NAT Gateway Configuration for azure Internal load balancer

Question

I configured azure internal load balancer for azure vm scaleset. Both the resources are in different subnet of the same vnet. Now i want my vm instances in the scaleset to have the outbound connectivity to the internet.

I created the NAT gateway and associated to azure VM scaleset's subnet and configured the outbound rules on the nsg associated to subnet. This configuration works without any issue.

So then i wanted to test it by associating nat gateway to subnet of the Internal load balancer. this configuration is not working

Is there any reason why nat gateway isn't working in the load balancer's subnet?

Answer 1

@Gowda, Hariprasad
Is your Nat gateway bound to the same VNET as Load Balance?

I have a test environment, and the configuration is working; below are some screenshots:

My environment

VNET name LABTEST-vnet

Address space 10.0.0.0/16

Subnet##

Default = 10.0.0.0/24
Subnet02 = 10.0.1.0/24

Default Subnet ##

VM = 10.0.0.4
LB = 10.0.0.254
Nat Gateway attached

SUBNET Connected Devices ##

LOAD BALANCE Configuration ##

NAT GATEWAY ##

INTERNAL VM Behind LB##

I hope this information helps. Make a comparison between environments, and check which Subnet your Natgateway is linked to. Natgateway does not allow linking subnets with IP address Basic SKU, Load balance Basic SKU..

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