It seems to me it is a Debian Squeeze bug, see for example here, also for a workaround:
http://wiki.debian.org/BridgeNetworkConnections Strange enough... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/50093 Title: Some sysctl's are ignored on boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/50093/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs