ZyXEL Communications 2WG - Manual (Page 171)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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27. If you have already done the previous settings, you should see a central gateway here. Select the
gateway, and then press OK button.
28. On Satellite Gateways settings, press Add button to add a remote gateway.