What is Legacy Network? (2024)

It is now impossible to set up a legacy network, and doing so is not advised. Newer Google Cloud functionalities are often incompatible with older infrastructures. Make advantage of VPC networks, or Virtual Private Clouds. For legacy networks, the single RFC 1918 range is set at the time of network creation. The network’s reach is worldwide and includes all areas of the cloud.

IP addresses for instances are neither zone or region-specific on a legacy network. You may see an IP address in one area, then another IP address in a completely other location. The IP addresses of instances produced inside a region are not always contiguous, and any given range of IPs might be dispersed throughout all regions. In this model, a global switching function in the network (represented as a virtual switch) processes incoming data from the internet before distributing it to local instances. No IP address grouping is required for instances inside a region.

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ROUTES

The two routes present in a legacy network at startup are the default route to the Internet and the mobility route to the whole legacy network’s IP address range. Information on how to create routes may be found in the section Using Routes.

FIREWALL RULES

The default firewall rules for user-created networks are Allow-all for outgoing traffic and Deny-all for incoming traffic. For guidance on developing firewall rules, please refer to Use VPC firewall rules.

REPLACE LEGACY NETWORKS

See Migrating a VM across networks if you wish to relocate one or more VM instances away from your current network. Existing legacy networks may be converted to VPC networks in one of two ways:

1. Single-Region Conversion Tool: To convert just one area, use the gcloud or API. A standard network may be transformed into a virtual private cloud with this program. All Google Cloud legacy network resources must be in one area before the migration can begin. Failure of the migration occurs if the legacy network has resources in more than one area, such as suspended virtual machines. When the migration is complete, the new network’s subnet will have the same pool of available IP addresses on the internal network as the old one had. Once the migration is finished, you’ll have full access to VPC networks and their capabilities, including the ability to set up regional subnets. See Migrating a single-region legacy network to a virtual private cloud (VPC) for additional details on the migration.
2. Manual Migration: Create a virtual private cloud (VPC) replica of your existing network’s resources. How to migrate manually to a VPC network contains useful information.

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PREVIEW

By employing the one-region converter, you may go from a traditional network to a virtual private cloud built to your specifications. The IP address range of the legacy network is utilized to set up a subnet in the VPC network during the migration. All legacy network resources must be located in a single area for the conversion tool to function.

No service interruptions or other problems will arise as a result of using the tool to make the transition from a traditional network to a virtual private cloud (VPC). It is not possible to reverse back to a traditional experience of the network after converting to a VPC network, since the conversion is one-way.

In the event that your legacy network includes GKE clusters, you will need to update them once the migration is complete to guarantee the continued proper functioning of all GKE-dependent components. See Migrating GKE clusters from an existing network for further details.

The newly converted VPC network functions in the same way as any other VPC network. You have access to the VPC functionalities, including the capability to create additional subnets. New subnets must be constructed, however, from other legal ranges since the converted subnet shares the same internal IP address range as the whole legacy network.

LEGACY NETWORK

Instead of getting rid of the old network, it’s just been turned into a virtual private cloud. The IPv4 address space of the legacy network becomes the principal address space of a single subnet in a virtual private cloud.

There are key distinctions between traditional and virtual private cloud (VPC) networks.

1. The creation of legacy networks is currently impossible.
2. The IP address range of legacy networks is global and cannot be segmented. Virtual private cloud networks have subnets. One or more subnets of a VPC network may be located in each Google Cloud region.
3. One or more subnets may be created for each Google Cloud region in VPC networks. Using an older network, you cannot set up subnets for certain regions.
4. Not all older networks support the Google Cloud’s networking capabilities.

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