Cloud VPN

Specifications

Under the conditions stated in this section, Cloud VPN only allows site-to-site IPsec VPN communication. The client-to-gateway situations are not supported. To put it another way, Cloud VPN does not allow use cases where client PCs must "call in" to a VPN using client VPN software.

Only IPsec is supported by cloud VPN. Other VPN technologies are not supported, including SSL VPN.

The traffic from the following Cloud VPN servers stays on the Google production network

• one HA VPN gateway and another
• two Classic VPN gateways together
• between a Classic VPN gateway and a Compute Engine VM operating as a VPN gateway's external IP address

A peer VPN gateway or another cloud VPN gateway must be connected to each cloud VPN gateway.

An external (internet routable) static IPv4 address is required for the peer VPN gateway. In order to set up Cloud VPN, you require this IP address.

Network bandwidth

Ingress and egress traffic over each Cloud VPN connection may support up to 3 gigabits per second (Gbps).

Sent bytes and Received bytes, which are discussed under View logs and metrics, are the metrics associated with this limit. Remember that the measurements are measured in bytes, but the 3-Gbps limit is measured in bits per second. The maximum speed, expressed in bytes, is 375 megabytes per second (MBps). Use the sum of sent and received bytes in comparison to the converted limit of 375 MBps when calculating use in relation to the cap.

Tunnel MTU

The MTU for cloud VPN is always 1460 bytes. Cloud VPN uses MSS clamping to lower the TCP MTU setting to 1460 in the event that the VMs and networks on either side of the tunnel have higher MTUs. The VPN gateways can additionally enable path MTU discovery (PMTUD) via ICMP error messages, which lowers the MTU for UDP packets.

You can decrease the MTU of the particular VMs that are utilising the tunnel for communication if UDP packets are being dropped. Lowering the MTU is adequate for user-supplied images and Windows virtual machines. Additionally, you need to turn off DHCP MTU updates for those VMs using the Linux images that Google provides.

IPV6 Support

In contrast to Classic VPN, Cloud VPN does not support IPv6.

In order to link IPv6-enabled VPC networks with other IPv6-enabled networks, you can build HA VPN gateways and tunnels. On-premises networks, multi cloud networks, or other VPC networks can be included in these networks. Your IPv6-enabled VPC networks must have dual-stack subnets in order to carry IPv6 traffic in your HA VPN tunnels. Additionally, internal IPv6 ranges must be assigned to the subnets.

HA VPN tunnels only allow for regional IPv6 traffic routing. Within the region designated to the HA VPN gateway, IPv6 traffic is routed. In HA VPN tunnels, global routing for IPv6 traffic is not supported.

Visualizing and monitoring Cloud VPN connections

A visualisation tool called Network Topology displays the topology of your VPC networks, hybrid connections to and from your on-premises networks, as well as the related metrics. In the Network Topology view, you can see your VPN tunnels and Cloud VPN gateways as separate entities.

A base entity, which represents a resource that may directly communicate with other resources across a network, is the lowest level of a specific hierarchy. By combining base things, Network Topology creates hierarchical entities that you can extend or collapse. A Network Topology graph collects all the base entities into their top-level hierarchy when you first view it.

Frequently asked questions

What Is A VPN, or Virtual Private Network?

A VPN is "an encrypted connection from one point to another across any network that gives the appearance of being a private network," according to the definition of the term. 

What Resources (people, computing power, bandwidth, etc.) Are Necessary For VPN Deployment, Usage, and Maintenance?

The network or system administrator personnel generally treats VPNs as if they were just another task. Since most VPN installations only need setting up a VPN once, whoever is currently managing the firewall can easily expand their responsibilities to include VPN management.

What Connection Exists Between Firewalls And VPN?

While VPNs were accessible before firewalls through routers and modems that encrypt data, they became widely used on or in conjunction with firewalls. Nowadays, the majority of customers would anticipate a VPN option from a firewall manufacturer. (Although the majority of people today don't utilise VPNs.) They also want the same firewall administration interface to be used for management. However, consumers today appear to want almost everything on the firewall, including mail servers, name servers, HTTP proxy servers, FTP servers, directory servers, and others. 

Are There Any Use Cases Or Environments Where VPNs Would Actually Be Harmful?

Just the conversations you want everyone to be able to listen in on. In general, the answer is "no," however if a VPN is being used between a system that is protected by a firewall and a system that is not, the firewall cannot enforce an organization's security policy beyond connection rules.

Is VPN a long-term solution or a quick stopgap measure?

VPNs are a sustainable option. Although VPNs may become commonplace and obvious to the user, they won't disappear. Because the issue that VPNs try to solve, namely privacy over a public network, is here to stay. From the desktop to the server, and at both the IP packet level and the application data level, VPNs will be available.

Conclusion

In this article, we learned about the cloud VPN and also the specifications that are necessary to run a VPN in google. We also learned about the types of Cloud VPN in Google cloud and comparison between.

For more cloud related information you can refer to the following articles:

Cloud APIs

Cloud DNS

Google Cloud Console

Cloud Domains

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