[Bug 616064] Re: Broken networking in kvm guests

[Serge Hallyn]

I failed to reproduce this.  Here is how I tried.  I have a
10.04.1 lucid host.  My /etc/network/interfaces looks like:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto  lo
iface lo inet loopback

# The primary network interface
auto  eth0
iface eth0 inet manual

auto  br0
iface br0 inet dhcp
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
        bridge_maxwait 0

I started two 10.04.1 lucid guests, with the following command lines:

	kvm -hda m1.img -net nic,macaddr=52:54:8b:3d:1a:82,model=virtio -net tap,ifname=tap1,script=no,downscript=no -vnc :1
	kvm -hda m2.img -net nic,macaddr=52:54:8b:3d:1a:83,model=virtio -net tap,ifname=tap2,script=no,downscript=no -vnc :2

Then, on the host, I added the tap devices to br0:

	/sbin/ifconfig tap1 0.0.0.0 up
	brctl addif br0 tap1
	/sbin/ifconfig tap2 0.0.0.0 up
	brctl addif br0 tap2

and ran 'dhclient eth0' on each guest.  Then on each guest I did:

	apt-get install subversion
	svn co http://src.chromium.org/svn/trunk/tools/depot_tools

It succeeded on both.  My impression from the report is that this should
fail very quickly.  If I should keep trying in a loop please let me know.

I wonder whether vlan tagging (which you are doing) is involved in the
problem...

-- 
Broken networking in kvm guests
https://bugs.launchpad.net/bugs/616064
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