has
expired, the DHCP server will assign it a new dynamic IP address. Most ISPs use dynamic IP addresses for
their customers. By default, the Router’s Internet Connection Type is Obtain an IP automatically
(DHCP).
For DSL users, many ISPs may require you to log on with a user name and password to gain access to the
Internet. This is a dedicated, high-speed connection type called Point-to-Point Protocol over Ethernet
(PPPoE). PPPoE is similar to a dial-up connection, which establishes a PPP session with an ISP server
through the DSL connection. The server will also provide the Router with a dynamic IP address to
establish a connection to the Internet.
A DHCP server can either be located on a designated PC on the network or another network device, such as
the Router. The PC or network device obtaining an IP address is called the DHCP client. DHCP frees you
from having to assign IP addresses manually every time a new user is added to your network. For this
Wireless-N Router, a DHCP client is running on a WAN port for most configurations. A DHCP server is
running on the LAN side to provide services.
By default, a DHCP server is enabled on the Router. If you already have a DHCP server running on your
network, you MUST disable one of the two DHCP servers. If you run more than one DHCP server on your
network, you will experience network errors, such as conflicting IP addresses. To disable DHCP on the
Router, refer to the Basic Setup section in “Chapter 6: Setting Up and Configuring the Router.”
Static IP address: a fixed address assigned to a computer or device that is connected to a network.
Dynamic IP address: a temporary IP address assigned by a DHCP server.
DHCP (Dynamic Host Configuration Protocol): a protocol that lets one device on a local network, known
as a DHCP server, assign temporary IP addresses to the other network devices, typically computers.
IPS is an advanced technology to protect your network from malicious attacks. IPS works together with
your SPI Firewall, IP Based Access List (IP ACL), Network Address Port Translation (NAPT), and Virtual
Private Network (VPN) to achieve the highest amount of securities.
IPS works by providing real-time detection and prevention as an in-line module in a router. The Wireless-N
Security Router has hardware-based acceleration for real-time pattern matching for malicious attacks. It
actively filters and drops malicious TCP/UDP/ICMP/IGMP packets and can reset TCP connections. This
protects your client PCs and servers running various operating systems including Windows, Linux, and
Solaris from network worm attacks. However, this system does not prevent viruses attached emails.
The signature file is the heart of the IPS system. It is similar to the Virus definition files on your PC’s
Anti-Virus programs. IPS uses this file to match against packets coming in to the Router and performs
actions accordingly. As of today, the Wireless-N Router is shipped with signature file version 1.1.4 and
with a total of 1048 rules. The rules cover the following categories: DDoS, Buffer Overflow, Access
Control, Scan, Trojan Horse, Misc., P2P, IM, Virus, Worm, and Web Attacks.
Customers are encouraged to update their IPS signature file regularly to prevent any new type of attacks
on the Internet.
Chapter 3: Planning Your Virtual
Private Network (VPN)
Why do I need a VPN?
Computer networking provides a flexibility not available when using an archaic, paper-based system. With
this flexibility, however, comes an increased risk in security. This is why firewalls were first introduced.
Firewalls help to protect data inside of a local network. But what do you do once information is sent
outside of your local network, when e-mails are sent to their destination, or when you have to connect to
your company's network when you are out on the road? How is your data protected?
That is when a VPN can help. VPNs are called Virtual Private Networks because they secure data moving
outside of your network as if it were still within that network.
When data is sent out across the Internet from your computer, it is always open to attacks. You may already
have a firewall, which will help protect data moving around or held within your network from being
corrupted or intercepted by entities outside of your network, but once data moves outside of your
network—when you send data to someone via e-mail or communicate with an individual over the
Internet—the firewall will no longer protect that data.
At this point, your data becomes open to hackers using a variety of methods to steal not only the data you
are transmitting but also your network login and security data. Some of the most common methods are as
follows:
1) MAC Address Spoofing
Packets transmitted over a network, either your local network or the Internet, are preceded by a packet
header. These packet headers contain both the source and destination information for that packet to transmit
efficiently. A hacker can use this information to spoof (or fake) a MAC address allowed on the network.
With this spoofed MAC address, the hacker can also intercept information meant for another user.
2) Data Sniffing
Data “sniffing” is a method used by hackers to obtain network data as it travels through unsecured
networks, such as the Internet. Tools for just this kind of activity, such as protocol analyzers and network
diagnostic tools, are often built into operating systems and allow the data to be viewed in clear text.
3) Man in the middle a ttacks
Once the hacker has either sniffed or spoofed enough information, he can now perform a “man in the
middle” attack. This attack is performed, when data is being transmitted from one network to another, by
rerouting the
vpn (virtual private network): a security measure to protect data as it leaves one network and goes to
another over the Internet
packet: a unit of data sent over a network
These are only a few of the methods hackers use and they are always developing more. Without the
security of your VPN, your data is constantly open to such attacks as it travels over the Internet. Data
travelling over the Internet will often pass through many different servers around the world before
reaching its final destination. That's a long way to go for unsecured data and this is when a VPN serves its
purpose.
What is a VPN?
A VPN, or Virtual Private Network, is a connection between two endpoints—a VPN Router, for
instance—in different networks that allows private data to be sent securely over a shared or public
network, such as the Internet. This establishes a private network that can send data securely between
these two locations or networks.
