Bug#924349: linux-image-4.19.0-2-amd64: IPv6 reverse path filtering incorrectly removes IPv6 traffic from bridge
On Mon, Mar 11, 2019 at 10:43:48PM +0100, Ralf Jung wrote:
> Package: src:linux
> Version: 4.19.16-1
> Severity: normal
> Dear Maintainer,
> since a recent update, IPv6 communication between two of my VMs stopped working.
> You can see some of the debugging effort at
> <https://bugzilla.redhat.com/show_bug.cgi?id=1680681>. It turned out that
> setting IPv6_rpfilter=no in /etc/firewalld/firewalld.conf fixes the problem---so
> the ip6tables reverse path filtering is incorrectly dropping packets here.
> A self-compiled upstream 4.20.14 kernel does not show this problem, but the
> latest kernel in testing still does.
have you tried to isolate the fixing commit for this issue?