Bug#814566: marked as done (networkd >= 229-1 starts assigning IPv6 addresses/ routes to lower bridge members)

Sun, 28 Feb 2016 15:57:33 -0800 

Your message dated Sun, 28 Feb 2016 23:53:07 +0000
with message-id <[email protected]>
and subject line Bug#814566: fixed in systemd 229-2
has caused the Debian Bug report #814566,
regarding networkd >= 229-1 starts assigning IPv6 addresses/ routes to lower 
bridge members
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact [email protected]
immediately.)


-- 
814566: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=814566
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message --- 
Package: systemd
Version: 229-1
Severity: normal

Hi

After upgrading from systemd 228-6 to 229-1, I'm experiencing IPv6
connectivity issues. Debugging this shows some changes in the way 
systemd-networkd (systemd-resolved is also in use) deals with bridges
and IPv6 addresses - apparently the lower bridge members (physical 
ethernet cards) suddenly get their own IPv6 addresses/ routes assigned.
This messes up the routing table (lost packets) and also causes the 
DHCPv6 address reservations to fail/ get mis-assigned.

I have attached my networkd configuration (/etc/systemd/network/) as 
network.tar.gz; all virtual bridge member definitions (tap interfaces) 
have been removed before debugging this for clarity. systemd-networkd 
is the only active networking daemon, neither ifupdown nor 
network-manager are installed on the system(s) in question.

[ I've partially obfuscated the he.net /48 prefix with '1234' instead 
  of the real one ]

My router hands out IP addresses via DHCP (10.0.0.0/8) and DHCPv6 
(he.net tunnel 2001:470:1234:10::/64 (subset of a routed /48 prefix), 
ULA prefix fd01:470:1234:10::/64), running a recent OpenWrt trunk 
snapshot (r48686) on the ar71xx platform. There is no dhcpd/ dhcpv6d
running on the subnet connected to the br1 interface, nor any route
to the outside or any other network.

systemd 228-6:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master 
br0 state UP group default qlen 1000
    link/ether 94:de:80:02:ca:42 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::96de:80ff:fe02:ca42/64 scope link 
       valid_lft forever preferred_lft forever
3: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master 
br1 state UP group default qlen 1000
    link/ether 00:08:54:57:18:2c brd ff:ff:ff:ff:ff:ff
    inet6 fe80::208:54ff:fe57:182c/64 scope link 
       valid_lft forever preferred_lft forever
4: br1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group 
default qlen 1000
    link/ether 00:08:54:57:18:2c brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global br1
       valid_lft forever preferred_lft forever
    inet6 fe80::208:54ff:fe57:182c/64 scope link 
       valid_lft forever preferred_lft forever
5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group 
default qlen 1000
    link/ether 94:de:80:02:ca:42 brd ff:ff:ff:ff:ff:ff
    inet 10.10.20.0/8 brd 10.255.255.255 scope global dynamic br0
       valid_lft 43075sec preferred_lft 43075sec
    inet6 fd01:470:1234:10::10:2000/128 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fd01:470:1234:10:ec7c:da74:ab3e:a43/64 scope global temporary dynamic 
       valid_lft 604677sec preferred_lft 85677sec
    inet6 fd01:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
dynamic 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:ec7c:da74:ab3e:a43/64 scope global temporary dynamic 
       valid_lft 604677sec preferred_lft 85677sec
    inet6 2001:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
dynamic 
       valid_lft forever preferred_lft forever
    inet6 fe80::96de:80ff:fe02:ca42/64 scope link 
       valid_lft forever preferred_lft forever

$ ip r
default via 10.0.0.1 dev br0  proto dhcp  src 10.10.20.0  metric 1024 
10.0.0.0/8 dev br0  proto kernel  scope link  src 10.10.20.0 
10.0.0.1 dev br0  proto dhcp  scope link  src 10.10.20.0  metric 1024 
192.168.20.0/24 dev br1  proto kernel  scope link  src 192.168.20.20

$ ip -6 r
2001:470:1234:10::/64 dev br0  proto kernel  metric 256  mtu 1424 pref medium
fd01:470:1234:10::/64 dev br0  proto kernel  metric 256  mtu 1424 pref medium
fe80::/64 dev enp2s0  proto kernel  metric 256  pref medium
fe80::/64 dev br0  proto kernel  metric 256  mtu 1424 pref medium
fe80::/64 dev enp4s0  proto kernel  metric 256  pref medium
fe80::/64 dev br1  proto kernel  metric 256  pref medium
default via fe80::92f6:52ff:fef6:c88 dev br0  proto ra  metric 1024  expires 
65480sec mtu 1424 hoplimit 64 pref medium

