ZyXEL Communications 2WG - Manual (Page 191)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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4. On P1 proposal settings, select Encryption to DES, Authentication to MD5, and DH Group to
Group1. Then, press “-” button to delete the second P1 proposal rules.
5. To uncheck the Nat-traversal check box. And then press OK button to save the settings.