Linksys WRV54G User Manual page 37

Wireless-G VPN Broadband Router
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.
• 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. In Figure 6-18, DES (which is the default) has been
selected.
• 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. In Figure 6-18, MD5 (the default) has been
selected.
• 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.
• Status. Click the Advanced VPN Tunnel Setup key and the Advanced VPN Tunnel Setup screen will appear.
See Figure 6-19.
When finished making your changes on this tab, click the Save Settings button to save these changes, or click
the Cancel Changes button to undo your changes.
Chapter 6: Configuring the Router
The Security Tab
32