Extra bridge interfaces get added automatically

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http://unix.stackexchange.com – I have a bridge set up between eth0 and br0, the bridge works fine, but sometimes, for unknown reasons and circumstances, I keep getting these off vethXXXXXX interfaces added to the bridge. When this happens my LXC instances can't talk to the internet. When I run brctl delif br0 vethNbUtXk && brctl delif br0 vethYqTf0F, all is well again. Any idea where these odd looking interfaces are coming from? root@ubuntuserver:/var/lib/lxc# brctl show bridge name bridge id STP enabled interfaces br0 8000.080027ca5f7a no eth0 (HowTos)