VM networking stops working

[Mike <mike-kcIQ9yavhvsV/sYkb9DZNQ@public.gmane.org>]

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Hello,
I have a problem with my virtual machines. I am using kvm53
on an AMD Athlon(tm) 64 X2 Dual Core Processor 5000+.
As distribution I use Ubuntu server 7.10.
As kernel I use Linux 2.6.22-14-server #1 SMP Sun Oct 14 22:09:15 GMT 
2007 x86_64 GNU/Linux.

I have 3 different vms running. At the beginning they all work without a 
problem.
Then, after one moment to another one or more stop working.
I did a ping test to all the machines, the vm with the failure stops 
pinging.
The result from external ping: Destination host unreachable.
The same result from a ping onto the main server.

Here are my configuration files:
cat /etc/qemu-ifup
#!/bin/sh
/sbin/ifconfig $1 0.0.0.0 promisc up
/usr/sbin/brctl addif br0 $1
sleep 2
------------------------------------------------------------------------
cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto br0
iface br0 inet static
address 195.24.77.169
netmask 255.255.255.0
gateway 195.24.77.1
bridge_ports eth0
bridge_stp off
bridge_maxwait 5
------------------------------------------------------------------------
I use scripts for starting the vms:
kvm -hda apache.img -hdb apache_storage.img -m 512 -boot c -net 
nic,vlan=0,macaddr=00:16:3e:00:00:01 -net tap -nographic -daemonize
kvm -hda postfix.img -m 512 -boot c -net 
nic,vlan=0,macaddr=00:16:3e:00:00:12 -net tap -nographic -daemonize
kvm -hda openvpn.img -m 256 -boot c -net 
nic,vlan=0,macaddr=00:16:3e:00:00:03 -net tap -nographic -daemonize
------------------------------------------------------------------------
The tapN devices are being created at the startup of the vms.

When I run dmesg I have this:
[  112.390943] br0: port 2(tap1) entering learning state
[  112.391919] br0: port 3(tap0) entering learning state
[  112.397605] br0: port 4(tap2) entering learning state
[  122.674313] tap0: no IPv6 routers present
[  122.729185] tap1: no IPv6 routers present
[  122.843901] tap2: no IPv6 routers present
[  123.336081] kvm: emulating exchange as write
[  127.367940] br0: topology change detected, propagating
[  127.367949] br0: port 4(tap2) entering forwarding state
[  127.362971] br0: topology change detected, propagating
[  127.362977] br0: port 2(tap1) entering forwarding state
[  127.362978] br0: topology change detected, propagating
[  127.362980] br0: port 3(tap0) entering forwarding state

No indication of a problem, nowhere in the log files.

I don't know if the vms are freezing, or the network forwarding stops 
working.
I also activated "net.ipv4.conf.default.forwarding=1"

I googled days for that problem, but without a result.
I hope that maybe you have a solution for this problem. That would be 
great, because I prefer using kvm instead of other virtualization systems.

Thank you very much in advance,
Greetings from Luxembourg.

Have a nice day,
Mike


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