2016-05-24 19:33 GMT+03:00 Laine Stump <laine@xxxxxxxxx>: > > So ignoring the IPv6 addresses for now. You now have a tap device on the > *host* that has the following IP addresses: > > $HOST_IP peer $VM_IP/32 > $VM_GW > 169.254.169.254 > > I'm guessing that in the guest you configure its ethernet to have > > $VM_IP peer $HOST_IP/24 (or some other prefix < 32) > route add default $VM_GW ($VM_GW on same subnet as $HOST_IP/24) No, inside guest i'm assign address via dhcp to $VM_IP/24 (not using peer) and route add default $VM_GW peer only used on host machine to determine on which interface kernel needs to send traffic > > (I'm not sure what the guest does with 169.254.169.254) > > What if you instead set the host to: > > $HOST_IP peer $VM_IP/32 > > and set the guest to: > > $VM_IP peer $HOST_IP/32 > route add default $HOST_IP > > ?? > I don't use this scheme... If i set $VM_IP peer $HOST_IP/32 on host machine i think kernel recieves packet and drop it =) > Anyway, it's important to know if you set the IP config on host and guest to > exact mirrors of each other. It seems like the answer is "no", though, so > i'm going to make a patch that allows what I was talking about last week: > > > <interface type='ethernet'> > <source> > <ip address='HOST_IP' family='ipv4' peer='VM_IP' prefix='32'/> > <ip address='VM_GW' family='ipv4' prefix='32'/> > </source> > <ip address='VM_IP' family='ipv4' peer='HOST_IP' prefix='24'/> > <route family='ipv4' address='0.0.0.0' gateway='HOST_IP'/> > ... > </interface> > > On qemu only the address info inside <source> would be used, since we don't > have control over the guest's network config. On LXC, we can set both. > > Does that sound usable? Yes, but don't cleanup please <ip address='VM_IP' family='ipv4' peer='HOST_IP' prefix='24'/> in qemu case, because on somedays we can launch dnsmasq or orhet software that can provide dhcp and use this element.. -- Vasiliy Tolstov, e-mail: v.tolstov@xxxxxxxxxxxxxx -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list