Question 191070 in Azure Question posted in
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InvalidCIDRNotation while creating Virtual Network in Azure

I use a bicep script to create a virtual network and 3 subnets

param vnetName string = 'vnet'

@description('The IP address range for virtual network')
param vnetAddressPrefix string = '10.201.0.0/16' //This value cannot be changed as it is used for deploying a containerApp

param subnetname string = 'subnet-app'
@description('The IP address space used for app subnet.')
param appSubnetAddressPrefix string = '10.201.0.0/23' //this subnet range cannot be changed as used for deploying containerApp

param privatesubnet string = 'subnet-pe'
@description('The IP address space used ')
param privatesubnetaddressprefix string = '10.201.1.0/23'

param assetsubnet string = 'subnnet-assets'
@description('The IP address space used for subnet asset.')
param assetsnet string = '10.201.2.0/23'

When i run the bicep file which should create 1 Virtual network and 3 subnets i get this
error.

"code": "InvalidTemplateDeployment", "message": "The template deployment 'exdeploy' is not valid according to the validation procedure. The tracking id is 'adfd-1e75eedfd40fa-32343-dderese1232'. See inner errors for details."}

Inner Errors: 
{"code": "InvalidCIDRNotation", "target": "/subscriptions/dysd/resourceGroups/mygrp/providers/Microsoft.Network/virtualNetworks/vnet-edersede", "message": "The address prefix 10.201.1.0/23 in resource /subscriptions/dysd/resourceGroups/mygrp/providers/Microsoft.Network/virtualNetworks/vnet-edersede/subnets/subnet-pe has an invalid CIDR notation. For the given prefix length, the address prefix should be 10.201.0.0/23."}

No resource gets created
Can anyone help here? Thanks

Tags:

2

Answers


  1. 0

    I created Bicep file in My Local and the below code is filled in this file.

    param location string = resourceGroup().location
resource vnet 'Microsoft.Network/virtualNetworks@2021-08-01' = {
  name: 'devvnet'
  location: resourceGroup().location
  properties: {
    addressSpace: {
      addressPrefixes: [
        '10.0.0.0/16'
      ]
    }
  }
}
resource subnet1 'Microsoft.Network/virtualNetworks/subnets@2021-08-01' = {
  parent: vnet
  name: 'subnet1'
  properties: {
    addressPrefix: '10.0.4.0/23'
    networkSecurityGroup: {
      id: nsg1.id
    }
  }
}

resource nsg1 'Microsoft.Network/networkSecurityGroups@2021-08-01' = {
  location: location
  name: 'nsg1'
}
    • The above code ran successfully. check the below image.
      enter image description here

    Result :
    enter image description here

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  2. 0

    Use any CIDR calculator(example).

    10.201.0.0/23 has a starting IP of 10.201.0.0 and ending IP of 10.201.1.255. So your subnet 2 of 10.201.1.0/23 is actually overlapping subnet 1.

    You can configure the following non-overlapping CIDRs for your subnets. This will work.

    Subnet 1 : 10.201.0.0/23

    Subnet 2 : 10.201.2.0/23

    Subnet 3 : 10.201.4.0/23

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