Can I configure Same VIP with same subnet of VM on Same VPC?

jw.park 1

I want to use Load Balnacer.
Can I configure Same IP address range of VIP with Same IP Address Subnet on Same VPC?

for example,
VPC : test_vpc 192.168.0.0/16
Subnet : test_subnet 192.168.10.0/24
LB VIP : 192.168.10.3

is this possible??

2 answers

suvasara-MSFT 10,011 Reputation points

2022-02-04T05:11:30.083+00:00

@jw.park , Is your question towards Azure cloud or AWS? If Azure, then we have VNET concept here where you can create a subnet under it. You can select an address range for the VNET and can utilize it completely or can divide it into multiple subnets using subnetting theory. All these setups are for internal communication between Azure resources in same VNET. The communication stays on Azure backbone. So, Deploying Azure load balancer in to a VNET doesn't support here as it must be deployed with a public facing frontend configuration.
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jw.park 1 Reputation point

2022-02-04T05:37:20.84+00:00

So you mean azure doesn't support same ip range between VIP and VM. is this right?
How aboud AWS?
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jw.park 1 Reputation point

2022-02-04T05:37:06.88+00:00

So you mean azure doesn't support same ip range between VIP and VM. is this right?
How aboud AWS?
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suvasara-MSFT 10,011 Reputation points

2022-02-04T06:49:51.46+00:00

@jw.park , Here the network architecture in Azure,

Top Level: VNET --> Address Rage (192.168.0.0/16)
Subset of VNET: Subnet --> Can take complete prefix or can be divided into multiple subnets.
In the subnet you can deploy VM's (NIC) which take the private addresses from the subnet under which got deployed.

jw.park 1 Reputation point

2022-02-04T06:55:37.483+00:00

Thanks for your answer. I unterstood Azure Achitecture.

So In the Azure Cloud.
Can I deploy LB VIP's address with same ip address subnet?

SUBSET OF VNET : 192.168.10.0/24(if 2 vm, 192.168.10.2, 192.168.10.5)
LB VIP : 192.168.10.4

suvasara-MSFT 10,011 Reputation points

2022-02-04T07:41:49.92+00:00

@jw.park , Azure public Load Balancer comes as a service. You can attach this to a VNET and add backend pool VM's from the VNET that needs to be load balanced. So, it is not going to take IP from the VNET space instead you need to explicitly create a PIP for the frontend configuration.

This tutorial should give you more clarity about the ALB deployment.

suvasara-MSFT 10,011 Reputation points

2022-02-28T06:37:33.707+00:00

@jw.park , If you are not looking for a public facing load balancing solution then we have a private internal load balancer that routes traffic internally on the Azure backbone. where the load balanced IP is acquired from a virtual subnet or a static VNet IP address.
Ref Doc.

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