10.Go to the IP Filter List tab, and click the filter list
11.Click the Filter Action tab, and select the filter action Require Security, as shown in Figure
12.Click the Authentication Methods tab, and verify that the authentication method Kerberos is selected, as shown in Figure
Appendix C: Configuring IPSec between a Windows 2000 PC and the Router
Figure C-19: IP Filter List Tab
Figure C-20: Filter Action Tab
Figure C-21: Authentication Methods Tab
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How to Establish a Secure IPSec Tunnel