I was running into a bunch of problems with KVM bridging and Ubuntu Bonding (LACP) but I was able to resolve this by using the following network config:
Printout from /etc/network/interfaces
# 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
iface lo inet loopback
# Child Networking interfaces
iface eth0 inet manual
iface eth1 inet manual
#Bond mode load-balancing LACP fast
iface bond0 inet manual
bond-slaves eth0 eth1
#Bridged networking interfaces
iface br0 inet static
# dns-* options are implemented by the resolvconf package, if installed
Have you ever needed to run an MTR, (basically a traceroute) and save it to a file and then delete the files after a specified amount of time? I have had this need so I wrote this simple Ruby Script available on GITHUB.