Cisco LINKSYS AG241 Kullanıcı Kılavuzu - Sayfa 11

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Chapter 2

The Security Tab > VPN

Virtual Private Networking (VPN) is a security measure

that creates a secure connection between two remote

locations. The Security > VPN screen allows you to configure

your VPN settings to make your network more secure.

Security > VPN

VPN Passthrough

IPSec Passthrough

Internet Protocol Security (IPSec) is a

suite of protocols used to implement secure exchange of

packets at the IP layer. To allow IPSec Passthrough, click

Enable. To disable IPSec Passthrough, click Disable.

PPTP Passthrough

Point-to-Point Tunneling Protocol

Passthrough is used to enable VPN sessions to a Windows

NT 4.0 or 2000 server. To allow PPTP Passthrough, click

Enable. To disable PPTP Passthrough, click Disable.

L2TP Passthrough

Layering 2 Tunneling Protocol

Passthrough is used to enable the operation of a VPN over

the Internet.To allow L2TP Passthrough, click Enable. To

disable L2TP Passthrough, click Disable.

IPSec VPN Tunnel

The VPN Gateway creates a tunnel or channel between

two endpoints, so that the data or information between

these endpoints is secure.

SubProduct

To establish this tunnel, select the tunnel you wish to

create in the Select Tunnel Entry drop-down box. It is

possible to create up to five simultaneous tunnels. Then

click Enabled to enable the IPSec VPN tunnel. Once the

tunnel is enabled, enter the name of the tunnel in the

Tunnel Name field. This is to allow you to identify multiple

tunnels and does not have to match the name used at the

other end of the tunnel. To delete a tunnel entry, select

the tunnel, then click Delete. To view a summary of the

settings, click Summary.

VPN Settings Summary

Local Secure Group and Remote Secure Group

The Local Secure Group is the computer(s) on your LAN

that can access the tunnel. The Remote Secure Group is

the computer(s) on the remote end of the tunnel that can

access the tunnel. These computers can be specified by a

Subnet, specific IP address, or range.

Local Security Gateway

Remote Security Gateway

The Remote Security Gateway is the VPN device, such as

a second VPN Gateway, on the remote end of the VPN

tunnel. Enter the IP Address or Domain of the VPN device

at the other end of the tunnel. The remote VPN device can

be another VPN Gateway, a VPN Server, or a computer with

VPN client software that supports IPSec. The IP Address

may either be static (permanent) or dynamic (changing),

depending on the settings of the remote VPN device. Make

sure that you have entered the IP Address correctly, or the

connection cannot be made. Note that this is NOT the IP

Address of the local VPN Gateway, but the IP Address of

the remote VPN Gateway or device with which you wish to

communicate. If you enter an IP address, only that specific

IP Address will be able to access the tunnel. If you select

Any, any IP Address can access the tunnel.

Encryption

Using Encryption also helps make your

connection more secure. There are two different types of

encryption: DES (default) or 3DES (3DES is recommended

because it is more secure). You may choose either of these,

but it must be the same type of encryption that is being

used by the VPN device at the other end of the tunnel. Or,

you may choose not to encrypt by selecting Disable.

Authentication

Authentication acts as another level

of security. There are two types of authentication: MD5

(default) and SHA (SHA is recommended because it is

more secure). As with encryption, either of these may be

selected, if the VPN device at the other end of the tunnel

is using the same type of authentication. Or, both ends of

the tunnel may choose to Disable authentication.

Configuration