# systemctl status -l systemd-networkd.service 
● systemd-networkd.service - Network Service
   Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; 
vendor preset: enabled)
   Active: active (running) since Sa 2016-02-13 04:22:36 CET; 3min 55s ago
     Docs: man:systemd-networkd.service(8)
 Main PID: 493 (systemd-network)
   Status: "Processing requests..."
    Tasks: 1 (limit: 512)
   CGroup: /system.slice/systemd-networkd.service
           └─493 /lib/systemd/systemd-networkd

Feb 13 04:22:41 poseidon systemd-networkd[493]: enp4s0: Gained IPv6LL
Feb 13 04:22:41 poseidon systemd-networkd[493]: enp4s0: Configured
Feb 13 04:22:41 poseidon systemd-networkd[493]: br1: Gained IPv6LL
Feb 13 04:22:41 poseidon systemd-networkd[493]: br1: Configured
Feb 13 04:22:42 poseidon systemd-networkd[493]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 04:22:42 poseidon systemd-networkd[493]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:42 poseidon systemd-networkd[493]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:46 poseidon systemd-networkd[493]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 04:22:46 poseidon systemd-networkd[493]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:46 poseidon systemd-networkd[493]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument

# journalctl -u systemd-networkd.service
-- Logs begin at Sa 2016-02-13 04:22:31 CET, end at Sa 2016-02-13 04:23:23 CET. 
--
Feb 13 04:22:36 poseidon systemd[1]: Starting Network Service...
Feb 13 04:22:36 poseidon systemd-networkd[493]: br0: netdev ready
Feb 13 04:22:36 poseidon systemd-networkd[493]: br1: netdev ready
Feb 13 04:22:36 poseidon systemd-networkd[493]: Enumeration completed
Feb 13 04:22:36 poseidon systemd[1]: Started Network Service.
Feb 13 04:22:36 poseidon systemd-networkd[493]: enp2s0: Gained carrier
Feb 13 04:22:36 poseidon systemd-networkd[493]: br0: Gained carrier
Feb 13 04:22:36 poseidon systemd-networkd[493]: br0: DHCPv4 address 
10.10.20.0/8 via 10.0.0.1
Feb 13 04:22:37 poseidon systemd-networkd[493]: br0: Gained IPv6LL
Feb 13 04:22:37 poseidon systemd-networkd[493]: br0: Configured
Feb 13 04:22:38 poseidon systemd-networkd[493]: enp2s0: Gained IPv6LL
Feb 13 04:22:38 poseidon systemd-networkd[493]: enp2s0: Configured
Feb 13 04:22:38 poseidon systemd-networkd[493]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:38 poseidon systemd-networkd[493]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:38 poseidon systemd-networkd[493]: br0: DHCPv6 address 
fd01:0470:1234:0010:0000:0000:0010:2000/128 timeout preferred -1 valid -1
Feb 13 04:22:39 poseidon systemd-networkd[493]: enp4s0: Gained carrier
Feb 13 04:22:39 poseidon systemd-networkd[493]: br1: Gained carrier
Feb 13 04:22:41 poseidon systemd-networkd[493]: enp4s0: Gained IPv6LL
Feb 13 04:22:41 poseidon systemd-networkd[493]: enp4s0: Configured
Feb 13 04:22:41 poseidon systemd-networkd[493]: br1: Gained IPv6LL
Feb 13 04:22:41 poseidon systemd-networkd[493]: br1: Configured
Feb 13 04:22:42 poseidon systemd-networkd[493]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 04:22:42 poseidon systemd-networkd[493]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:42 poseidon systemd-networkd[493]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:46 poseidon systemd-networkd[493]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 04:22:46 poseidon systemd-networkd[493]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:22:46 poseidon systemd-networkd[493]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument

