I'm trying to get NAT networking working with libvirt/virtual-manager and KVM on Mandriva Linux. I installed dnsmasq (and disabled the init script, as libvirt starts up dnsmasq manually), bridge-utils, and added MII_NOT_SUPPORTED=yes to /etc/ sysconfig/ifcfg-virbr0, otherwise Mandriva's network scripts would immediately try to get an IP on virbr0 with DHCP, removing the correct IP address set by libvirt on its activation. So currently I have: # virsh net-list --all Name State Autostart ----------------------------------------- default active yes # brctl show bridge name bridge id STP enabled interfaces pan0 8000.000000000000 no virbr0 8000.000000000000 yes # ifconfig eth0 Link encap:Ethernet HWaddr 00:21:70:AC:B0:8A UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Memory:f6ae0000-f6b00000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:9664 errors:0 dropped:0 overruns:0 frame:0 TX packets:9664 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:45094959 (43.0 MiB) TX bytes:45094959 (43.0 MiB) virbr0 Link encap:Ethernet HWaddr EE:F4:3D:09:50:15 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 inet6 addr: fe80::ecf4:3dff:fe09:5015/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:52 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:11785 (11.5 KiB) wlan0 Link encap:Ethernet HWaddr 00:16:EA:4C:A9:38 inet addr:192.168.100.24 Bcast:192.168.100.255 Mask:255.255.255.0 inet6 addr: fe80::216:eaff:fe4c:a938/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1496 errors:0 dropped:0 overruns:0 frame:0 TX packets:899 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:464043 (453.1 KiB) TX bytes:157558 (153.8 KiB) wmaster0 Link encap:UNSPEC HWaddr 00-16-EA-4C-A9-38-20- B4-00-00-00-00-00-00-00-00 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination # ps aux | grep dnsmasq nobody 2892 0.0 0.0 12388 920 ? S 22:26 0:00 dnsmasq --keep-in-foreground --strict-order --bind-interfaces --pid-file --conf- file --listen-address 192.168.122.1 --except-interface lo --dhcp- leasefile=/var/lib/libvirt/dhcp-default.leases --dhcp-range 192.168.122.2,192.168.122.254 However, I still fail to get an IP address in my virtual machine. In the logs, I cannot find anything problematic at first sight, libvirtd when ran with the verbose option, continuously gives this: Oct 19 22:45:02 defected libvirtd: EVENT: Poll got 1 event Oct 19 22:45:02 defected libvirtd: EVENT: Dispatch 10 1 0x633040 Oct 19 22:45:02 defected libvirtd: EVENT: Remove handle 10 Oct 19 22:45:02 defected libvirtd: EVENT: mark delete 5 Oct 19 22:45:02 defected libvirtd: EVENT: Add handle 10 25 0x406e40 0x633040 Oct 19 22:45:02 defected libvirtd: EVENT: Remove handle 10 Oct 19 22:45:02 defected libvirtd: EVENT: mark delete 6 Oct 19 22:45:02 defected libvirtd: EVENT: Add handle 10 28 0x406e40 0x633040 Oct 19 22:45:02 defected libvirtd: EVENT: Calculate expiry of 0 timers Oct 19 22:45:02 defected libvirtd: EVENT: Timeout at 0 due in -1 ms Oct 19 22:45:02 defected libvirtd: EVENT: Poll on 6 handles 0x6574c0 timeout -1 Oct 19 22:45:02 defected libvirtd: EVENT: Poll got 1 event Oct 19 22:45:02 defected libvirtd: EVENT: Dispatch 10 4 0x633040 Oct 19 22:45:02 defected libvirtd: EVENT: Remove handle 10 Oct 19 22:45:02 defected libvirtd: EVENT: mark delete 5 Oct 19 22:45:02 defected libvirtd: EVENT: Add handle 10 25 0x406e40 0x633040 Oct 19 22:45:02 defected libvirtd: EVENT: Calculate expiry of 0 timers Oct 19 22:45:02 defected libvirtd: EVENT: Timeout at 0 due in -1 ms Oct 19 22:45:02 defected libvirtd: EVENT: Poll on 6 handles 0x6574c0 timeout -1 Oct 19 22:45:02 defected libvirtd: EVENT: Poll got 1 event Any idea what is wrong or what I should check to debug this further? -- Frederik Himpe