Dear Francesc Guasch.Thank you for your reply.
Thanks for introducing your article , It seems to use IP masquerade and routing as Laine Stump said (
https://www.redhat.com/archives/libvirt-users/2020-July/msg00019.html).
> It is way outdated, but you may contact me directly if you want.
Thanks for your concern. But sorry , I considered using another virtual machine manager.
Because of stacking the kubernetes environment on top of this layer,I want to make this layer as simple as possible.
Best regards.