Re: [Qemu-devel] Bug of Qemu when running TAP device on Windows?

[Paul Sokolovsky]

Hello Tieu,

       Do you think that posting same long mail several times will get you more answers than careful reading of docs/some thought? ;-)

Wednesday, August 9, 2006, 11:31:51 AM, you wrote:

>

Hi all, I ran successfully Qemu to simulate ARM system on Linux host with the following command: ./qemu-system-arm -kernel zImage.integratorCP -append "root=/dev/nfs nfsroot=192.168.7.1:/mnt/nfsqemu rw ip=192.168.7.2::192.168.7.1:255.255.255.0 " -net nic,vlan=0 -net tap,vlan=0,ifname=tap0,script=./qemu-ifup The content of qemu-ifup script is:  ifconfig tap0 192.168.7.1

>	But my project demands me to run this ARM system on Windows host. So I modify a bit the qemu-ifup script as: ipconfig tap0 192.168.7.1 # "ipconfig" , not "ifconfig"

       Cool solution, but did you try to run that on your own?

>	And the corresponding command on Windows is: qemu-system-arm -kernel zImage.integrator -append "root=/dev/nfs nfsroot=192. 168.7.1:/c/cygwin/openpsionfiltered=192.168.7.2::192.168.7.1:255.255.255.0" -net nic,vlan=0 -net tap,vlan=0,ifname=tap0,script=./qemu-ifup

       Ok, so QEMU under Windows is a bit unlike Linux. There, ifname is what you see in "Network connections", something long incomprehensible like "Local area network connection #N". Be especially wary of localized names. So, you better rename it to contain ASCII only. You can even rename it to "tap0". Also, Windows TAP doesn't require "script" - after all, you set connection's parameters with right-clicking on it, and it's being "upped" automagically on client start (but yes, you can leave it there; that way (assuming renaming conn to "tap0"), you can have portable startup command line ;-) ).

     I'm successfully running Linux/ARM in QEMU booting off NFS in coLinux running on the same machine. Windows XP emulates router between them ;-) : http://handhelds.org/hypermail/familiar/312/31225.html

       Here's my command line: 

qemu-system-arm.exe  -L . -kernel zImage-2.6.16-qemuarm-20060525084935.bin -initrd bootstrap-image-bootchart-v0.8.4-rc3-h4000.rootfs.ext2.gz -append "root=/dev/ram0 rw init=/sbin/bootchartd ramdisk_size=16384 ip=192.168.30.2:192.168.30.1:192.168.30.1:255.255.255.0" -net nic,vlan=0 -net tap,vlan=0,ifname="TAP-qemu-arm"

-- 

Best regards,

 Paul                            mailto:address@hidden