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Port Address Translation (PAT)

Port Address Translation (PAT) allows multiple virtual machines in an environment to share the same outbound IP address. In SITE Cloud, PAT can be configured with a shared IP for shared-area access or a public IP for internet access.

Definition

PAT is configured at the environment level and then assigned to VMs that should use the translated IP for outbound traffic. This provides a consistent source IP when multiple VMs communicate with external networks.

Use Cases

Use case Description
Centralized outbound traffic Let multiple VMs connect to the same external service from a single IP address, simplifying logging and network management.
Controlled access zones Keep outbound traffic consistent when VMs access shared resources or public networks.
Cost-effective public IP use Reduce the number of public IP allocations by sharing one public IP across multiple VMs.

Step-by-Step Guide

Create a PAT

  1. Log in to Cloud Portal.
  2. Open the Environment page from the left menu.
  3. Find the environment where PAT should be configured.
  4. Open the row actions menu.
  5. Click Manage IPs.
  6. Select the PAT type.
  7. Select the IP address to use.
  8. Review the configuration.
  9. Apply the configuration.

The IP dropdown lists already allocated IP addresses.

Assign a PAT to a VM

  1. Open the VM details page.
  2. Open the Network tab.
  3. Click Manage IPs.
  4. Select the PAT that the VM should use for outgoing traffic.

Note

The PAT configuration becomes effective after it is applied.