Manual Linksys BEFSX41 (page 13 of 43) (English)

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Chapter 2

Advanced Configuration

Broadband Firewall Router with 4-Port Switch/VPN Endpoint

IP Address If you select IP Address, only the computer

with the specific IP Address that you enter will be able to

access the tunnel.

IP Range If you select IP Range, it will be a combination

of Subnet and IP Address. You can specify a range of IP

Addresses within the Subnet which will have access to the

tunnel.

The next two options are for Remote Secure Groups only.

Host If you select Host for the Remote Secure Group,

then the Remote Secure Group will be the same as the

Remote Security Gateway setting: IP Address, FQDN (Fully

Qualified Domain Name), or Any.

Any If you select Any for the Remote Security Group, the

local VPN Router will accept a request from any IP address.

This setting should be chosen when the other endpoint is

using DHCP or PPPoE on the Internet side.

Remote Security Gateway

The Remote Security Gateway is the VPN device, such as a

second VPN Router, on the remote end of the VPN tunnel.

Under Remote Security Gateway, you have three options:

IP Address, FQDN, and Any. In this section, you can also

set the levels and types of encryption and authentication.

IP Address If you select IP Address, enter the IP Address of

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

VPN device can be another VPN Router, 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.

Remember, this is NOT the IP Address of the local VPN

Router, but the IP Address of the remote VPN Router or

device with which you wish to communicate.

FQDN (Fully Qualified Domain Name) If you select

FQDN, enter the FQDN of the VPN device at the other

end of the tunnel. The remote VPN device can be another

VPN Router, a VPN Server, or a computer with VPN client

software that supports IPSec. The FQDN is the host name

and domain name for a specific computer on the Internet,

for example, vpn.myvpnserver.com.

Any If you select Any for the Remote Security Gateway,

the VPN device at the other end of the tunnel will accept

a request from any IP address. The remote VPN device can

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

VPN client software that supports IPSec. If the remote

user has an unknown or dynamic IP address (such as a

professional on the road or a telecommuter using DHCP

or PPPoE), then Any should be selected.

Encryption Using Encryption also helps make your

connection more secure. There are two different types of

encryption: DES 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 and

SHA (SHA is recommended because it is more secure). As

with encryption, either of these may be selected, provided

that 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.

Key Management

In order for any encryption to occur, the two ends of the

tunnel must agree on the type of encryption and the way

the data will be decrypted. This is done by sharing a “key”

to the encryption code. Under Key Management, you may

choose automatic or manual key management.

Automatic Key Management Select Auto (IKE) and enter

a series of numbers or letters in the Pre-shared Key field.

Check the box next to PFS (Perfect Forward Secrecy) to

ensure that the initial key exchange and IKE proposals are

secure. Based on this word, which MUST be entered at both

ends of the tunnel if this method is used, a key is generated

to scramble (encrypt) the data being transmitted over the

tunnel, where it is unscrambled (decrypted). You may use

any combination of up to 24 numbers or letters in this

field. No special characters or spaces are allowed. In the

Key Lifetime field, you may optionally select to have the key

expire at the end of a time period of your choosing. Enter

the number of seconds you’d like the key to be useful, or

leave it blank for the key to last indefinitely.

Manual Key Management Similarly, you may choose

Manual keying, which allows you to generate the key

yourself. Enter your key into the Encryption KEY field.

Then enter an Authentication KEY into that field. These

fields must both match the information that is being

entered in the fields at the other end of the tunnel. Up

to 24 alphanumeric characters are allowed to create the

Encryption Key. Up to 20 alphanumeric characters are

allowed to create the Authentication Key.

The Inbound SPI and Outbound SPI fields are different,

however. The Inbound SPI value set here must match the

Outbound SPI value at the other end of the tunnel. The

Outbound SPI here must match the Inbound SPI value at

the other end of the tunnel. That is, the Inbound SPI and

Outbound SPI values would be opposite on the other end

of the tunnel. Only numbers can be used in these fields.

After you click the Save Settings button, hexadecimal

characters (series of letters and numbers) are displayed in

the Inbound SPI and Outbound SPI fields.

The Status field at the bottom of the screen will show

when a tunnel is active.

To connect a VPN tunnel, click the Connect button.

The View Logs button, when logging is enabled on the

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Linksys BEFSX41 Manual

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