Does ZyWALL support dynamic secure gateway IP?
If the remote VPN gateways uses dynamic IP, we enter 0.0.0.0 as the Secure Gateway IP Address in ZyWALL. In this case, the VPN connection can only be initiated from dynamic side to fixed side in order to update its dynamic IP to the fixed side. However, if both gateways use dynamic IP addresses, it is no way to establish VPN connection at all.