https://bugzilla.novell.com/show_bug.cgi?id=821879 https://bugzilla.novell.com/show_bug.cgi?id=821879#c23 --- Comment #23 from Bernhard Wiedemann <bwiedemann@suse.com> 2013-05-31 17:06:56 CEST --- after reading linux/net/bridge/br_forward.c should_deliver function I finally managed to track it down to the "hairpin_mode" causing the trouble and it turns out that other people also hit this: https://bugs.launchpad.net/nova/+bug/1011134 so we really have 3 bugs: 1. VM interfaces on compute-hosts of SUSE Cloud 1.0 / OpenStack have hairpin_mode on, making them receive back their own traffic 2. with the Host's bridge treating multicast like broadcast, VM's Linux IPv6 duplicate address detection receives its own sent packet and assumes some other host is using the same addr 3. 12.3's systemd assumes this means a failure in the network script and on udev upgrade the network is killed Steps to Reproduce: have a br0 with tap0 enslaved echo 1 > /sys/class/net/br0/brif/tap0/hairpin_mode qemu-kvm -net nic,macaddr=56:00:56:76:54:32 -net tap,ifname=tap0,script=no,downscript=no -m 1000 -hda test.img -monitor stdio -vnc :9 and that still happens with a 12.3 Host and 3.7.10 kernel -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.