This is done by creating a “tunnel”. A VPN tunnel connects the two PCs or networks and allows data
to be transmitted over the Internet as if it were still within those networks. Not a literal tunnel, it is a
connection secured by encrypting the data sent between the two networks.
There are two popular ways to establish a secured tunnel over the Internet — IPsec (IP Security) and SSL
(Secure Sockets Layer). IPsec runs on top of the IP layer and SSL runs over HTTP sessions. IPsec provides
better data throughput and SSL offers ease of use without the need of VPN client applications. The
Wireless-N Gigabit Security Router supports IPsec VPN for maximum throughput on data security.
VPN was created as a cost-effective alternative to using a private, dedicated, leased line for a private
network. Using industry standard encryption and authentication techniques—IPsec, short for IP
Security—the VPN creates a secure connection that, in effect, operates as if you were directly connected to
your local network. Virtual Private Networking can be used to create secure networks linking a central
office with branch offices, telecommuters, and/or professionals on the road (travelers can connect to a VPN
Router using any computer
encryption: encoding data transmitted in a network ip (internet protocol): a protocol used to send data
over a network software: instructions for the computer
. • VPN Router to VPN Router
. • Computer (using the Linksys VPN client software) to VPN Router
The VPN Router creates a “tunnel” or channel between two endpoints, so that data
transmissions between them are secure. A computer with the Linksys VPN client
software can be one of the two endpoints (refer to “Appendix
C: Using the Linksys QuickVPN Software for Windows 2000 or XP”). If you choose not
to run the VPN client sof t ware , any computer with the built-in IPsec Security Manager
(Microsoft 2000 and XP) allows the VPN Router
VPN Router to VPN Router
An example of a VPN Router-to-VPN Router VPN would be as follows. At home, a telecommuter uses his
VPN Router for his always-on Internet connection. His router is configured with his office's VPN settings.
When he connects to his office's router, the two routers create a VPN tunnel, encrypting and decrypting
data. As VPNs utilize the Internet, distance is not a factor. Using the VPN, the telecommuter now has a
secure connection to the central office's network, as if he were physically connected. For more information,
refer to “Appendix C: Configuring a Gateway-to-Gateway IPsec Tunnel.”
Computer (using the Linksys VPN client software ) to VPN Router
The following is an example of a computer-to-VPN Router VPN. In her hotel room, a traveling
businesswoman dials up her ISP. Her notebook computer has the Linksys VPN client software, which is
configured with her office's IP address. She accesses the Linksys VPN client software and connects to the
VPN Router at the central office. As VPNs utilize the Internet, distance is not a factor. Using the VPN, the
businesswoman now has a secure connection to the central office's network, as if she were physically
connected.
For additional information and instructions about creating your own VPN, please visit Linksys’s website at
www.linksys.com. You can also refer to “Appendix B: Using the Linksys QuickVPN Software for
Windows 2000 or XP” and “Appendix C: Configuring a Gateway-to-Gateway IPsec Tunnel.”
Home Office
Off-site
PC 1
WRVS4400Nv2
Office
WRVS4400Nv2 PC 2
VPN Router PC 2
Laptop running Linksys VPN Client Software
Chapter 4: Getting to Know the
Router
The Front Panel
The Router’s LEDs are located on the front panel of the Router.
LEDs
POWER Green. The POWER LED lights up when the Router is powered on. The LED
flashes when the Router runs a diagnostic test.
IPS
WIRELESS Green. The WIRELESS LED lights up when the wireless module is enabled. The
1-4 (ETHERNET) Green. For each port, there are three LEDs. If the corresponding LED is
Green/Red. The
light is off when the IPS functions are disabled. The IPS LED flashes green when
an external attack is detected. The IPS LED flashes red when an internal attack is
detected.
LED is off when the wireless module is disabled. The WIRELESS LED flashes
green when the data is transmitting or receiving on the wireless module.
continuously lit, the Router is connected to a device at the speed indicated through
the corresponding port (1, 2, 3, or 4). The LED flashes when the Router is actively
LED lights up when the IPS function is enabled. The LED
IPS
sending or receiving data.
INTERNET Green. The INTERNET LED lights up the appropriate LED depending upon the
speed of the device that is attached to the Internet port. If the Router is connected
to a cable or DSL modem, typically the 10 LED will be the only LED lit up (i.e.
10Mbps). The LED Flashes during activity.
Figure 4-2: Back Panel
The Reset button can be used in one of two ways:
If the Router is having problems connecting to the Internet, press the Reset button
for just a second with a paper clip or a pencil tip. This is similar to pressing the
Reset button on your PC to reboot it.
If you are experiencing extreme problems with the Router and have tried all other
troubleshooting measures, press and hold in the Reset button for 10 seconds. This
will restore the factory defaults and clear all of the Router’s settings, such as port
Reset Button
Ports
INTERNET
1-4
(ETHERNET)
POWER
forwarding or a new password.
The INTERNET port connects to a cable or DSL modem.
The four ETHERNET ports connect to network devices, such as PCs, print servers,
or additional switches.
The POWER port is where you will connect the included AC power cable.
The Access Point can be placed in three different positions. It can be either stackable,
standalone, or wall-mount.
Antenna The Access Point has three non -detachable 1.8dBi omni-directional
antennas. The three antennas have a base that can rotate 90 degrees
when in the standing position. The three antennas will all be used to
support 2X3 MIMO diversity in wireless-N mode.
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