systemd 229-1:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master 
br1 state UP group default qlen 1000
    link/ether 00:08:54:57:18:2c brd ff:ff:ff:ff:ff:ff
    inet6 fe80::208:54ff:fe57:182c/64 scope link 
       valid_lft forever preferred_lft forever
3: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master 
br0 state UP group default qlen 1000
    link/ether 94:de:80:02:ca:42 brd ff:ff:ff:ff:ff:ff
    inet6 fd01:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::96de:80ff:fe02:ca42/64 scope link 
       valid_lft forever preferred_lft forever
4: br1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group 
default qlen 1000
    link/ether 00:08:54:57:18:2c brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global br1
       valid_lft forever preferred_lft forever
    inet6 fe80::208:54ff:fe57:182c/64 scope link 
       valid_lft forever preferred_lft forever
5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group 
default qlen 1000
    link/ether 94:de:80:02:ca:42 brd ff:ff:ff:ff:ff:ff
    inet 10.10.20.0/8 brd 10.255.255.255 scope global dynamic br0
       valid_lft 42563sec preferred_lft 42563sec
    inet6 fd01:470:1234:10::10:2000/128 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fd01:470:1234:10:dc66:ae3c:3f5b:497f/64 scope global temporary 
dynamic 
       valid_lft 604165sec preferred_lft 85165sec
    inet6 fd01:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:dc66:ae3c:3f5b:497f/64 scope global temporary 
dynamic 
       valid_lft 604165sec preferred_lft 85165sec
    inet6 2001:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::96de:80ff:fe02:ca42/64 scope link 
       valid_lft forever preferred_lft forever

$ ip r
default via 10.0.0.1 dev br0  proto dhcp  src 10.10.20.0  metric 1024 
10.0.0.0/8 dev br0  proto kernel  scope link  src 10.10.20.0 
10.0.0.1 dev br0  proto dhcp  scope link  src 10.10.20.0  metric 1024 
192.168.20.0/24 dev br1  proto kernel  scope link  src 192.168.20.20

$ ip -6 r
2001:470:1234:10::/64 dev br0  proto ra  metric 1024  pref medium
2001:470:1234:10::/64 dev enp2s0  proto ra  metric 1024  pref medium
2001:470:1234:10::/64 dev br1  proto ra  metric 1024  pref medium
2001:470:1234:10::/64 dev enp4s0  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev br0  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev enp2s0  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev br1  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev enp4s0  proto ra  metric 1024  pref medium
fe80::/64 dev enp2s0  proto kernel  metric 256  pref medium
fe80::/64 dev br0  proto kernel  metric 256  pref medium
fe80::/64 dev enp4s0  proto kernel  metric 256  pref medium
fe80::/64 dev br1  proto kernel  metric 256  pref medium
default via fe80::92f6:52ff:fef6:c88 dev br0  proto ra  metric 1024  pref medium
default via fe80::92f6:52ff:fef6:c88 dev enp2s0  proto ra  metric 1024  pref 
medium
default via fe80::92f6:52ff:fef6:c88 dev br1  proto ra  metric 1024  pref medium
default via fe80::92f6:52ff:fef6:c88 dev enp4s0  proto ra  metric 1024  pref 
medium

● systemd-networkd.service - Network Service
   Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; 
vendor preset: enabled)
   Active: active (running) since Sa 2016-02-13 04:16:12 CET; 3min 59s ago
     Docs: man:systemd-networkd.service(8)
 Main PID: 486 (systemd-network)
   Status: "Processing requests..."
    Tasks: 1 (limit: 512)
   CGroup: /system.slice/systemd-networkd.service
           └─486 /lib/systemd/systemd-networkd

Feb 13 04:16:15 poseidon systemd-networkd[486]: enp4s0: Gained carrier
Feb 13 04:16:15 poseidon systemd-networkd[486]: br1: Gained carrier
Feb 13 04:16:16 poseidon systemd-networkd[486]: enp2s0: Configured
Feb 13 04:16:16 poseidon systemd-networkd[486]: enp4s0: Gained IPv6LL
Feb 13 04:16:17 poseidon systemd-networkd[486]: br1: Gained IPv6LL
Feb 13 04:16:17 poseidon systemd-networkd[486]: br0: Configured
Feb 13 04:16:29 poseidon systemd-networkd[486]: enp4s0: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 04:16:29 poseidon systemd-networkd[486]: enp4s0: Configured
Feb 13 04:16:29 poseidon systemd-networkd[486]: br1: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 04:16:29 poseidon systemd-networkd[486]: br1: Configured

