[SOLVED] Network is unreachable

[paralosreg]

Good afternoon.
I made a change in network device with the power on VM. I had selected the Realtek card and have changed the Virtio card. It has given me an error and since then I can not access the Internet from the VM. When I try to ping it tells me that the host is unreachable. I restarted the VM, I have again chosen the Realtek card, I even removed the network adapter and have re-created but It always return the same error.
With ifdown an then ifup the error is network is unreachable.
I work with CentOS 7
Thx

 

[paralosreg]

Ok I solved this. When Proxmox Console crash on te hot change, it flush the route table. route -n returns empty table. After add default gateway and -net it works.
Thx