This is more a bug with the kernel than bridge-utils. brctl just configures the kernel ioctls for the bridge. Same with systemd-networkd. Lodge the bug against the kernel! I have had issues with these kernel bridges, and switched to running openvswitch as that is what Open Stack uses extensively.
Regards, Matt Grant On Sun, 5 Sep 2021 13:48:16 +0200 Pieter Hollander <debian@hollander.online> wrote: > Package: bridge-utils > Version: 1.7-1 > Severity: critical > Tags: ipv6 > Justification: breaks unrelated software > > After upgrading from Buster to Bullseye, bridge-utils no longer > configures my IPv6 network bridge correctly. > It fails to bring up br0 and therefore also breaks Unbound on my system, > as the IPv6 interface address Unbound needs to bind to remains in > "tentative" state. > Looking at the bridge-utils changelog, I thought it might be related to > the fixes for #980752, but I am unsure about this. > I have personally not been able to fix the problem yet and cannot find > documentation explaining the change in bridge-utils behaviour. > > The following setup works correctly on buster but fails on bullseye. > "sudo journalctl -u networking -f" shows the following message: > > Starting Raise network interfaces... > Sep 02 12:10:30 x ifup[849]: Waiting for DAD... Done > Sep 02 12:10:37 x ifup[1042]: Waiting for DAD... Timed out > Sep 02 12:10:37 x ifup[712]: ifup: failed to bring up br0 > Sep 02 12:10:37 x systemd[1]: networking.service: Main process exited, > code=exited, status=1/FAILURE > Sep 02 12:10:37 x systemd[1]: networking.service: Failed with result > 'exit-code'. > Sep 02 12:10:37 x systemd[1]: Failed to start Raise network interfaces. > > Overview of configuration: > > /etc/network/interfaces: > > # interfaces(5) file used by ifup(8) and ifdown(8) > # Include files from /etc/network/interfaces.d: > source-directory /etc/network/interfaces.d > > auto lo > iface lo inet loopback > > auto ens3 > iface ens3 inet static > address 203.0.113.0.118 > netmask 255.255.255.0 > gateway 203.0.113.0.1 > dns-nameservers 127.0.0.1 > > iface ens3 inet6 static > address 2001:db8::1 > netmask 128 > gateway fe80::1 > dns-nameservers ::1 > > auto br0 > iface br0 inet static > address 10.10.10.1 > netmask 255.255.255.0 > bridge_ports none > bridge_stp off > bridge_fd 0
