ZyXEL Communications 2WG - Manual (Page 187)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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6. In Authentication Key, enter the key string 12345678 in the Pre-Shared Key text box.
7. Select Negotiation Mode to Main mode, Encryption Algorithm to DES, Authentication
Algorithm to MD5, Key Group to DH1, and then click Apply button on this page.