<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>I changed <interface type='ethernet'> to <interface type='bridge'> and it worked.<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> C V <rayvittal-lists@yahoo.com><br><b><span style="font-weight: bold;">To:</span></b> fedora-virt@redhat.com<br><b><span style="font-weight: bold;">Sent:</span></b> Tue, December 8, 2009 8:23:33 PM<br><b><span style="font-weight: bold;">Subject:</span></b> [fedora-virt] Fw: fc12 virsh tap networking problem<br></font><br> <div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br> <div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div>Hi,<br>On a fresh FC12 system, I am able to create and run KVM-based vms with tap networking using the qemu-kvm <span class="yshortcuts" id="lw_1260382870_0">command line</span> but not using virsh.<br>I have user and group set to "root" in /etc/libvirt/qemu.conf. "user mode networking" works with virsh, but not tap! selinux is disabled. <br><br>I have this xml:<br><domain type='kvm'><br> <name>centos</name><br> <uuid>22d9d573-d82c-c18d-36c0-d3ffef057468</uuid><br> <memory>131072</memory><br> <vcpu>1</vcpu><br> <os><br> <type arch='x86_64'>hvm</type><br> </os><br> <features><br> <acpi/><br> <pae/><br> </features><br> <clock offset='utc'/><br> <devices><br> <emulator>/usr/bin/qemu-kvm</emulator><br> <disk type='file' device='disk'><br> <source file='/var/lib/images/centos.5-4.x86-64/centos-small.img'/><br> <target dev='hda' bus='ide'/><br> </disk><br> <interface type='user'><br> <mac address='52:54:00:7e:5b:58'/><br> </interface><br> <interface type='ethernet'><br> <mac address='52:54:00:2e:33:c8'/><br> <script path='/var/lib/images/centos.5-4.x86-64/qemu-ifup'/><br> </interface><br> <graphics type='vnc' port='5910' autoport='no' listen=''/><br> </devices><br></domain><br><br>This won't start even when I execute virsh as root:<br>[root@fc12 centos.5-4.x86-64]# virsh -c qemu+unix:///system create domr.xml <br>error: Failed to create domain from domr.xml<br>error: monitor socket did not show up.: No such file or directory<br>[root@fc12 centos.5-4.x86-64]# tail -3 /var/log/libvirt/qemu/centos.log <br>LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -S -M pc-0.11 -m 128 -smp 1 -name centos -uuid 22d9d573-d82c-c18d-36c0-d3ffef057468 -monitor unix:/var/lib/libvirt/qemu/centos.monitor,server,nowait -boot c -drive file=/var/lib/images/centos.5-4.x86-64/centos-small.img,if=ide,index=0,boot=on -net nic,macaddr=52:54:00:7e:5b:58,vlan=0,name=nic.0 -net user,vlan=0,name=user.0 -net nic,macaddr=52:54:00:2e:33:c8,vlan=1,name=nic.1 -net tap,script=/var/lib/images/centos.5-4.x86-64/qemu-ifup,vlan=1,name=tap.0 -serial none -parallel none -usb -vnc :10 -vga cirrus <br>warning: could not configure /dev/net/tun: no <span class="yshortcuts" id="lw_1260382870_1">virtual network</span> emulation<br>qemu: Could not initialize device 'tap'<br><br>'***** But I can execute the same command line and it works!!********<br>[root@fc12 centos.5-4.x86-64]# LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -S -M pc-0.11 -m 128 -smp 1 -name centos -uuid 22d9d573-d82c-c18d-36c0-d3ffef057468 -monitor unix:/var/lib/libvirt/qemu/centos.monitor,server,nowait -boot c -drive file=/var/lib/images/centos.5-4.x86-64/centos-small.img,if=ide,index=0,boot=on -net nic,macaddr=52:54:00:7e:5b:58,vlan=0,name=nic.0 -net user,vlan=0,name=user.0 -net nic,macaddr=52:54:00:2e:33:c8,vlan=1,name=nic.1 -net tap,script=/var/lib/images/centos.5-4.x86-64/qemu-ifup,vlan=1,name=tap.0 -serial none -parallel none -usb -vnc :10 -vga cirrus &<br>[2] 4543<br><br>[root@fc12 centos.5-4.x86-64]# ps -ef | grep qemu<br>root 4543 3449 0 19:02 pts/12 00:00:00 /usr/bin/qemu-kvm -S -M pc-0.11 -m 128 -smp 1 -name centos -uuid 22d9d573-d82c-c18d-36c0-d3ffef057468 -monitor unix:/var/lib/libvirt/qemu/centos.monitor,server,nowait -boot c -drive file=/var/lib/images/centos.5-4.x86-64/centos-small.img,if=ide,index=0,boot=on -net nic,macaddr=52:54:00:7e:5b:58,vlan=0,name=nic.0 -net user,vlan=0,name=user.0 -net nic,macaddr=52:54:00:2e:33:c8,vlan=1,name=nic.1 -net tap,script=/var/lib/images/centos.5-4.x86-64/qemu-ifup,vlan=1,name=tap.0 -serial none -parallel none -usb -vnc :10 -vga cirrus<br></div> </div></div></div> </div></div></div>  </div></body></html>