On Thu, May 31, 2007 at 11:43:43PM -0700, H. Peter Anvin wrote: > Avi Kivity wrote: > > H. Peter Anvin wrote: > >> Axel Kittenberger wrote: > >> > >>> Unfortunally all machines detect the same ethernet address > >>> '52:54:00:12:34:56'. Which you can guess what i means, networking comes > >>> and goes whatever machine last the ethernet address got hold of from the > >>> gateway. I tried specifing an ethernet-adress with "-net > >>> nic,macaddr=$MAC" but this also didn't work through. > >>> > >>> For now I just hardseted the mac in all machines to 52:54:00:12:34:57, > >>> 52:54:00:12:34:58 and so on. > >>> > >>> > >> This is a Qemuism. I always thought it was dumb, but I guess Qemu > >> wanted reproducibility over everything. > >> > >> IMNSHO it would have been much better to default to a random value > >> (meaning that all except the bottom 2 bits of the first octet are > >> random, those bits should be set to 10 binary.) > >> > >> > > > > That tends to consume dhcp leases quickly, if you start guests often (as > > I do). Also, some distributions use the mac address as a key for naming > > interfaces; if it changes, the guest gets confused > > > > The right solution to that, of course, is a VM definitions file, so the > random Ethernet address is only generated once. For Qemu/KVM, that > could at least in theory simply be a shell script.
This is the approach we use in libvirt. If the user defines a guest and does not provide a mac address, we generate one for each NIC and store it in the config file, so every time it gets the same MAC. Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
