qemu tun/tap: TUNSETIFF: Device or resource busy

[frozenQueue]

Hi. I'm trying to set up communication between a host system and a qemu vm, so the host system can access a server on the vm. Unfortunately, I don't really know what I'm doing (explanations on the Internet are not very beginner friendly) but I've been trying to follow the instructions given in the Gentoo guide for doing this via TUN/TAP.

http://en.gentoo-wiki.com/wiki/QEmu

I altered my /etc/conf.d/net file like they described and restarted network services, which created a br0 interface on the host, and used put an IP address on br0 through DHCP. I modprobed the tun module, which created a /dev/net/tun file. I added a qemu-ifup script using the code they provided, and executed my qemu session like so:

[frozenQueue]

Um... seems to be working now. After restarting the computer twice, now I can go into the VM and the eth0 interface is able to ping the host or any of the other IP address on the bridged network.

Must of been tiny, evil network gremlins messing with the Ethernet frames or something like that.

[guid0]

For those hitting this post, i had a dependency on the net-misc/vde service which was started prior to restarting the tap0 device. stopping vde, then starting net.tap0 before starting vde resolved it for me.

hope this helps.

guid0.