Impossible to add good network values "Validation failed: IP address can't be the network or broadcast address" - OVH (ESXI/Proxmox) with screenshots

[ElKorbo]

@danb35, @GG_jr: CentOS VM configuration details:

• https://support.us.ovhcloud.com/hc/en-us/articles/360002175944-How-to-Connect-a-VM-to-the-Internet-Using-VMware-ESXi#centos7
• https://support.us.ovhcloud.com/hc/en-us/articles/360002394324-How-to-Connect-a-VM-to-the-Internet-Using-Proxmox-VE#centos7
• Configuring a network bridge | OVH Guides (search CentOS in page)

You can see other people with the problem here:

• Not able to install on OVH VPS
• Install NS7 on Centos 7 on OVH VPS
• Neth 7 Networking Problems with OVH Custom ip rules

The problem is that the Cockpit Dashboard - Network section can not permit to add the configuration, screenshots previously here:

• Impossible to add good network values "Validation failed: IP address can't be the network or broadcast address" - OVH (ESXI/Proxmox) with screenshots

When we edit manually (without Cockpit Dashboard), it works (but it is modified by NethServer when we update/change other settings) after manually edition of /etc/sysconfig/network-scripts/ifcfg-ensXXX and creation of /etc/sysconfig/network-scripts/route-ensXXX.