Blocked traffic on a public IP on a Load balancer


azure

Issue:

You setup a new Load balancer with public IP(s) for incoming traffic, but when testing, all incoming traffic is blocked. No reason, its just blocked.

(Resolution at the end…)

Scenario:
Azure based environment.
An appliance (or a VM) with one or two NIC’s connected to a public IP

Resolution:
Add a NSG to the public IP’s…and specifically allow the traffic you want to allow, if you don’t care, add from any to any port *
If you don’t add an NSG to the NIC, traffic to the Public IP will be blocked…it just is.

Azure Firewall SNAT private IP address ranges
https://technet.microsoft.com/en-us/library/mt683473(v=office.16).aspx

Deploy an Azure Firewall with multiple public IP addresses using Azure PowerShell
https://docs.microsoft.com/en-us/azure/firewall/deploy-multi-public-ip-powershell

Thanks to:
Thomas Vuylsteke – Microsoft Azure Fasttrack team
Microsoft Premier Support
Akelius Residential Property AB (Martin Supan, Mattias Segerström)


___________________________________________________________________________________________________

Enjoy!

Regards

 Thomas Odell Balkeståhl on LinkedIn

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