# journalctl -u systemd-networkd.service 
-- Logs begin at Sa 2016-02-13 04:16:07 CET, end at Sa 2016-02-13 04:17:01 CET. 
--
Feb 13 04:16:12 poseidon systemd[1]: Starting Network Service...
Feb 13 04:16:12 poseidon systemd-networkd[486]: br0: netdev ready
Feb 13 04:16:12 poseidon systemd-networkd[486]: br1: netdev ready
Feb 13 04:16:12 poseidon systemd-networkd[486]: Enumeration completed
Feb 13 04:16:12 poseidon systemd[1]: Started Network Service.
Feb 13 04:16:12 poseidon systemd-networkd[486]: enp2s0: Gained carrier
Feb 13 04:16:12 poseidon systemd-networkd[486]: br0: Gained carrier
Feb 13 04:16:12 poseidon systemd-networkd[486]: br0: DHCPv4 address 
10.10.20.0/8 via 10.0.0.1
Feb 13 04:16:14 poseidon systemd-networkd[486]: enp2s0: Gained IPv6LL
Feb 13 04:16:14 poseidon systemd-networkd[486]: br0: Gained IPv6LL
Feb 13 04:16:14 poseidon systemd-networkd[486]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:16:15 poseidon systemd-networkd[486]: br0: DHCPv6 address 
fd01:0470:1234:0010:0000:0000:0010:2000/128 timeout preferred -1 valid -1
Feb 13 04:16:15 poseidon systemd-networkd[486]: enp4s0: Gained carrier
Feb 13 04:16:15 poseidon systemd-networkd[486]: br1: Gained carrier
Feb 13 04:16:16 poseidon systemd-networkd[486]: enp2s0: Configured
Feb 13 04:16:16 poseidon systemd-networkd[486]: enp4s0: Gained IPv6LL
Feb 13 04:16:17 poseidon systemd-networkd[486]: br1: Gained IPv6LL
Feb 13 04:16:17 poseidon systemd-networkd[486]: br0: Configured
Feb 13 04:16:29 poseidon systemd-networkd[486]: enp4s0: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 04:16:29 poseidon systemd-networkd[486]: enp4s0: Configured
Feb 13 04:16:29 poseidon systemd-networkd[486]: br1: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 04:16:29 poseidon systemd-networkd[486]: br1: Configured

There is one potentially uncommon part of my systemd-networkd 
configuration, I'm hardcoding the MAC address of the bridge (br0/ br1)
to the MAC address of the underlying physical network card (br0 gets
assigned the same MAC address as its bridge member enp2s0). I do this
in order to always get the same IPv4/ IPv6 addresses via its static
DHCP/ DHCPv6 lease and its associated DNS entries, regardless of the OS
or configuration being started. However changing this for testing 
(incrementing the bridge's MAC address by 1) doesn't show any change in 
behaviour.

systemd 229-1 with different/ incremented MAC addresses:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master 
br1 state UP group default qlen 1000
    link/ether 00:08:54:57:18:2c brd ff:ff:ff:ff:ff:ff
    inet6 fd01:470:1234:10:208:54ff:fe57:182c/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:208:54ff:fe57:182c/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::208:54ff:fe57:182c/64 scope link 
       valid_lft forever preferred_lft forever
3: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master 
br0 state UP group default qlen 1000
    link/ether 94:de:80:02:ca:42 brd ff:ff:ff:ff:ff:ff
    inet6 fd01:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:96de:80ff:fe02:ca42/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::96de:80ff:fe02:ca42/64 scope link 
       valid_lft forever preferred_lft forever
4: br1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group 
default qlen 1000
    link/ether 00:08:54:57:18:2d brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global br1
       valid_lft forever preferred_lft forever
    inet6 fd01:470:1234:10:208:54ff:fe57:182d/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:208:54ff:fe57:182d/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::208:54ff:fe57:182d/64 scope link 
       valid_lft forever preferred_lft forever
5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group 
default qlen 1000
    link/ether 94:de:80:02:ca:43 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.179/8 brd 10.255.255.255 scope global dynamic br0
       valid_lft 42452sec preferred_lft 42452sec
    inet6 fd01:470:1234:10::f14/128 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fd01:470:1234:10:a81f:51eb:3b60:442/64 scope global temporary dynamic 
       valid_lft 604051sec preferred_lft 85051sec
    inet6 fd01:470:1234:10:96de:80ff:fe02:ca43/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 2001:470:1234:10:a81f:51eb:3b60:442/64 scope global temporary dynamic 
       valid_lft 604051sec preferred_lft 85051sec
    inet6 2001:470:1234:10:96de:80ff:fe02:ca43/64 scope global mngtmpaddr 
noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::96de:80ff:fe02:ca43/64 scope link 
       valid_lft forever preferred_lft forever

