Hi Daniel,
The error shows up whenever the bridge is defined. Enabling or disabling (even removing) the firewall does not seem to have any impact on the error message. Nevertheless, the system seems to work. Indeed, I could go without NIC bonding. On the other hand, if high availability hardware is available, one may just want to use it.
As I am in a dual SOHO situation, I tend to leave one server running with NIC bonding and one with just a single NIC connected. Then, I should be able to collect further experiences.
Would you recommend to file a bug now?
Regards,
Michael