[Qemu-devel] [Bug 1404278] Re: tap connections not working on windows host

[neil prideaux]

I also confirm the problem on Windows 7 host.

I tried the following over the past few nights:
Downloaded the OpenVPN tap 32 adapter. Installed it and gave it a different 
network address (192.168.200.10) to my normal LAN (192.168.1.10). Bridged the 2 
connections, which gets me a new IP via DHCP at the bridge (192.168.1.101). 

Got latest QEMU 2.2.0 for Windows from \lassauge.free.fr.
Got linux images from https://people.debian.org/~aurel32/qemu/armel/ and used 
the command as per the instructions there. Further added the -net tap swithches 
to the cmd line, similar to above.

Debian guest boots up ok, but TAP networking is not happening, no matter
what combinations or permutations i've tried to configure the guest net
iface.

On the other hand, I obtained dsl-4.4.10-embedded.zip  which comes with
its own QEMU from
http://ftp.heanet.ie/mirrors/damnsmalllinux.org/current/. After changing
the command line to start QEMU with the -tap switch, and configuring dsl
for dhcp, i was up and running immediately (automagically obtained its
own ip as my host network as 192.168.1.102, same gateway as host
network, pings ok in either direction, even pings google.com). This
proves the tap adapter and bridge is configured correctly on the host
side, and the supplied QEMU version works ok - can't tell exactly which
QEMU version but it is circa 2006.

After this attempt i've tried other versions of QEMU 1.6.0, and 1.1.1
with the same debian client still the same problem. i.e. boots up ok
except for the TAP networking.

It is most likely a QEMU problem, but i am amazed at the number of blog
posts of ppl claiming it to be working. It is unlikely they used a
recent QEMU version.

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https://bugs.launchpad.net/bugs/1404278

Title:
  tap connections not working on windows host

Status in QEMU:
  New

Bug description:
  using latest qemu 2.2.0 64bit for windows host (installed from
  qemu-w64-setup-20141210.exe obtained from http://qemu.weilnetz.de/w64/
  ),OpenVPN 2.6.3-I601 64bit tap adapter named tap01 and calling qemu
  using the following.

  qemu-system-x86_64.exe -m 512 -net nic -net tap,ifname=tap01 -hda
  "c:\\data\\images\\test.img"

  where the image contains a slackware 14.0 64bit install.
  The tap is bridged with the real network adapter and the bridge is given an 
ip of 10.1.1.41 (which works as the ip for the windows host). The tap adapter 
(in network connections) shows connected when the qemu vm is running. inside 
the vm, the network is given an ip of 10.1.1.143 (the netmask and default 
gateway are the same for the virtual and real pc).
  fault.
  The vm cannot see the rest of the local network or visa-versa. This used to 
work in early (0.9 32bit) versions of qemu.

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