Learn how to determine the maximum number of outbound connections a backend pool virtual machine can establish in Azure when using default SNAT ports. Understand the key details for configuring your Azure load balancer effectively with 500 VMs.
Table of Contents
Question
You have an Azure load balancer that has a single frontend IP address and a backend pool of 500 virtual machines.
You create an outbound SNAT rule that has the default number of outbound ports.
You need to identify the maximum number of outbound connections that a backend pool virtual machine can establish simultaneously.
How many connections should you identify?
A. 32
B. 64
C. 256
D. 1,024
Answer
B. 64
Explanation
When the load-balancing rules are configured to use default port allocation, or when the outbound rules have the Use the default number of outbound ports setting configured, SNAT ports are allocated by default based on the backend pool size. The backend will receive the number of ports defined by the table, per frontend IP, up to a maximum of 1,024 ports.
1-50 VM instances in backend pool -> 1,024 default SNAT ports
51-100 VM instances in backend pool -> 512 default SNAT ports
101-200 VM instances in backend pool -> 256 default SNAT ports
201-400 VM instances in backend pool -> 128 default SNAT ports
401-800 VM instances in backend pool -> 64 default SNAT ports
801-1,000 VM instances in backend pool -> 32 default SNAT ports
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