Azure LoadBalancer ( ILB / PLB ) Flow Log

Badr HOUSSNI 46

Hi,
My question is as simple as described on the title.
Can i activate any logs on traffic passing trough my loadbalancers like on NSG's ?

I found healthprobes and metrics Logs but not flow logs ( source destination port ... )

Thank you.

GitaraniSharma-MSFT 49,011 Reputation points Microsoft Employee

2021-02-25T14:34:17.573+00:00

Hello @Badr HOUSSNI ,

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" and Up-Vote for the same, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Thanks,
Gita

1 answer

GitaraniSharma-MSFT 49,011 Reputation points Microsoft Employee

2021-02-23T15:15:19.097+00:00

Hello @Badr HOUSSNI ,

You can use NSG flow logs in Network Watcher to generate flow logs for any VM’s traffic, including that which traverses the Load Balancer resource. This is described here: https://learn.microsoft.com/en-us/azure/network-watcher/network-watcher-nsg-flow-logging-overview

Enable NSG logs : https://learn.microsoft.com/en-us/azure/network-watcher/network-watcher-nsg-flow-logging-portal

Kindly let us know if the above helps or you need further assistance on this issue.

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Badr HOUSSNI 46 Reputation points

2021-02-26T11:13:26.583+00:00

Hi, thank you for your response.
We are actually using NSG's and NSG flox logs. But our concern is about the flow passing through the InternalLB into the PublicLB.
This kind of flow is for us not seen on our NSG flow logs that have only the ILB on it not the PLB.
Please let me know if you need more precision's.

GitaraniSharma-MSFT 49,011 Reputation points Microsoft Employee

2021-03-01T15:31:47.52+00:00

Hello @Badr HOUSSNI ,

I would need some more context on your existing network. Could you please share some more details on the setup and where you would like to incorporate NSG flow log in it?

Thanks,
Gita

GitaraniSharma-MSFT 49,011 Reputation points Microsoft Employee

2021-03-08T08:02:46.577+00:00

Hello @Badr HOUSSNI ,

Following up on this issue to get more details on your existing network setup and where you would like to incorporate NSG flow log in it.

Thanks,
Gita

GitaraniSharma-MSFT 49,011 Reputation points Microsoft Employee

2021-03-15T08:09:34.213+00:00

Hello @Badr HOUSSNI ,

Hope you are doing well. I'm following up again on this issue to get more details on your existing network setup and where you would like to incorporate NSG flow log in it.

Thanks,
Gita

Srinivas Nakkala 0 Reputation points

2024-06-12T16:44:24.0733333+00:00

Hi Gitarani,

We have the load balancer which created from aro cluster,

when i working on flow logs for the particular load balancer i don't see any option to enable flow logs for LB and even in diagnostic setting I would only see health probes.

could you please assist or let me know the possibility of enabling the flow logs for load balancers.

Thanks

Srinivas Nakkala
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Azure LoadBalancer ( ILB / PLB ) Flow Log

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