[Bug 584048] Re: kvm images losing connectivity w/bridged network

[Serge Hallyn]

I can't reproduce this on my lucid testbox.  Do you have networkmanager
or wicd installed?  Leaving wicd installed, for instance, caused my
box to frequently add a duplicate default route, which stopped my
network.

Can you gather the output, both when network is up, and while it is
paused, of:

	netstat -nr
	ifconfig -a
	brctl show
	ps -ef

====

To show precisely how I tried to reproduce, I did:
	apt-get remove network-manager
	apt-get remove wicd
	cat > /etc/network/interfaces << EOF
		auto lo
		iface lo inet loopback

		auto eth0
		iface eth0 inet manual

		auto br0
		iface br0 inet dhcp
			bridge_ports eth0
			bridge_stp off
			bridge_fd 0
			bridge_maxwait 0
	EOF
	(rebooted)

Then I cloned two working lucid server images
	qemu-img create -f qcow2 -b s1.img s2.img
	qemu-img create -f qcow2 -b s1.img s3.img
	MACADDR1=`ifconfig br0 | head -2 | tail -1 | awk -F: '{ print $2 '}| awk '{ print $1 '}`
	MACADDR2=`ifconfig br0 | head -2 | tail -1 | awk -F: '{ print $2 '}| awk '{ print $1 '}`

I started the first with kvm:
	kvm -drive file=s2.img,if=scsi,index=0,boot=on -m 1G -smp 2 -net nic,macaddr=$MACADDR1,model=virtio -net tap,ifname=tap1,script=no,downscript=no

and hooked up its interface on the host:
	ifconfig tap1 0.0.0.0 up
	brctl addif br0 tap1
then ran dhclient on the guest.

Then I started the second host the same way (with s3.img, tap2, and
$MACADDR2).

The whole time I left a terminal open with 'ping google.com', and
never saw any hiccoughs.

Please let me know if any of this gives you an idea of what else I should
do to reproduce.

-- 
kvm images losing connectivity w/bridged network
https://bugs.launchpad.net/bugs/584048
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