akrasnov-drv opened a new issue, #11607:
URL: https://github.com/apache/cloudstack/issues/11607

   ### problem
   
   I faced a weird issue when CloudStack assigns to VM IP used by vRouter.
   I tried removing all VMs, removing vRouter, but it did not help.
   My configuration - shared network with separate management and guest subnets
   Guest network IPs:
   <img width="1205" height="313" alt="Image" 
src="https://github.com/user-attachments/assets/7a3b933a-34bc-4349-b1e6-0c4ec162f96e";
 />
   
   Still on new VM start I'm getting
   
   <img width="1419" height="182" alt="Image" 
src="https://github.com/user-attachments/assets/5ed30d01-0735-4e36-9f8e-f7b5db751187";
 />
   
   As you can see on attachments 10.10.126.13  is used by vRouter but still 
assigned to VM
   
   ### versions
   
   CloudStack 4.21.0.0
   KVM
   Ubuntu 24
   vRouter Software 4.21.0.0, template 4.20.1
   I can provide mysql data on request
   
   ### The steps to reproduce the bug
   
   1. Configured CS with shared network (dns, dhcp, metadata server) - v4.19
   2. Defined guest subnet (no vlan)
   3. upgraded to 4.20, then to 4.21 (I have not noticed if already had an isse 
on previous versions, but can't tell for sure it started just with 4.21)
   3.Faced the issue of VM not getting name and IP from vRouter, and finally 
found duplicate IP assignment.
   
   
   ### What to do about it?
   
   CS should not assign IPs in use. I hardly understand why it happens at all. 
As you can see CS is aware that the IP is allocated already.


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