[libvirt] Set allmulticast automatically on macvtap interfaces

Hi, the easiest way to connect a domain to a network is a macvtap interface with the following XML code: <interface type='direct'> <mac address='52:54:00:fb:de:4d'/> <source dev='int181' mode='bridge'/> <target dev='macvtap1'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> This makes everything work but incoming IPv6, which relies on multicast, which is filtered by the macvtap interface by default. I need to do "ip link set dev macvtap1 allmulticast on" on the host after starting the domain to make incoming IPv6 work. trustGuestRxFilters attribute to yes would help here. However, https://libvirt.org/formatdomain.html#elementsNICS says If the model type is set to virtio and interface's trustGuestRxFilters attribute is set to yes, changes made to the interface mac address, unicast/multicast receive filters, and vlan settings in the guest will be monitored and propagated to the associated macvtap device on the host Does that mean that the guest will be able to change its VLAN to any other VLAN that is present on the host? Or am I misunderstanding things here? Assuming that trustGuestRxFilters is the right thing to do and that it does not open myself to blatant security issues, how would I set that from virt-manager? Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421