Linksys 2.4 GHz 802.11g Wireless-G ADSL Gateway with 2 Ports WAG54GP2 - Manual (Page 107)

99 Appendix C: Configuring IPSec between a Windows 2000 or XP Computer and the Gateway
How to Establish a Secure IPSec Tunnel
Wireless-G ADSL Gateway with 2 Phone Ports
4. Select the Authentication Methods tab, and click the Edit button.
5. Change the authentication method to Use this string to protect the key exchange (preshared key), and
enter the preshared key string, such as XYZ12345. Click the OK button.
6. This new Preshared key will be displayed. Click the Apply button to continue, if it appears on your screen,
otherwise proceed to the next step.
Figure C-13: Authentication Methods
Figure C-14: Preshared Key
Figure C-15: New Preshared Key