libvirt users - Mar 2011 - how to restart the network connection of kvm guest OS ?

When a vm move from one VLAN(e.g. VLAN 1) to another VLAN (e.g. VLAN 2), it is
needed to restart the network connection of guest OS, so that it can begin a
dhcp discover and get a new ip again. But i can't find the way to restart
the guest os's network connection by libvirt (neither python API nor virsh
command). Is any other ways? PS: i found that the VirtualBox can detach the
cable of VMs and re-attach so that the guest OS will recognize and restart a
dhcp discover when the cable re-attach. I guess the KVM will have some feature
like that , is anybody know something about that?


thanks and looking forward to your answers.
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?? 2011??03??24?? 19:16, ?????? ????:
> When a vm move from one VLAN(e.g. VLAN 1) to another VLAN (e.g. VLAN 2),
> it is needed to restart the network connection of guest OS, so that it
> can begin a dhcp discover and get a new ip again. But i can't find the
> way to restart the guest os's network connection by libvirt (neither
> python API nor virsh command). Is any other ways?
Hi,

Won't virt-manager (if has) in your guest try to restart the network?
> PS: i found that the VirtualBox can detach the cable of VMs and
> re-attach so that the guest OS will recognize and restart a dhcp
> discover when the cable re-attach. I guess the KVM will have some
> feature like that , is anybody know something about that?
Libvirt supports similar function.
# virsh detach-interface
# virsh attach-interface

Or
# virsh detach-device
# virsh attach-device

the difference between "*-device" and "*-interface" is the
accepted arguments, the later one accepts interface xml.

Regards
Osier