How to Create Classic VPNs on Google Cloud Platform.

Classic VPN gateways have a single interface, a single external IP address, and support tunnels that use dynamic (BGP) or static routing (policy-based or route-based). They provide an SLA of 99.9% service availability.

With Classic VPN, your on-premises hosts communicate through one or more IPsec VPN tunnels to Compute Engine virtual machine (VM) instances in your project’s Virtual Private Cloud (VPC) networks. Classic VPN supports site-to-site VPN as the simple topology shown on this page or with redundancy options.

 

  • Login to google cloud platform portal.
  • Click on Hybrid connectivity.
  • Select VPN.

 

Fig 1

 

  • Click on Create VPN connection.

 

Fig 2

 

  • Select Classic VPN.
  • Click on continue.

 

Fig. 3

 

  • Provide VPN gateway name.
  • Select Existing Network.
  • Select Region.
  • Click on IP address.

 

Fig. 4

 

  • Click on Create IP address.

 

Fig. 5

 

  • Provide the static IP address name.
  • Click on Reserve.

 

Fig. 6

 

  • Provide VPN tunnel name.
  • Provide Remote peer (external IP address)IP address.
  • Select IKE version: IKEv1 or IKEv2(Default).
  • Click on Generate & copy for IKE pre-shared key.

 

Fig. 6

 

  • Select Dynamic Routing options.
  • Click on Cloud Router.
  • Select Existing or Create a new cloud router.

 

Fig 7

 

  • Provide Router name.
  • Select Existing network.
  • Select Region.
  • Provide Google ASN between (64512 – 65534, 4200000000 – 4294967294) that you are not using elsewhere in your network.
  • Click on Create.

 

Fig 9

 

  • At Dynamic routing click on BGP session.
  • Provide BGP session name.
  • Provide Peer ASN configured for the peer VPN gateway.
  • Provide a value/number for route priority.
  • Provide Cloud Router BGP IP & BGP peer IP.
  • Click on Save & continue.

 

Fig 10

 

  • At Route-Based, provide Remote network IP range.
  • Click on Done.

 

Fig 11

 

  • At Policy-Based provide remote network IP range & Local IP range.
  • Click on Done.
  • If you need to create more tunnels on the same gateway, click Add tunnel and repeat the previous step. You can also add more tunnels later.
  • Click on Create.

 

Fig 12

 

  • After sometime VPN is ready then go to VPN  tunnel home page.
  • Classic VPN tunnel is there with the name we provide.

Fig 12

 

Create VPN using Shell.

 

Fig 14

 

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