This is a regression on iptables 1.4.12 (the one in precise) not allowing to invert options like ! --physdev-is-bridged. This affects at least zentyal-network, as it introduces these kind of rules when configuring a bridged network interface.
This is already fixed in 1.4.13. Also, you can find attached the patch extracted from the iptables GIT repository.
This is a regression on iptables 1.4.12 (the one in precise) not allowing to invert options like ! --physdev- is-bridged. This affects at least zentyal-network, as it introduces these kind of rules when configuring a bridged network interface.
This is already fixed in 1.4.13. Also, you can find attached the patch extracted from the iptables GIT repository.