Edge node tunnel connectivity down due to connection issues with Host TEP.

Products

• VMware NSX

Issue/Introduction

• Tunnel connectivity is reported as down on NSX Edge nodes.
• Communication between the Host Tunnel Endpoint (TEP) and Edge TEP fails, resulting in packet loss during ping tests between these endpoints.
• This issue occurs when the TEPs are on different subnets and routing is not properly established.

Environment

VMware Cloud Foundation (VCF) 9.x

VMware NSX 

Cause

• This can be caused due to misconfiguration in the NSX IP address pool where the TEP gateway is missing.
• Without a defined gateway, TEP traffic cannot be routed across different subnets between the Host and Edge nodes.

Resolution

To restore connectivity, you must ensure the IP address pool associated with your TEPs includes the correct gateway and that the physical network supports the routing.

1. Log in to the NSX Manager UI.

2. Navigate to the IP Address Pools configuration.

3. Edit the IP pool associated with the TEPs (e.g., the pool used by the Host or Edge transport nodes).

4. Ensure the Gateway IP is correctly assigned to the pool.

5. Verify with your physical networking team that proper routing is in place for the TEP network to allow communication between Host TEP and Edge TEP subnets.

Additional Information

For detailed steps on configuring IP pools, refer to the official documentation: Create an IP Pool for Tunnel Endpoint IP Addresses