Create outbound rule configuration

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In this we will learn about Load balancer outbound rules configure outbound SNAT for VMs in the backend pool.

However, a public IP or prefix can be used for the outbound configuration.

Public IP

Use az network public-ip create to create a single IP for the outbound connectivity.

• Firstly, Named myPublicIPOutbound.
• Secondly, In CreatePubLBQS-rg.

Azure CLI:
az network public-ip create \
–resource-group CreatePubLBQS-rg \
–name myPublicIPOutbound \
–sku Standard

To create a zonal redundant public IP address in Zone 1:

Azure CLI:
az network public-ip create \
–resource-group CreatePubLBQS-rg \
–name myPublicIPOutbound \
–sku Standard \
–zone 1

Public IP Prefix

Use az network public-ip prefix create to create a public IP prefix for the outbound connectivity.

• Firstly, Named myPublicIPPrefixOutbound.
• Secondly, In CreatePubLBQS-rg.
• Lastly, Prefix length of 28.

Azure CLI:
az network public-ip prefix create \
–resource-group CreatePubLBQS-rg \
–name myPublicIPPrefixOutbound \
–length 28

However, to create a zonal redundant public IP prefix in Zone 1:

Azure CLI:
az network public-ip prefix create \
–resource-group CreatePubLBQS-rg \
–name myPublicIPPrefixOutbound \
–length 28 \
–zone 1

Create outbound frontend IP configuration

Create a new frontend IP configuration with az network lb frontend-ip create :

Firstly, Select the public IP or public IP prefix commands based on decision in previous step.

Public IP

• Firstly, Named myFrontEndOutbound.
• Secondly, In resource group CreatePubLBQS-rg.
• Thirdly, Associated with public IP address myPublicIPOutbound.
• Lastly, Associated with load balancer myLoadBalancer.

Azure CLI:

az network lb frontend-ip create \
–resource-group CreatePubLBQS-rg \
–name myFrontEndOutbound \
–lb-name myLoadBalancer \
–public-ip-address myPublicIPOutbound

Public IP prefix

• Firstly, Named myFrontEndOutbound.
• Secondly, In resource group CreatePubLBQS-rg.
• Thirdly, Associated with public IP prefix myPublicIPPrefixOutbound.
• Lastly, Associated with load balancer myLoadBalancer.

Azure CLI:
az network lb frontend-ip create \
–resource-group CreatePubLBQS-rg \
–name myFrontEndOutbound \
–lb-name myLoadBalancer \
–public-ip-prefix myPublicIPPrefixOutbound

Create outbound pool

Create a new outbound pool with az network lb address-pool create:

• Firstly, Named myBackEndPoolOutbound.
• Secondly, In resource group CreatePubLBQS-rg.
• Lastly, Associated with load balancer myLoadBalancer.

Azure CLI:
az network lb address-pool create \
–resource-group CreatePubLBQS-rg \
–lb-name myLoadBalancer \
–name myBackendPoolOutbound

Create outbound rule

Create a new outbound rule for the outbound backend pool with az network lb outbound-rule create:

• Firstly, Named myOutboundRule.
• Secondly, In resource group CreatePubLBQS-rg.
• Thirdly, Associated with load balancer myLoadBalancer
• Fourthly, Associated with frontend myFrontEndOutbound.
• Then, Protocol All.
• Idle timeout of 15.
• After that, 10000 outbound ports.
• Lastly, Associated with backend pool myBackEndPoolOutbound.

Azure CLI:

az network lb outbound-rule create \
–resource-group CreatePubLBQS-rg \
–lb-name myLoadBalancer \
–name myOutboundRule \
–frontend-ip-configs myFrontEndOutbound \
–protocol All \
–idle-timeout 15 \
–outbound-ports 10000 \
–address-pool myBackEndPoolOutbound

Add virtual machines to outbound pool

Add the virtual machines to the outbound pool with az network nic ip-config address-pool add:

• Firstly, In backend address pool myBackEndPoolOutbound.
• Secondly, In resource group CreatePubLBQS-rg.
• Lastly, Associated with load balancer myLoadBalancer.

Azure CLI:
array=(myNicVM1 myNicVM2 myNicVM3)
for vmnic in “${array[@]}”
do
az network nic ip-config address-pool add \
–address-pool myBackendPoolOutbound \
–ip-config-name ipconfig1 \
–nic-name $vmnic \
–resource-group CreatePubLBQS-rg \
–lb-name myLoadBalancer
done

Reference: Microsoft Documentation

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