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Network configuration for KVM using public bridge
May 21, 2011 - 4:55am
Hello! I have installed KVM/QEMU on my LMDE (Linux Mint Debian Edition) system. The CPU is supporting hardware virtualisation:
s@pc1-lmde ~ $ grep -E '^flags.*\b(vmx|svm)\b' /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow
The kernel modules have been loaded:
s@pc1-lmde ~ $ lsmod | grep kvm kvm_intel 44826 0 kvm 224567 1 kvm_intel
The guest should use a public bridge that I have set up with /etc/network/interfaces:
s@pc1-lmde ~ $ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
auto eth1
iface eth1 inet manual
auto br1
iface br1 inet static
address 192.168.178.11
netmask 255.255.255.0
gateway 192.168.178.1
bridge_ports eth1
bridge_stp off
bridge_fd 0
bridge_maxwait 0Starting a VM with kvm command returns this error:
s@pc1-lmde ~ $ kvm -hda ~/.virtualmachines/aqemu/virtualdisk_converted/vm2-windowsxp-HD01-15G.qcow -boot c -cdrom /dev/cdrom -m 1024 -smp 1 -net nic,macaddr=00:88:4e:ad:2d:61 -net tap kvm: -net tap: could not configure /dev/net/tun (tap%d): Operation not permitted kvm: -net tap: Device 'tap' could not be initialized
Checking the permissions of file /dev/net/tun:
s@pc1-lmde ~ $ ls -l /dev/net/tun crw-rw-rw- 1 root root 10, 200 21. Mai 09:52 /dev/net/tun
When I execute
s@pc1-lmde ~ $ sudo kvm -hda ~/.virtualmachines/aqemu/virtualdisk_converted/vm2-windowsxp-HD01-15G.qcow -boot c -cdrom /dev/cdrom -m 1024 -smp 1 -net nic,macaddr=00:88:4e:ad:2d:61 -net tap
the VM will start.
Checking the permissions of file /dev/net/tun:
s@pc1-lmde ~ $ ls -l /dev/net/tun crw-rw-rw- 1 root root 10, 200 21. Mai 09:52 /dev/net/tun
Can you advice how to troubleshoot this problem?
I'm running out of ideas.
THX
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