Problem with application network when we try to switch xen version to kvm using grub.cfg

[mydatascience]

Description

When we switch xen to kvm using grub.cfg (uncomment kvm line) the application loses the network

Application : Ubuntu 16.04 (using zcloud)

Steps to Reproduce

Using eve onboarded and connected to Zcontrol:

packet-cli server create -f ams1 -o custom_ipxe -i
https://github.com/lf-edge/eve/releases/download/5.19.0/ipxe.ip.efi.cfg
-P t1.small.x86

Connect to eve using ssh - go to /config/grub.cfg - uncomment the kvm line

Then reboot the eve

Application runs (I can connect using VNC) but is unable to see the network Before the same app works perfectly

Actual Results

Can't connect to ssh / outer world

Expected Results

Applications works as before and do not lose the network

Additional Information