Incorrect Geo GSLB Loadbalancing behavior in case of floating point coordinates

Products

• VMware Avi Load Balancer

Issue/Introduction

When the GSLB Services or sites are referenced by Latitude and Longtitude coordinates in floating point in the GeoDB entry. This may lead to a scenario where an incorrect pool/site is chosen.

Environment

Avi Loadbalancer version 22.1.7, 30.2.2., 31.1.1 and below

Cause

The issue is caused due to a bug in the code with floating point round off calculations.

A server and client location can differ by up to 1 unit along the scaled longitude and scaled latitude used by Avi in calculating distance.

This issue happens only if there is a fraction involved.

If longitude and latitude are whole integer values this issue will not happen.

Resolution

Workaround: 

Edit the Geodb entries in the custom geodb file used to use whole integer values for the coordinates.

Bug ID: AV-232777

Fix Version: 30.2.3, 31.1.2, 22.1.7-2p6, 31.1.1-2p2