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I'd like to use the Google Cloud VPN to establish connectivity between three office networks in different geographical locations. I'd like to be sure of a few things:

  1. Do I need a static IP or not?
  2. Do I need any special physical devices on premises i.e. router, firewall?
  3. In all three locations I have simple routers which are wireless/wired, so what kind of configs I will have to make to connect it to Google Cloud Platform as on-premise networks have Internet connectivity with dynamic public addresses which change, or can change. What will be the on-premise VPN gateway?
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The Google Cloud VPN product is used to establish a tunnel between your premise and the Google Cloud platform.

If you want to established betweens your offices, you need a VPN gateway and a static IP address on each site. Then you can create the three tunnels (site1/site2, site1/site3, site2/site3).

Another options is to have a central OpenVPN server with client-to-client option enabled. Then you can work with dynamic IP addresses but performances could be impacted.

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In order to create a Cloud VPN tunnel you need a gateway, so a virtual VPN gateway running in GCP managed by Google, using a configuration you specify in your project. Each Cloud VPN gateway is a regional resource using a regional external IP address.

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There are no special devices, however there are specific ciphers supported by GCP according to the IKE version.

Additionally, there is a list of interoperability guides for some vendors that can help you.

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At the beginning you need to create three tunnels, however it depends on your needs and the topology you want to have. Thus, please take a look at this document which has some examples of VPN topologies. Additionally, this link can help you to configure your VPN on-premise gateway.

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