On Thu, Oct 25, 2007 at 10:37:32AM -0200, Marcus Andree wrote: > On 10/25/07, Michael <[EMAIL PROTECTED]> wrote: > > Hi, > > > > I've tried to run 5 QEMU guests simultanously but when trying to start > > the 5th I'll get the following error message: > > > > warning: could not open /dev/tun7 (No such file or directory): no > > virtual network emulation > > Could not initialize device 'tap' > > > > I have no idea why it looks for /dev/tun7 but after that I cd'ed to /dev > > and issued the command "./MAKEDEV tun4" but now I get the following > > message when starting qemu: > > > > <snip> > > Maybe you'll have to compile a new kernel. There's an options(4) option > called tun. I had to add something like > > pseudo-device tun 16 > > on a kernel config file once. If I remember correctly, the default is the > kernel > to allocate 4 tun channels. That would explain why it's failing in the 5th > QEMU > guest. > > Don't forget that customized kernels aren't "supported". >
This is no longer true. tun(4) can be auto generated without issues. The only thing you need to make sure is that the /dev nodes exist. I'm running multiple qemu sessions with up to 20 tun interfaces without issues but I'm not using if-up at all. I'm passing fds to qemu with -net tap,vlan=$id,fd=$fd -- :wq Claudio
