Hi,

I want to create a tap interface tap0 and a bridge br0 in ubuntu 11.10. i want to use this bridge br0 to link eth0 and tap0 for gns3. Also i want these interfaces to be persistent(not lost on reboot). Any suggestions??

Thanks in advance

1. I use two nics per box. One is the hardware/host NIC, the other my VM bridge/tap interface.

2. Remember to set the hardware interface (eth0/eth$X) to promiscuous on the VM interface.

3. Create a tap interface using tunctl. A very handy feature of tunctl is the ability to set user and group so your VM's can run under lower privileges. In Debian, I find the package with 'apt-cache search tunctl' and it returns the right name.

Create a bridge using brctl. In Debian, I believe the package is called bridge-utils. Setup varies depending on the package you use. The tap interface is one end, the bridge interface is the other. then the BRIDGE gets assigned an IP address. I set it all in /etc/network/interfaces.

Your ifconfig-fu will be much better after setting a couple of VM's up!