ZyXEL Communications 2WG - Manual (Page 45)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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address is assigned to ZyWALL’s WAN interface, ZyWALL will updates the related record in DDNS
server. Therefore the peer VPN gateway can resolve ZyWALL’s IP address to make a VPN tunnel.
In following example, local VPN gateway (ZyWALL) uses a dynamic WAN IP address (PPPoE with
dynamic IP assignment).