$ ip r
default via 10.0.0.1 dev br0  proto dhcp  src 10.0.0.179  metric 1024 
10.0.0.0/8 dev br0  proto kernel  scope link  src 10.0.0.179 
10.0.0.1 dev br0  proto dhcp  scope link  src 10.0.0.179  metric 1024 
192.168.20.0/24 dev br1  proto kernel  scope link  src 192.168.20.20 

$ ip -6 r
2001:470:1234:10::/64 dev br0  proto ra  metric 1024  pref medium
2001:470:1234:10::/64 dev enp4s0  proto ra  metric 1024  pref medium
2001:470:1234:10::/64 dev br1  proto ra  metric 1024  pref medium
2001:470:1234:10::/64 dev enp2s0  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev br0  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev enp4s0  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev br1  proto ra  metric 1024  pref medium
fd01:470:1234:10::/64 dev enp2s0  proto ra  metric 1024  pref medium
fe80::/64 dev enp2s0  proto kernel  metric 256  pref medium
fe80::/64 dev br0  proto kernel  metric 256  pref medium
fe80::/64 dev enp4s0  proto kernel  metric 256  pref medium
fe80::/64 dev br1  proto kernel  metric 256  pref medium
default via fe80::92f6:52ff:fef6:c88 dev br0  proto ra  metric 1024  pref medium
default via fe80::92f6:52ff:fef6:c88 dev enp4s0  proto ra  metric 1024  pref 
medium
default via fe80::92f6:52ff:fef6:c88 dev br1  proto ra  metric 1024  pref medium
default via fe80::92f6:52ff:fef6:c88 dev enp2s0  proto ra  metric 1024  pref 
medium

# systemctl status -l systemd-networkd.service
● systemd-networkd.service - Network Service
   Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; 
vendor preset: enabled)
   Active: active (running) since Sa 2016-02-13 03:37:26 CET; 32min ago
     Docs: man:systemd-networkd.service(8)
 Main PID: 487 (systemd-network)
   Status: "Processing requests..."
    Tasks: 1 (limit: 512)
   CGroup: /system.slice/systemd-networkd.service
           └─487 /lib/systemd/systemd-networkd

Feb 13 03:37:43 poseidon systemd-networkd[487]: br1: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 03:37:43 poseidon systemd-networkd[487]: br1: Configured
Feb 13 03:37:43 poseidon systemd-networkd[487]: enp4s0: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 03:37:43 poseidon systemd-networkd[487]: enp4s0: Configured
Feb 13 03:41:54 poseidon systemd-networkd[487]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 03:41:54 poseidon systemd-networkd[487]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 03:41:54 poseidon systemd-networkd[487]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:09:31 poseidon systemd-networkd[487]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:09:31 poseidon systemd-networkd[487]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 04:09:31 poseidon systemd-networkd[487]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument

