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Chapter 1: Introduction
What’s in this Guide?
Wireless-N Gigabit Security Router with VPN
•
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.
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Chapter 2: Networking and Security Basics
An Introduction to LANs
Wireless-N Gigabit Security Router with VPN
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.
The Router’s Network Address Port Translation (NAPT or NAT) technology protects your network of PCs so users
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
applications, and, if allowed, it will forward the packet to the appropriate PC on the LAN side.
Multiple Wireless-N Gigabit Security Routers can also be used to connect multiple LANs together. This usually
applies to a medium-sized or larger company where you want to divide your network into multiple IP subnets to
increase the intranet throughput and reduce the size of the IP broadcast domain and its interference. In this case,
you need one WRVS4400N 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 forwards data packets through a wired network
so you don’t have to use the Wireless-N Gigabit 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.
NAT (Network Address Translation)
:
NAT technology translates IP
addresses of a local area network to a
different IP address for the Internet.
LAN
: the computers and networking products that
make up your local network
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Chapter 2: Networking and Security Basics
The Use of IP Addresses
Wireless-N Gigabit Security Router with VPN
Figure 2-1: Example network
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.
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Chapter 2: Networking and Security Basics
The Use of IP Addresses
Wireless-N Gigabit Security Router with VPN
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.”
Dynamic IP address
: a temporary IP
address assigned by a DHCP server.
Static IP address
: a fixed address
assigned to a computer or device that
is connected to a network.
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.
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Chapter 2: Networking and Security Basics
The Intrusion Prevention System (IPS)
Wireless-N Gigabit Security Router with VPN
The Intrusion Prevention System (IPS)
Figure 2-2: IPS Scenarios
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.
1000+
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