[Bug 475327] Re: qemu -net nic -net tap does not start due to qemu-ifXXX scripts

[Tobias Bradtke]

Similar problem for me.
I set up the following tap device

$ cat /etc/network/interfaces
<<<<
# Loopback device:
auto lo
iface lo inet loopback

# device: eth0
auto  eth0
iface eth0 inet static
  address   x.x.x.x
  broadcast x.x.x.x
  netmask   x.x.x.x
  gateway   x.x.x.x

# default route to access subnet
up route add -net x.x.x.x netmask x.x.x.x gw x.x.x.x eth0

auto tap0
iface tap0 inet manual
  tunctl_user root
  uml_proxy_arp x.x.x.x
  uml_proxy_ether eth0
  up ip link set tap0 up
  post-up sysctl -w net.ipv4.ip_forward=1
  post-up sysctl -w net.ipv4.conf.tap0.proxy_arp=1
  pre-down sysctl -w net.ipv4.ip_forward=0
  down ip link set tap0 down
>>>>

When i start the virtual domain, the following happens:

$ sudo virsh start windows-sbs
<<<<
Connecting to uri: qemu:///system
error: Failed to start domain windows-sbs
error: internal error unable to start guest: /etc/qemu-ifup: could not launch network script
qemu: Could not initialize device 'tap'
>>>>

Even when use the "ugly fix" this error persists. I can call /etc/qemu-
ifup as a normal user so there should be no problem with acces rights. I
also get the same error when i delete /etc/qemu-ifup or comment out its
content.

What can i do to avoid this error?

-- 
qemu -net nic -net tap does not start due to qemu-ifXXX scripts
https://bugs.launchpad.net/bugs/475327
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