You can modify primary IP address of any VPS that is integrated with solusvm web panel from the admin panel itself.
At first login to the VPS control panel
Click on the network tab
Here you can see the IP address list and your current main IP address in the window,The current main IP address doesn’t have a ” Set as main IP address ” button.
Click on “Set as main IP address” for the IP address you want to set as main IP.
Now the primary IP address has changed.
To make sure the new IP address is set to the correct virtual network card you must reboot the VPS.
For rebooting the VPS click on general tab and click reboot.