ZyXEL Communications 2WG - Manual (Page 132)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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16. Select Negotiation Mode to Main mode, Encryption Algorithm to DES, Authentication
Algorithm to MD5, Key Group to DH1, and then press Apply button on this page.
17. You will see an IKE rule on your VPN page, press L/R button to edit your IPSec rule.