# journalctl -u systemd-networkd.service
-- Logs begin at Sa 2016-02-13 03:37:21 CET, end at Sa 2016-02-13 04:09:31 CET. 
--
Feb 13 03:37:26 poseidon systemd[1]: Starting Network Service...
Feb 13 03:37:26 poseidon systemd-networkd[487]: br0: netdev ready
Feb 13 03:37:26 poseidon systemd-networkd[487]: br1: netdev ready
Feb 13 03:37:26 poseidon systemd-networkd[487]: Enumeration completed
Feb 13 03:37:26 poseidon systemd-networkd[487]: enp2s0: Gained carrier
Feb 13 03:37:26 poseidon systemd-networkd[487]: br0: Gained carrier
Feb 13 03:37:26 poseidon systemd[1]: Started Network Service.
Feb 13 03:37:28 poseidon systemd-networkd[487]: br0: Gained IPv6LL
Feb 13 03:37:28 poseidon systemd-networkd[487]: enp2s0: Gained IPv6LL
Feb 13 03:37:29 poseidon systemd-networkd[487]: br0: DHCPv6 address 
fd01:0470:1234:0010:0000:0000:0000:0f14/128 timeout preferred -1 valid -1
Feb 13 03:37:29 poseidon systemd-networkd[487]: br0: DHCPv4 address 
10.0.0.179/8 via 10.0.0.1
Feb 13 03:37:29 poseidon systemd-networkd[487]: enp4s0: Gained carrier
Feb 13 03:37:29 poseidon systemd-networkd[487]: br1: Gained carrier
Feb 13 03:37:30 poseidon systemd-networkd[487]: br1: Gained IPv6LL
Feb 13 03:37:30 poseidon systemd-networkd[487]: enp4s0: Gained IPv6LL
Feb 13 03:37:31 poseidon systemd-networkd[487]: br0: Configured
Feb 13 03:37:40 poseidon systemd-networkd[487]: enp2s0: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 03:37:40 poseidon systemd-networkd[487]: enp2s0: Configured
Feb 13 03:37:43 poseidon systemd-networkd[487]: br1: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 03:37:43 poseidon systemd-networkd[487]: br1: Configured
Feb 13 03:37:43 poseidon systemd-networkd[487]: enp4s0: Starting DHCPv6 client 
after NDisc timeout failed: Invalid argument
Feb 13 03:37:43 poseidon systemd-networkd[487]: enp4s0: Configured
Feb 13 03:41:54 poseidon systemd-networkd[487]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 03:41:54 poseidon systemd-networkd[487]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 03:41:54 poseidon systemd-networkd[487]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:09:31 poseidon systemd-networkd[487]: enp4s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument
Feb 13 04:09:31 poseidon systemd-networkd[487]: br1: Starting DHCPv6 client on 
NDisc request failed: Invalid argument
Feb 13 04:09:31 poseidon systemd-networkd[487]: enp2s0: Starting DHCPv6 client 
on NDisc request failed: Invalid argument

The lower (physical-) bridge members only get their IPv6 addresses
after a couple of minutes, immediately after rebooting it's still all
fine; this attached configuration has been working well for me for
many months before. I see this behaviour on multiple systems, all
with very similar configurations (most with more than just two 
physical/ independent subnets (no interconnections) and typically 
with 15-20 tap interfaces used for virtual (kvm) machines).

I can reproduce this with src:systemd 229-1, reverting all installed 
src:systemd packages to 228-6 fixes the issue again.

Regards
        Stefan Lippers-Hollmann

-- Package-specific info:

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.4.0-1.slh.1-aptosid-amd64 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.113+nmu3
ii  libacl1         2.2.52-3
ii  libapparmor1    2.10-3
ii  libaudit1       1:2.4.5-1
ii  libblkid1       2.27.1-3
ii  libc6           2.21-7
ii  libcap2         1:2.24-12
ii  libcap2-bin     1:2.24-12
ii  libcryptsetup4  2:1.7.0-2
ii  libgcrypt20     1.6.4-5
ii  libgpg-error0   1.21-1
ii  libkmod2        22-1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.27.1-3
ii  libpam0g        1.1.8-3.2
ii  libseccomp2     2.2.3-2
ii  libselinux1     2.4-3
ii  libsystemd0     229-1
ii  mount           2.27.1-3
ii  util-linux      2.27.1-3

Versions of packages systemd recommends:
ii  dbus            1.10.6-1
ii  libpam-systemd  229-1

Versions of packages systemd suggests:
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
ii  udev  229-1

