Hello everyone,

I've been looking around on the forum for a solution to my problem but I didn't found it...

1st part of my problem:
I have 3 VMs working with QEMU KVM on a same host, I would like those VM to be able to comunicate together on private IP addresses (I do not want them to be reacheable from outside), I tought about making a bridge on the host and just giving the addresses to the VM using tap...
To do that I have setup this into my host /etc/network/interfaces:

Code:
# The loopback network interface
auto lo eth1 tap01 tap02 br0
iface lo inet loopback

iface eth1 inet dhcp

iface tap03 inet manual
pre-up tunctl -u g -t tap03

iface tap02 inet manual
pre-up tunctl -u g -t tap02

iface tap01 inet manual
pre-up tunctl -u g -t tap01

iface br0 inet static
bridge_ports tap01 tap02 tap03
bridge_maxwait 0
address 172.168.1.10
netmask 255.255.255.0

And on each VM I just declare a static network address this way:

Code:
iface eth0 inet static
address 172.168.1.x
netmask 255.255.255.0

And I launch the VMs this way:

Code:
kvm -m 512 vm1.img -net nic -net tap,ifname=tap01 &
kvm -m 512 vm2.img -net nic -net tap,ifname=tap02 &
kvm -m 512 vm3.img -net nic -net tap,ifname=tap03 &

I use tap because otherwise the host system does not see the VMs ethernet interfaces.

Well this does not work, each VM can ping the bridge but they can not reach each other.
I must be doing something wrong, does the bridge need an IP address ? should I declare the VM's IP in the host machine or just like I do, in the VM machines themselves ?

Because I've been reading a lot of topics I'm not sure about how to do, i tried to use a vlan by starting the VMs like this:

Code:
qemu VM.img -net nic,model=rtl8139,vlan=1 &

This does not work anymore :(

Thanks for your help, any sugestions are welcome ;)