Daniel: This discussion used to be on the libvirt list, but seems more appropriate for the users list so I am replying here.

At some time in the past we did set the MAC address on the host interface too, but it caused networking problems in some configurations

I see. Thanks for the background info.

I guess you have Cacti configured to pull stats directly from the TAP devices on the host ?

I am using bridging, but you are correct. I installed snmpd and have Cacti pulling stats from it.

Cacti has the ability to run scripts to pull in statistics, so my recommendation would be to add a shell script which calls the 'domifstat' command in virsh virsh domifstat DOMNAME TAPDEVNAME

The Cacti server is running in a separate machine, not on the host. I guess I will have to find something that makes the domifstat data available via an snmp interface. Do you know of such a tool? Thanks, Neil -- Neil Aggarwal, (281)846-8957, http://UnmeteredVPS.net/centos CentOS 5.4 VPS with unmetered bandwidth only $25/month! No overage charges, 7 day free trial, PayPal, Google Checkout