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The procedure to create a separate network without using VLAN is described in this Knowledge Base article.
2.2) Creating a separate network with the use of VLAN:
The procedure to create a separate network with the use of VLAN is described in this Knowledge Base article. The configuration steps regarding the Public Spot can be ignored.
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A collection of Knowledge Base documents which describe the configuratuion of IKEv2 VPN connections can be found in the master document Knowledge Base documents on VPN connections with IKEv2.