Cisco RV016 - Small Business - 10/100 VPN Router User's Guide download pdf (Page 16)

Chapter 2: Networking Basics

Why do I need a VPN?

10/100 16-Port VPN Router

A DHCP server can either be a designated PC on the network or another network device, such as the Router. By

default, the Router’s Internet Connection Type is Obtain an IP automatically (DHCP).

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 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, but PPPoE does not dial a phone number when establishing a

connection. It also will provide the Router with a dynamic IP address to establish a connection to the Internet.

By default, a DHCP server (on the LAN side) 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,

see the Basic Setup section in “Chapter 6: Setting up and Configuring the Router.”

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.

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 blocked, so that the

Router and network seem invisible to the Internet.

VPN (Virtual Private Network): A security

measure to protect data as it leaves one

network and goes to another over the Internet.

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