Error: "Subnets 192.168.255.###/2# and 192.168.255.225/27 are overlapping." when configuring a routed network

Products

• VMware Cloud Director

Issue/Introduction

When configuring a new VMware Cloud Director (VDC) with an edge and a internal routed network you get an error similar to [ ########-####-####-####-############] Subnets 192.168.255.###/2# and 192.168.255.225/27 are overlapping.

 

 

Environment

VMware Cloud Director 10.x

Cause

In creating a new Edge Service Gateway via VMware Cloud Director, by default, "192.168.255.225/27" network is defined as a service network which DNS and DHCP service on an NSX-T edge will run on. After its creation this parameter can not be modified.

This parameter is set to default via GUI. As a result, other networks overlapping this IP address range cannot be created.

 

Resolution

This is a known issue affecting VMware Cloud Director.

 

You can create a new Edge Service Gateway via VCD API defining a different "serviceNetworkDefinition" parameter that doesn't overlap with the internal routed network.