1. Overview

This test was conducted to verify if configuring Floating IP along with a Loopback interface or a Secondary IP on the Guest OS can effectively prevent the Hairpin phenomenon that occurs in the Azure Internal LoadBalancer (ILB).

2. Objective

• To analyze the root cause of the ILB Hairpin phenomenon.
• To verify communication between VMs when ILB is configured with Floating IP and Loopback.
• To verify communication between VMs when ILB is configured with Floating IP and Secondary IP.

3. Test Conditions

1. ILB Hairpin 현상은 왜 발생하는가 ?

• 참고 문서

2. ILB **(FloatingIP + Loopback)**구성 시, ****VM간 통신이 가능한가?

패킷을 받은 vm1은 Destination IP가 10.0.0.10이기 때문에 자신에게 온 패킷이라고 생각하지 않습니다.

이러한 문제를 해결하기 위해 루프백 인터페이스에 10.0.0.10을 추가합니다.

• 참고 링크