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Merge pull request #277926 from anavinahar/patch-277
Update load-balancer-floating-ip.md
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articles/load-balancer/load-balancer-floating-ip.md

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author: mbender-ms
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ms.service: load-balancer
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ms.topic: how-to
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ms.date: 04/12/2024
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ms.date: 06/11/2024
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ms.author: mbender
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ms.custom: template-how-to, engagement-fy23
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---
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## Floating IP
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Some application scenarios prefer or require the use of the same port by multiple application instances on a single VM in the backend pool. Common examples of port reuse include clustering for high availability, network virtual appliances, and exposing multiple TLS endpoints without re-encryption.
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Some application scenarios prefer or require the use of the same port by multiple application instances on a single VM in the backend pool. Common examples of port reuse include clustering for high availability, network virtual appliances, and exposing multiple TLS endpoints without re-encryption. If you want to reuse the backend port across multiple rules, you must enable Floating IP in the rule definition. Enabling Floating IP allows for more flexibility.
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| Floating IP status | Outcome |
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| --- | --- |
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| Floating IP enabled | Azure changes the IP address mapping to the Frontend IP address of the Load Balancer |
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| Floating IP disabled | Azure exposes the VM instances' IP address |
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If you want to reuse the backend port across multiple rules, you must enable Floating IP in the rule definition. Enabling Floating IP allows for more flexibility.
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In the diagrams, you see how IP address mapping works before and after enabling Floating IP:
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:::image type="content" source="media/load-balancer-floating-ip/load-balancer-floating-ip-before.png" alt-text="This diagram shows network traffic through a load balancer before enabling Floating IP.":::
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