[pve-devel] [RFC cluster/manager/network 0/6] Add support for DHCP servers to SDN

[Stefan Hanreich]

On 9/13/23 15:48, Stefan Hanreich wrote:
> 
> 
> On 9/13/23 15:21, DERUMIER, Alexandre wrote:
>> Can't we have simply an infinite lease time,
>> and simply remove leases manually from dhcp + delete ip from ipam at vm
>> stop/delete ?
> 
> Wouldn't this cause problems if we remove the lease at stop?
> 
> * VM 1 gets IP X via DHCP on start
> 
> * We stop VM 1 and remove the lease for IP X from the IPAM
> 
> * VM 2 starts some time after and we reserve IP X for it
> 
> * We restart VM 1 and reserve some other IP Y, but the VM will never 
> send a DHCP request to our DHCP server again, since it is convinced that 
> it still owns IP X (since we told the VM that the IP is forever theirs). 
> But VM 2 now also uses IP X.

Ah sorry, DHCP leases will not persist across reboots of course. So this 
could work I think.