-- no debconf information

Attachment: network.tar.gz
Description: application/gzip

Attachment: pgpaEvFXsUlh6.pgp
Description: Digitale Signatur von OpenPGP


--- End Message ---
--- Begin Message --- 
Source: systemd
Source-Version: 229-2

We believe that the bug you reported is fixed in the latest version of
systemd, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Martin Pitt <[email protected]> (supplier of updated systemd package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Sun, 28 Feb 2016 22:16:12 +0100
Source: systemd
Binary: systemd systemd-sysv systemd-container systemd-journal-remote 
systemd-coredump libpam-systemd libnss-myhostname libnss-mymachines 
libnss-resolve libsystemd0 libsystemd-dev udev libudev1 libudev-dev udev-udeb 
libudev1-udeb systemd-dbg
Architecture: source amd64
Version: 229-2
Distribution: unstable
Urgency: medium
Maintainer: Debian systemd Maintainers 
<[email protected]>
Changed-By: Martin Pitt <[email protected]>
Description:
 libnss-myhostname - nss module providing fallback resolution for the current 
hostname
 libnss-mymachines - nss module to resolve hostnames for local container 
instances
 libnss-resolve - nss module to resolve names via systemd-resolved
 libpam-systemd - system and service manager - PAM module
 libsystemd-dev - systemd utility library - development files
 libsystemd0 - systemd utility library
 libudev-dev - libudev development files
 libudev1   - libudev shared library
 libudev1-udeb - libudev shared library (udeb)
 systemd    - system and service manager
 systemd-container - systemd container/nspawn tools
 systemd-coredump - tools for storing and retrieving coredumps
 systemd-dbg - system and service manager (debug symbols)
 systemd-journal-remote - tools for sending and receiving remote journal logs
 systemd-sysv - system and service manager - SysV links
 udev       - /dev/ and hotplug management daemon
 udev-udeb  - /dev/ and hotplug management daemon (udeb)
Closes: 814566 814667 815020 815586 815793 815884 816132
Changes:
 systemd (229-2) unstable; urgency=medium
 .
   * time-util: map ALARM clockids to non-ALARM clockids in now(), to work on
     architectures which don't support CLOCK_BOOTTIME_ALARM. Fixes FTBFS on
     many architectures.
   * debian/systemd.postinst: Add missing newline to /etc/adjtime migration.
     (See #699554)
   * debian/systemd.postinst: Only try to enable tmp.mount if we actually
     copied it to /etc. Don't try to enable a generated unit. (LP: #1545707)
   * debian/tests/boot-and-services: Increase timeouts of test_bash_crash from
     5 to 10 seconds, and sync the journal after every iteration.
   * debian/extra/checkout-upstream: Try again after one minute if git checkout
     fails, to avoid failures from transient network errors.
   * debian/tests/systemd-fsckd: Use grub.d/50-cloudimg-settings.cfg as a
     template for generating our custom one instead of 90-autopkgtest.cfg. The
     latter does not exist on non-x86 architectures and is not relevant for
     this test.
   * debian/tests/boot-and-services: Skip journal test for test_bash_crash when
     running against upstream, as this currently fails most of the time. To be
     investigated.
   * debian/tests/networkd: Skip test_coldplug_dhcp_ip6 when running against
     upstream, as this is brittle there. To be investigated.
   * debian/tests/bootchart: Skip test if bootchart is not available or
     testing in upstream mode. bootchart got removed from master and will be
     moved to a separate repository.
   * debian/tests/boot-and-services: Show verbose journal output on failure in
     nspawn test, and sync journal before.
   * Move systemd-coredump socket and service into systemd-coredump binary
     package.
   * Revert changing the default core dump ulimit and core_pattern. This
     completely breaks core dumps without systemd-coredump. It's also
     contradicting core(8). (Closes: #815020)
   * Fix addresses for type "sit" tunnels. (Closes: #816132)
   * networkd: Go back to letting the kernel handle IPv6 router advertisements,
     as networkd's own currently has too many regressions. Thanks to Stefan
     Lippers-Hollmann for investigating this! (Closes: #814566,
     #814667, #815586, #815884, #815793)
Checksums-Sha1:
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libnss-mymachines_229-2_amd64.deb
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Checksums-Sha256:
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libnss-resolve_229-2_amd64.deb
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libpam-systemd_229-2_amd64.deb
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Files:
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systemd_229-2.debian.tar.xz
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libnss-myhostname_229-2_amd64.deb
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libnss-mymachines_229-2_amd64.deb
 73865f1584f7f04637cd2a1a14712703 164916 admin extra 
libnss-resolve_229-2_amd64.deb
 0d21cebf41341ca0cfea94738ac71188 167540 admin optional 
libpam-systemd_229-2_amd64.deb
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libsystemd0_229-2_amd64.deb
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libudev-dev_229-2_amd64.deb
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libudev1-udeb_229-2_amd64.udeb
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 0730ebcfc900fb78ca0f2c5313b4d6c5 701838 admin optional 
systemd-container_229-2_amd64.deb
 4b065b2dd1afc5b2a82d9fc315c482d4 159860 admin optional 
systemd-coredump_229-2_amd64.deb
 c3be434bba6294a9804278e75aa0d828 30101104 debug extra 
systemd-dbg_229-2_amd64.deb
 c89236988e34098d4f64a521e007c550 315850 admin optional 
systemd-journal-remote_229-2_amd64.deb
 66a6af89c2bd9a096854f118940c9b4d 61742 admin important 
systemd-sysv_229-2_amd64.deb
 9afccd1cacd1b1c25ee625110c374631 3654292 admin important 
systemd_229-2_amd64.deb
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udev-udeb_229-2_amd64.udeb
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Package-Type: udeb

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--- End Message ---
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