On 03/30/2011 02:18 PM, Richard W.M. Jones wrote:
A domain does not have an IP address. A domain is equivalent to a PC in hardware, which might have none, 1 2 or more network cards, each one with it's own MAC address. This is the only propertpy of the hardware and can be configured via the domain XML description. What IP address your hosts uses is in complete control of your guest operating system: It might configure no IP addresses at all, use a mix of IPv4 and ipv4 addresses, use static assignment, or use external services like DHCP, but is completely independent from the hardware. So from libvirts point of view, your domain does not have an IP address.
All of the above is absolutely true. Nevertheless you can probably get the IP address that a guest has chosen by reading out config files or (for the Windows) the Registry.
Also, it is possible to sniff network traffic to determine the IP address of a guest, and the nwfilter implementation uses just that. The documentation covers some of the details and limitations of nwfilter guessing an IP address based on traffic sniffing: http://libvirt.org/formatnwfilter.html#nwflimitsIP -- Eric Blake eblake@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org